Dual .21 Touring Car *ARMAGEDDON*

[CrazyPhantom]

Hello,

I have been working on my Dual Hyper .21 touring car (1/10 scale) for a while now and have decided to show everyone. The latest pictrues dont show the motor or the real chassis ( real chassis: I will be gettign a Carbon fiber one, and a Titanium one) The motors are currently being modded by EB MODS (http://www.ebmods.com) I also have connected a a older picture to show the 2 Nitro motors. The car is using rear tires off of a 1/10 scale pan car, and 30mm front tires. It is using Traxxas T-maxx F/R Differentials and an Ofna Buggy center Diff. I will also be using RC ALLOY (http://www.rcalloys.com) Driveshafts. A bunch of other stuff to list. I have a website CRAZY PHANTOM (http://www.crazyphantom.com) that I basically started for this car but hae other plans with it, you can go to projects and check out project ARMAGEDDON.

Here are some pictures.

Newer One:
http://img.photobucket.com/albums/v417/Area51Project/New6.jpg

Older One:
http://img.photobucket.com/albums/v417/Area51Project/Final.jpg

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[studysession]

Looks cool.

[ducati777]

You look to be off to a great start. Sound idea, and good layout. A couple things jump to mind....

First off is wheelbase, why not go longer? At higher speeds I'd think you'd want to be nice and long, and considering you get a 40 inch limit, stretch that sucks out a bit.

In addition to better handling, you'll also get better aero dynamics. With the short package you have now, I don't see it being very streamlined.

Otherwise, nice work!

[ducati777]

Err couple more ideas... gearing. Have you calc'd out what your gearing should be? If not I'd be happy to help, I need tire diameter, gear ratio, and expected rpm of the motor, remember this should be under load, so look at the dyno graphs to see where peak power is. I'm betting around 30k rpm, my old 4 port hypers seemed to like 28k under load...

Nother idea, switch those clutch shoes around to leading edge, you'll want a solid engagement at speed. Hate to see you hit 90 mph and the clutch starts slipping.

Also might want to test your wheels... see if they can handle the rpms for 120ish mph. Be happy to tell you the rpm if I knew their diameter. Course this is all pretty straight forward math, just things I bet you've already considered.

[CrazyPhantom]

Hey,

Im working on getting a custom center tranny made so that it can hodl a 36t gear allowing the gear ratio to be at exactly 2:1 from motor to tranny. I will tel lyou the RPM's and stuff later.

Ducati, I wanted to leave the car at 1/10 scale size. I dotn really want to adjust it at all, after teh race, (if still together,) It will be a show car/shelf queen.Thanks for the clutch idea, When I get the car started and running and break in done, Im goign to buy some aluminum clutch shoes

Thanks,
Joe

[ducati777]

Joe,

You're car is really off to a great start. But shelf queen??? GARGH!! I just hate to think of it sitting on a shelf.

But 2:1 from motor to diffs, then diffs are probably around 3:1 leaves you at 6:1 overall.... Err bad news.

Okay here's a lil math, you can double check.

IF:
RPM=28,000
Wheel diameter = 2.5 inches (guess)
Then overall gear ratio to reach 120 mph is only 1.734....

If we go with 6:1 ratio like above, you'll hit 34 mph. But 1.734 is a tall order, even if you gear directly to the diffs, you won't make it. Easiest thing to do is increase tire diameter... At a 6:1 ratio using 8th scale buggy tires that are 5.5 inches tall, you can hit 76 MPH.

[CrazyPhantom]

Hello,

The motors will be putting out 38k RPM's, these motors are getting modded adding a couple of more RPMS, the tires are about 2 inches in diameter. And all the diffs will be locked. Help me out and find what the top speed will be now.

thanks,
Joe

[ducati777]

Easy enough. When you say locked diffs, you mean spooled. I'm talking about their internal ratio, which on most is between 2:1 to 3:1. Take one of your diffs and turn the input shaft and see how many times you have to turn it to turn the wheels once. Or if you want to be perfectly accurate, count the teeth on the pinion and the ring gear.

Hmmm maybe I can look up the ratios...

[ducati777]

Check it out, if you use a 1:1 off the motor, meaning your clutch has as many teeth as your spur, you'll only get to 80 mph.

38,000 R's per minute means
2,280,000 per hour
devide by 2.85, your internal diff ratio leaves
800,000 rotations of the tire per hour

2 inch tire travels 6.28 inchs per roll, or 5,026,548.25 inches per hour
devide by 12 is 418,879.02 feet per hour, devide by 5280 leaves 79.33 mph.

[rc10gtisthebest]

One high RPM engine would be better for high speed purposes.

Unless your doing this for another reason?

-Todd

[ducati777]

Todd I think you can see that no motor is going to put out the revs needed to be competitive.

I've got an idea to solve the gearing problem, but you'll lose your front wheel drive.... You simply lock the front output on the center diff to the car. The diff will then double the output rpm on the rear, which will get you closer. Using a 32 tooth clutchbell, 42 tooth spur, and locking the front output shaft, you'll hit 122 mph, which is about where you should be aiming.

[rc10gtisthebest]

ducati, I see what you are saying, but I don't get how locking the front will double the RPM's going to the rear end.

BTW- I had a RWD .25 1/8 On Road racer which had a locked rearend. Let me tell you this, it DID NOT track straight, even idiling ;)

-Todd

[Toyotatogo]

I like it ..... dual .21 engines .......

Why not dual JP FX .21 Engines ..... lol $750.00 a piece though, but I hear they're screamers !!!!!!

[CrazyPhantom]

I dont understand how locking from will double to back either, and also, they dont make 32 tooth cluchbells for bigblock motors, unless some on wants to make me some.
And when I mean locked, I mean like the internal gears wont turn at all, they will be "LOCKED" in place and the spur gear will only be spinning. Tell me if you dont understand.

[ducati777]

No, I get it, you're talking about spooling your rear diff....Thats not what I'm talking about.

Okay watch this, go grab an rc car with an open, freely turning diff in it. Hold 1 tire still, and hit the gas. What happened? The diff let the other wheel spin, but it didn't just spin, it spun twice as fast as it would have if you didn't hold the other tire. Go ahead and let go of the tire, and the one you are holding will gain speed, and the other side will lose speed until they are turning at equal rates....

Okay, you're using a center drive out of an 8th scale buggy, that has a diff inside it. I want you to use this same technique, hold one side still and the diff will unload to the other side, and doulbe the speed. Thus if you take the drive cup that was going to go to the front diff, and lock it to the chasis so it can't turn, the center diff will unload on the other side.

On the other side, is the dogbone going to the rear diff, and its now being forced to turn at twice the speed....

If you really want to see this action at work, find a car with 3 diffs in it, and hold 3 wheels still. If the car normally went 20 mph, you've now doubled the output speed twice, and the 1 free wheel will turn at 80 mph! The Ofna P10.21 is perfect for this experiment, but anything with 3 diffs will do it.

[rc10gtisthebest]

I am still not a 100% sure on whether it actually doubles.. Would need some kind of proffesional opinion...

However, if you do this, have fun trying to keep the spider gears inside the diff alive. Let alone with two engines. :)

-Todd

[studysession]

Main thing it will give hime more torque and acceleration. Not top end.

[rcboy201]

the more torque u have the higher u can gear it

[CrazyPhantom]

Hello,

The center diff will be packed with hot glue, making it LOCKED, not alowing the internal gears of the diff to turn, the front/rear diffs will be spooled.

[rcboy201]

what dont u just spool it so u dont ruin a good diff

[CrazyPhantom]

How could I spool it?

[BrushlessHawaii]

Spooling your Diffs is gonna make the car push and steer badly. just so you know.

It's just like putting a locker in a 4x4. I had one in my jeep wrangler and one in my tmaxx the characteristics were the same. If your going for straight line speed cool. But I believe your gonna need to turn.

[BrushlessHawaii]

also - with locking one side of the diff down - I would experiment with this. and try both sides. Like some Go-Karts with single side drive - they steer better in certain directions. so if you know your gonna be doing left turns try locking one side at a time and see which gives you better turning results.

[ducati777]

It absolutely doubles the output speed, try it and count by hand. No professional needed.

Spool all you want man, but the simple fact remains your current setup does not allow gearing to make you competitive. Its a great car, and it will be a lot of fun to drive, but its no 100mph car. If your goal is to make a top speed car, you're going to have to face the music and redesign.

-Ducati.

[CrazyPhantom]

Yes i know, Im trying to get a new center diff desinged which it will only be a spur gear(36t) also trying to find some on that would be able to amke custom clutchbells that allow me to run more teeth on the clutchbell, still got a while, so i have time to figure out all the gearing.

[ducati777]

Well best of luck man. But you'll need a clutchbell thats BIGGER than the spur in this design to get you over 100 mph. That means you're motors will have to be mounted probably an inch taller to clear the gigantic clutchbell gear.

I'm tellin you, bigger tires man. 2 inch tall tires just require too many RPM to get up to speed. Drop some 8th scale buggy tires into your design, and we'll have you over 100 mph in a heartbeat. Even in the RCCA article gearing was the biggest problem. Dood needed custom bells and pulleys machined to get the gearing high enough. He only hit 102, using much larger tires than you.

Now if you're willing to be truely cutting edge, and you want to keep those 2 .21's and the small tires, its time to think hybrid time. An electric motor can double as a generator, and if you use an electric motor hooked to the .21, and use a motor with a different number of turns hooked directly to the diff inputs, we can get you the RPMS you need.

Your car would become a miniature freight train, using internal combustion motors to drive generators to drive electric drive motors... cool eh?

[rc10gtisthebest]

Ducati, what do you think the guys an engineer? LOL. The train thing is a bit much, I say use larger wheels.

-Todd

[studysession]

No need to keep beating him down. I think he has a great idea. And if he is able to pull it off, good for him.

[CrazyPhantom]

Hello,
I just received my new remote today, I was wondering if any one has an Jr Racing XR3 remote, I'm in need of a manual for the remote.Also, I might be saving up to get some RB S7 motors later before the challenge for performance on just a better motor. If anyone know the specs for that motor ( RPM's, HP, and stuff like that) let me know, Also, I will try to get some 1/8 scale buggy tires to try out for different speeds. So if I had a 4 inch tire, it would be faster then a 2 inch tire?

[rpmmaxxed]

Much faster.

[ducati777]

Okay, if I came off harsh, i didn't mean it, and I apologize. I'm just trying to make sure you come at this in a practical fashion. It would seem to me you should set a goal, and then design towards that goal. In my mind, 120 mph is a good goal, and I firmly believe you have the HP to do it. I think 4wd, dual .21's is a perfect setup. I'm just tryin to help with the math side of it. If you have different goals in mind, lemme know and I'll help you reach them.

But yes, if you used tires that were 4 inches tall, it would solve a lot of gearing issues.

[rc10gtisthebest]

Nor was I trying to debase him. I apologize for this. It's just so hard to show what you mean when no one can see facial expressions and body language.

Anyways, I just do not feel that two engines that were designed more for buggies will give you enough RPMs to get to your goal of 120mph.

-Todd

[LLLosingit]

Here's something to consider when picking your tires, Depending on the tire you will get a certian ammount of growth at higher RPMs. If you watch a top fuel car the tires start out low and wide as they pick up speed they become tall and skinny, this is by design and is figured into the final gear ratio.
Look at as free torque at low rpms and more speed at higher RPM's.
I'm not sure what tire will hold up at over 100mph though?

[mugenX5]

How about an Ofna 2 speed center diff, or Kyosho 3 speed center diff?
I don't think you'll reach those speeds with one single ratio .

One other thing, those Tmaxx diffs will blow up at such high speeds.

Would you be able to attain the rpm's that you want out of a smaller engine such as a .18 or .12 racing engine?

Anyhow, good luck.

[uncle_jo3]

My Only Question Is On The Motor Pics Were Are The Carbs? =)

[studysession]

His pics ar enot of a completed car yet. I am sure he just set the motors in place for planning. From the pictures you can see it is not all assembled.

[Tim'sLosi]

Check out this Savage (http://forum.maxxtraxxusa.com/showthread.php?t=4797&highlight=twin+wasp) with twin wasp .21 engines. They are layed over on their sides so that there is a head sticking out either side of the truck. This would be a much better layout for a touring car so as to keep the CG low. Just a thought! TT

[kastcreations]

Wow pretty nice set up! I would like to see how this goes....

[CrazyPhantom]

Thanks guys, I havent had much tiem to check on forum since my computer got scrude up. I will get soem updates to you guys soon, ANY ONE HAVE A JR RACING XR3 MANUAL THEU WOULD B ABLE TO COPY FOR SOME $$?

[Tim'sLosi]

XR3i Manual [JRPM127]
by JR in Replacement Radio Parts

Our Price: $3.95

[CrazyPhantom]

XR3i Manual [JRPM127]
by JR in Replacement Radio Parts

Our Price: $3.95


I have the XR3, not XR3i, does it make a difference?

[thefasttrack]

thats gonna flex like the first act of the circus

[CrazyPhantom]

Fasttrack, how do you think it is going to flex?

[OptimaMan]

Hey, just use 3 inch tires. That 80 becomes more like 120 then. Or, use 4 inch tires and theoretical becomes more like 160 mph (of course, drag, and friction will probably drop it down substantially)

That's a good idea. Get 4 inch tires and measure speed. Grind them down a little and measure speed. Keep on doing it and eventually, when you graph out the speeds vs. tire diameter, you'll find the optimum tire diameter. However, if the graph never actually rises, then you need to go to bigger tires or find a pinion that's larger than the spur gear. Actually, 4 inch tires would probably survive better than 2 inch tires due to centrepital force. MV^2/r

[OptimaMan]

Crap, didn't realize this thread was 2 pages long! Hahaha - you guys already said that stuff. LOL

[studysession]

Yeah - but the #'s and reality are not always correct. You can do the math all day long - but when you change size of tires, you now need a motor that has enough torque for the bigger tires and so forth.

[CrazyPhantom]

Yeah, study, I think these motors will have the torque needed tho, I just got an Email that my motors should be in, in a day or 2. so I will get some pcitures of it mounted, and get the final chassis desing for the carbonfiber and titanium chassis made.

[CrazyPhantom]

I know this sounds stupid, I just never thought of it before, when you have a 2 speed set up, does the secodn part of the clutbell not engage till higher RPM's? or is it always engaged? Help me out here guys

Also, Do you guys think I could use these tires? They are 8 1/2 inches tall, I could take that tread off and make it a slick tire, I could also narrow the tire, But because it is 8 1/2 Inches, Im guessign it would help out in the speed?
http://www.italtrading.it/risorse/foto/imex/imx7500.jpg

Let me know guys,
Joe

[ducati777]

Those tires would get you up there... but I suspect they won't hold together, or will balloon like crazy. I think you should be lookin at 8th scale buggy wheels, they make foams that should work just great.

You definately have the power to get the speed you want, don't let anyone give you any crap about that. Gearing is the ONLY thing holding you back.

You could also look into 5th scale wheels, they'd probably work well and would be about the same size as a buggy wheel.

[WheelNut]

First of all touring car tires arent 2" in diameter, they 2.4 to 2.5" tall. Super Nitro rs4 tires would be a good solution, but no one makes them with belts (although steve ponds 100mph snrs4 had specially made belted tires I believe), so tehy will balloon like crazy and your car will become squirmy, and it will lose traction on top of that because the contact patch will get smaller. Mabye an extremely high downforce body might be able to counter this problem. Now if you could get some nice soft belted slicks in a 1/8th scale size, that would be perfect. Of course that could bring up new issues of suspension geomemtry and ride height since the car will become much higher off the ground with the bigger tires.

The jumbo kongs wouldnt work unless you had a disgusting amount of power, or some nice teardrop shaped covers to put over them. They are so huge they would create tons of drag at over 100mph, and you going to want to go over 130mph if you want to win I'm sure. Not to mention they are really really heavy.

[WheelNut]

First of all touring car tires arent 2" in diameter, they 2.4 to 2.5" tall. Super Nitro rs4 tires would be a good solution, but no one makes them with belts (although steve ponds 100mph snrs4 had specially made belted tires I believe), so tehy will balloon like crazy and your car will become squirmy, and it will lose traction on top of that because the contact patch will get smaller. Mabye an extremely high downforce body might be able to counter this problem. Now if you could get some nice soft belted slicks in a 1/8th scale size, that would be perfect. Of course that could bring up new issues of suspension geomemtry and ride height since the car will become much higher off the ground witht he bigger tires.

The jumbo kongs wouldnt work unless you had a disgusting amount of power, or some nice teardrop shaped covers to put over them. They are so huge they would create tons of drag at over 100mph, and you going to want to go over 130mph if you want to win I'm sure.

[delphidude]

i don't think twin 21's are they way to go. on rctech.net there are many engine modders there. i would try to get either 2 rossi's or 2 sirio's that have been hand ported or spring for two evenly matched jp .12 5 port outlaw engines or two jp mod outlaw .21 on road engines. your design is very good and i am impresed, but you need better engines, though with 2 nice 5 port 12 or nice on raod 21's with the kyosho 3 speed i bet you could flirt with 115mph or even 120mph

[CrazyPhantom]

Anyone know where I can get a clutch bell that will fit onto a bigblock motor and has more then 18teeth?

[ducati777]

@Crazyphantom, Sure, look for the pinions made for the 4 stroke cars from.... Ugh, I can't remember, but they had incredible pinions. Also... was it the MGT? one of those new trucks has some pretty sizable pinions, I'll see if I can get you something more specific. Keep up the good work, I can't wait for you to post I went XXX.xx mph today!!!

@Delphidue. You are not making any sense. Dual .12's may come up with some higher rpm, but we're looking for a work around on the gearing. Less power but more rpm isn't a solution. Also recommending he buy 2 new, different motors is not a solution.

Now to even bring up the 3-speed idea shows me you either haven't read this thread the whole way through, or don't understand the gearing issues this car is facing.

@Wheelnut, nice comments, I agree 8th scale wheels are the way to go. What do you think about buggy tires? I only bring it up because I bought a set of foams for onroad racing with my 8th scale buggy. They're about 5.5 inches tall which I think would really help.

[CrazyPhantom]

@Wheelnut, nice comments, I agree 8th scale wheels are the way to go. What do you think about buggy tires? I only bring it up because I bought a set of foams for onroad racing with my 8th scale buggy. They're about 5.5 inches tall which I think would really help

Well with no force,no drag, engines running at 37000 rpms the 5.5 inch buggy tires should get me to 124.263mph, that is with a 19t clutchbell, and a 36tooth spur, If i use 6 inch tires, with the same gear configuration, I coudl reach 135mph .if I can collect some I would be able to get the 2 speed, but not now. Does this speed sound right? I tried to use Radio control zones's speed calculator, LMK what you guys think

[ducati777]

heheh calculating speed is pretty easy, I write my own calcs in excell, and have kept them just for this thread...

BUT, check this out Crazy:
http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXBMJ1&P=7

Booyakah! I'm still lookin for you.

[CrazyPhantom]

heheh calculating speed is pretty easy, I write my own calcs in excell, and have kept them just for this thread...

BUT, check this out Crazy:
http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXBMJ1&P=7

Booyakah! I'm still lookin for you.


That clutch bell wont fit onto a .21 clutch setup tho.

[delphidude]

i don't think that you understand the resistance ( sp?) of air at 100 mph. go out on anopen road and stick your arm out at 80, 90, and 100 mph. you need an egine with lots of rpm and torque. rpm so you can reach that speed and torque to get there. it takes alot of power to fight the wind restsance. with higher gearing you will just lower the overall torque wich you need to get the engine spinnging to the rpm you need.

[ducati777]

i don't think that you understand the resistance ( sp?) of air at 100 mph. go out on anopen road and stick your arm out at 80, 90, and 100 mph. you need an egine with lots of rpm and torque. rpm so you can reach that speed and torque to get there. it takes alot of power to fight the wind restsance. with higher gearing you will just lower the overall torque wich you need to get the engine spinnging to the rpm you need.


Ugh here we go. You don't think I understand wind resistance? Did you read my name, has it occured to you I ride motorcycles?

Anyway moving on, time for some Q & A, the socratic method... Delphi, do you believe a motor making 25,000 rpm has more or less power than a motor making 30,000 rpm?? Can you explain to me the difference between power and torque? Can you explain which is more important and why?

[studysession]

If a person is into motor cycles they would catch onto that. but those of us who are not would not. ;)

[slickfast]

On a different note, I have heard some downsides of the dual engine design and am still not quite sure whether it is true:

With the two engines running at the same time, the rpms would not be exactly the same, and therefore makes the rpm output of both engines lower because of the contradictory torque and rpm.

It's kinda hard to explain but I was just wondering what all of your thought were on this.

:)

[ducati777]

Good question slickfast, lemme try and answer it. What you heard isn't true.

The two motors will be trying to turn different rpms, namely redline. Anytime you apply the gas, the motor trys to shoot up in rpm, but the clutch engages and the car has to accelerate for the motor to gain in rpm. Thus the motor is always under load from the spur gear. Even if another motor is trying to push harder or softer, both are being held back by the spur gear, and not each other.

If you were to run the motors crank to crank, with no load, then they might interact with each other, but think about a 1:1 car, or any multi piston engine, the pistons aren't ever making the same amount of power, but they don't counter each other out. If that were the case, V8 would only be as powerful as its weakest piston, but instead they all work together... just think of dual motors as a multi piston motor.

@studysession: You're right, its a catch 22 and I was probably being a lil pompus. I just feel I have a pretty good grasp on physics and motors, so the assertion that I don't understand air resistance rubbed me the wrong way.

@Anyone who doesn't ride, Ducati= italian performance motorcycle. While I don't own one, I do own a 1100cc suzuki which is stupidly fast. I know wind resistance. I know 130mph of air not only on my arms, but my whole body, and I understand its A LOT.

[studysession]

Yeah - I have been doing speed runs for a long time. It is a lot of work. This past wekend I did a speed run atempt and had problems with the car so even though I leanred a lot from it, it was mostly a no-go.

All these posts I keep reading and people making it sound so easy. If it were that easy then go do it. Plain and simple. I am trying to myself - I really admire siggy for already doing it. Can't wait till I reach that point.

Will be retuning the car and going back down south for another speed run early next month. The weather is much better in the southern part of the country.

Also for the dual motor setup - one of my sponsors said similar thing about doing dual brushless. Getting the timing just right on a dual brushless setup he said is hard. And for what I am trying to do he did not recommend it at all. He said if I was just bashing around then by all means. But for doing a speed run he said not at all.

But everyone is different - I honestly believe the speeds can be accomplished with one engine or motor. I personally and trying to do mine with electric.

[ducati777]

Well if I had the money and time I'd do it study, I'd really love to do it. Dual nitro motors won't have the timing issues of brushless, but I could see how the pulsed output of a brushless might interfere... I'd expect you to run dual ESC's for a dual brushless right?

As far as saying its easy. Hmmm I guess in my mind it is. Mind you this is sitting here in front of a computer daydreaming. It all comes together in my mind easily enough, but I completely understand that thinking/calculating and doing are totally different. But I do believe if you keep the fundamentals in mind and take a pragmatic approach, anyone should be able to break the record. Thats why I get annoyed when people say things like:


"you need an egine with lots of rpm ... so you can reach that speed "

Ugh when will people learn about different gear ratios... or:

"but you need better engines, though with 2 nice 5 port 12 or nice on raod 21's with the kyosho 3 speed i bet you could flirt with 115mph or even 120mph"

Yet again no concept of gearing, and this time recommending dual .12's to get more power than his dual .21 setup... I sure hope thats all a big typo, the whole post...

Hey study, you seem to talk about your project a lot more at rcuniverse... IMO its a bunch of kids over there, these boards seem much more your speed.... Why not do a little show and tell of your current project?

[studysession]

Yeah - I am a moderator at RCU. I agree with the level of people though. Just don't want to sit here and post same info twice so I keep a blog going fo the adventure on RCU. :) Good stuff and loads of fun.

I have some fun project stuff I can post here on this forum - just need more time. ;)

[studysession]

Funny -

I am a moderator on RCU - I am now writng a couple of articles that will be appearing in RCU Magazine.

As for my projects - the exact speed car I do not give details. I do my testing in a TC3 and a Colt10. Donnie sent me 2 Chili-Pepper motors. We are going to try and make my TC3 do close or over 100MPh is our goal and post pictures and info all about it on his website. I messed up my chassis, so last night I ordered a new one from tower hobbies.

I use those 2 touring cars when I test all these brushless products. Last night I ordered me a new EMaxx from tower hobbies to start testing the stuff for offroad applications and will be doing some testing of them in my converted Hyper 7 when it is finsihed. I enjoy it and agree with you about the level of people. Just RCCA is not as busy and I also post in the plane areas on RCU even though I do not have any planes yet.

As for the speed car though - Only sponsors are allowed to have any details - and even then only MTroniks knows all of it because they are local and I can physically take my cars to their factory to get help for working on them when I need. All my other sponsors are in other countries - so they do not get to see/know everything that goes on. It gets hard when most things are through email or over the phone. I tell them as much as MTroniks allows me and that is it and a lot of that does not get posted on the forums.

But as for what I do with my TC3 and other cars with testing the brushless products it is good for them. It is like free publicity for my sponsors the more I talk about them and what I do is the more people here how their products perform or don't perform. So far everyone has provided me with rock solid products that I have been able to take way over the manufactors recommended limits before anything bad happens to them which is nice.

I feel if I post to much about the car I actually do my speed runs with - people will copy it and try exact same thing. Like when I break the record, I will not publish what my speed was. Just publish I broke the record and leave it at that. And because I made all these custom gear adaptors and gear boxes that allow taller than normal gear ratio's sponsors do not like me publishing what gear ratio's I run.

hope that all makes sense -

It is easier for me though to keep posting in one spot like I started on RCU. I started a thread where I go and post what I am willing to share and that is it. I use it like a blog and if anyone tries to take it off subject I delete those psots. Sounds mean, but when your a moderator you can do that. :)

I could do the same here, but then I am afraid I would get confused. ;)

[studysession]

Funny -

I am a moderator on RCU - I am now writng a couple of articles that will be appearing in RCU Magazine.

As for my projects - the exact speed car I do not give details. I do my testing in a TC3 and a Colt10. Donnie sent me 2 Chili-Pepper motors. We are going to try and make my TC3 do close or over 100MPh is our goal and post pictures and info all about it on his website. I messed up my chassis, so last night I ordered a new one from tower hobbies.

I use those 2 touring cars when I test all these brushless products. Last night I ordered me a new EMaxx from tower hobbies to start testing the stuff for offroad applications and will be doing some testing of them in my converted Hyper 7 when it is finsihed. I enjoy it and agree with you about the level of people. Just RCCA is not as busy and I also post in the plane areas on RCU even though I do not have any planes yet.

As for the speed car though - Only sponsors are allowed to have any details - and even then only MTroniks knows all of it because they are local and I can physically take my cars to their factory to get help for working on them when I need. All my other sponsors are in other countries - so they do not get to see/know everything that goes on. It gets hard when most things are through email or over the phone. I tell them as much as MTroniks allows me and that is it and a lot of that does not get posted on the forums.

But as for what I do with my TC3 and other cars with testing the brushless products it is good for them. It is like free publicity for my sponsors the more I talk about them and what I do is the more people here how their products perform or don't perform. So far everyone has provided me with rock solid products that I have been able to take way over the manufactors recommended limits before anything bad happens to them which is nice.

I feel if I post to much about the car I actually do my speed runs with - people will copy it and try exact same thing. Like when I break the record, I will not publish what my speed was. Just publish I broke the record and leave it at that. And because I made all these custom gear adaptors and gear boxes that allow taller than normal gear ratio's sponsors do not like me publishing what gear ratio's I run.

hope that all makes sense -

It is easier for me though to keep posting in one spot like I started on RCU. I started a thread where I go and post what I am willing to share and that is it. I use it like a blog and if anyone tries to take it off subject I delete those psots. Sounds mean, but when your a moderator you can do that. :)

I could do the same here, but then I am afraid I would get confused. ;)

[CrazyPhantom]

um, why did you post twice, and secondly, this is my post not yours, find your own spot to talk about your cars and problems


also:
If I were to get some good 2 new motors,which motors you think I Should get? they will have to be .21's

[studysession]

Not sure how it double posted - I just answered some questions ducati asked. The intentions were not to jack a thread.

[ducati777]

Bwahahah!!!
All in all no disrespect Crazy, but it is funny to hear Study say how he deletes OT posts in his own threads over at RCU, only to crazy go nuts over here..

Back to the issue at hand. Before you drop 600 bones on new motors, have you figured out how your going to gear the car? Have you found tires and wheels? Have you run it with the motors you have and found it didn't have the HP?

I'm all about the systamatic approach, and at the momemt new motors shouldn't be on your mind. You've got plenty of issues to deal with first. Plus go read the motor forums if you really want to know. I've got some recommendations, but i'm more concerned about the fundamentals of your car.

[studysession]

Last night when I posted - I deleted the long one and replaced it with the short one. Now today there are two long ones and the short one -

Anyhoo today I was thinking of the two engine thing and how the timing may effect things. people use dual nitro setups on nitro trucks. Just never seen it on a car. Speed runs do not last very long - One speed run for me is over within 30 - 40 seconds from start to finish.

Do you really need two fuel tanks or can you get away with just one? That would reduce weight int he car.

[ducati777]

I agree, 1 tank, dual feeds off it. Towerhobbies has various T fittings for the multi engine airplane guys.

Now here's a question, both pressure lines, or just 1? I'm inclined to say both....

[studysession]

That is a good question - anyone know what they plane guys do? I would think 2 lines as well. But I maybe wrong.

[OutFrontFrames]

Big block clutchbells? No problem. Depending on what your spurs are you can use NTC3 clutch bells. They are a metric bearing therefor will fit the required 5mm shaft bearings. We run SG shafts in our sprints all the time.
Also, do you have a machinist for your carbon chassis? If not look me up.
wesbrown@outfrontframes.com
Also, I think that 2 .21's are going to give you insane tourque and power but, your not able to use the power because you cant gear it tall enough to take advantage of what you have. Using the taller tires like narrowed 1/8 scale on road tire/wheel combo I feel would be the way to go. You would get a little more diameter and no expansion. Trust me rubber tires will come off the rims. Use Serpent rims, if need be the plastic will stretch just a touch. We have done many speed runs in the past with Rocket Cars. You guys are talking 100mph, 120mph, try making a car hold together at over 200. Its a pain in the a$$ but it can be done. Your body is going to have to be molded from at least .060 lexan to give you the required stiffness at that speed. Even then I dont know if it will hold its shape. This information applies to all the guys trying to do the speed run. I learned all this the hard way. Many botched 1/12th scales with rocket motors as well as home built machines. On the rocket cars we had to vac form our bodies from .060 and then reinforce them with carbon string so that they hel their shape. Underbody ground effects also come into play. Yes, if you have enough downforce on top it will help eliminate the feeling of whats going on underneath, to a point. I guess what I am getting at is that there is more to it then just strapping 2 motors to a chassis and thinking its going to fly. It might pull a stump out of the ground but a speed run is a whole other ball game. Especially when speeds are going to over 100mph. There is alot of planning that goes along with a project like this. If they were going to allow thrust propulsion I would be all over it but since its not I am standing back and watching. Good luck guys and if you have any questions let me know.

[studysession]

Do they make foam tires for 1/8 scale buggies like they do for MT's? If so use them.

[ducati777]

Hmmm I dunno, maybe something like ohhhh, THIS!!!!! Booyah! (my cars)


http://www.freepixhosting.com/uploadedfiles/100_0795.jpg

[cool head]

here's my idea that i was toying with. put the 2 engines in-line. if you use a pullstart engine you can rig the crank to go through the end plate and turn the other engine through the oneway.(start the rear engine and the front will start too). then weld a drive cup to to a clutch bell and go direct drive to the rear diff. that was the only way to get the ratio even close to getting a record.

[OutFrontFrames]

here's my idea that i was toying with. put the 2 engines in-line. if you use a pullstart engine you can rig the crank to go through the end plate and turn the other engine through the oneway.(start the rear engine and the front will start too). then weld a drive cup to to a clutch bell and go direct drive to the rear diff. that was the only way to get the ratio even close to getting a record.
That still isnt helping his gearing issues, your still using 2 engines, and working out the timing on 2 engines mated at the crank would be a nightmare. Not only that but you cant connect 2 cranks together that way. The rod would hit the crank protruding thru the now leaking backplate.

[ducati777]

What timing issues? Its just a 2 cyl motor... I don't understand why people always think dual motors will fight each other... the limiting factor is the spur gear, and they're both trying to go faster than that.... I'm really not trying to single you out, OUTFRONT... but in general it seems like people in RC just don't understand a motor can have more than 1 cylinder....

Direct drive to the diffs is about the best he can do. 38k rpm direc to diff, use a 3 inch tire yields 119mph... right in the ballpark. Plus thats Super 10th scale sized tire, which keeps him closer to 10th like he wanted to in the beginning... I think 1 motor direct to each diff, easy to do and gives him the speed.

[studysession]

MT's do the dual engine thing all the time. They even sell them with dual engine.

Brushed motors and nitro powered engines should not have any timing issue.

JMO

[OutFrontFrames]

Your right timing a 2 cyl motor is no big deal. Heck they Saito 9 cylinder motors. I understand that but the timing of the pistons hitting TDC opposite of one another when connected at the crankshaft is the issue I was addressing. The motor would beat itself to death to vibration dynamics before it ever got tuned right if the piston timing wasnt right. I have been doing this gig for a long time. It would be more hassle than its worth to connect 2 .21's at the crank, as well as impossible using the method that was described above. Even fighting the different speeds on the spur with 2 seperate engines isnt that big of a deal really. People build dual engine cars all the time. I have raced real cars, and every type of RC you can name. Even did some tractor pulling for a little while in the early 80's. I dont feel singled out I feel as though my comments are misunderstood, no big deal.

[ducati777]

@Outfront, good response... ahhh its so nice to be able to talk without a flame war, to that I thank you.

Lemme see... ummm your right on connecting the cranks using the above mentioned idea. But now that we're on the subject, why the heck haven't the car guys jumped on the multi cylinder train???? Airplanes have all sorts of flat 4's, radials, rotary... we get no love. 1 piston, and go. Blah, a v twin would be SAAWWeeet. Not some hack job, straight up from the factory, v twin, balanced and ready to pull 30k rpm.

CEN and TT bumped the displacements with .46 and .70's... but I'd be way more impressed with a V twin .21 which I guess makes it a .42 now...

[OutFrontFrames]

Because the added rotating weight kills fuel efficiency as well as makes the price go way up due to extra manufacturing costs. At least that my theory. I agree a twin would be hella sweet but not really practical in our allpications unless you are a basher. Which is fine to be, but most engines whehter they are high end racing mills or lower end bashing mills all spawn from racing technology. I am here to discuss not flame.. :D

[ducati777]

Hmmm dual .21... needs a tricky crank, tricky intake... hmmm the complications keep adding up in my head.... Okay scratch that and go surface use conversions for existing multi cylinder airplane engines....

We use the crank to time the intakes on our motors, with dual pistons I doubt you could use the crank in the same manner... Unless both cyl's were 0 degrees in relation to each other, but then you gotta ask why not just stick to 1.... Yea you're right its probably not practical, but hella sweet.

[OutFrontFrames]

running the piston timing 180 out from each other and using a dual carb setup would work. However it would be a nightmare requiring a vacuum gauge to calibrate each carb. Kinda like on an big motor using dual Weber's or Dellorto's, non efi style. My opinion is that if your going with a piston engine than you need a multi speed system with much tourque. Making a 4 or even a 6 speed tranny would be much easier. As long as your engine has enough tourque to pull the taller gear. However, the car would already be traveling therefore lessening the amount of tourque that would be needed to pull the taller gears. Robinson Racing can and will make you whatever type of clutch bell you need with as many gears on it as you need. A custom layshaft and a multiple spur, one way shifting setup, would be needed. Tuning the shifting would be a pain but it can be done and may be the answer. The extra gears, and one ways and the longer shaft would still be lighter than the second engine. One engine is always easier to tune also. Just thinking out loud, which is what i do best, most of the time.

[CrazyPhantom]

OK, alot to answere so I'm going to do my best,

Study:Im not using 2 tanks.

Ducati:I have figured the gearing.I am going to use 1/8 buggy foams.

Outfront: I plan on using .060 lexan, I have cut apart some 1/12 scale bodies for the *cockpit area*(the little dome shape that is required for the competition) and yes, I already got a machinest for the carbonfiber parts. You think Robinson will accually make me some custom cltuchbells? Having a 4 speed would be awsome, I would just have to figure out how to make one. If you have any idea's or would like to make it, let me know

[cool head]

That still isnt helping his gearing issues, your still using 2 engines, and working out the timing on 2 engines mated at the crank would be a nightmare. Not only that but you cant connect 2 cranks together that way. The rod would hit the crank protruding thru the now leaking backplate.

first off, muti cyl engines do not have to be timed together. a few yrs ago in GP500cc racing they used 4 cyl engines all firing within 90deg called big bang engines. point was to help cool the tires before the next pulse. same hp, but less wear and tear.
second, you can connect 2 cranks that way. it may not last 3 gallons, but it can work, you just need to make an end piece for the crank. and if your stupid enough to mate it so far that the shaft hits the rod, you shouldn't be modifying anything. the only forseeable broblem is wearing out the crank and oneway. doing some research on the different types of p/s drives and picking one with stouter parts is a good idea. i wouldnt use the setup like on the hyper.21's. but more like the setup thats used on piccos.
3rd, why would the back plate leak more just because your running a crank end through it? some engines have a constant spinning p/s shaft like the traxxas engines. but it would probably work better if you put a sealed bearing on the back plate instead of the bushing.
4th, without the primary gear reduction (spur/clutch) and using the differetial assembly as the only gear reduction seems to be the only practicle way to get close to the speeds he's after with the setup he wants to use.
5th, 2 good .21 engines will give it the apx 5+hp your gonna need. also your weight could be distributed in the middle of the chassi allowing for a more streamlined body and chassi.
6th, tuning would not be a nightmare if you simply mount the engines one at a time and tune them before mounting them in tandem.

;) :p :cool: merry x-mas

[Jetskiboy77]

6th, tuning would not be a nightmare if you simply mount the engines one at a time and tune them before mounting them in tandem.

Or you could only start one and leave the other engine not started, and then when the first one is tuned, you shut it off and start the second one and tune that one. Then you start both, and you have some insane power at your finger tips. Merry X mas all :D

[ducati777]

first off, muti cyl engines do not have to be timed together. a few yrs ago in GP500cc racing they used 4 cyl engines all firing within 90deg called big bang engines. point was to help cool the tires before the next pulse. same hp, but less wear and tear.

I remember those bikes! I also heard they used it as a sort of traction control, the idea was the tire would have time to hook up again before the next pulse hit...



4th, without the primary gear reduction (spur/clutch) and using the differetial assembly as the only gear reduction seems to be the only practicle way to get close to the speeds he's after with the setup he wants to use.
Thats what I keep saying.

5th, 2 good .21 engines will give it the apx 5+hp your gonna need. also your weight could be distributed in the middle of the chassi allowing for a more streamlined body and chassi.
Hmmm no one seems to buy into my idea of 1 motor per diff, even though it would give all the above benefits without the added complications...

[cool head]

i think rear wheel drive only would be much lighter. and if the engines were independent than you couldn't control the power bias very well.

[ducati777]

Well I agree, but power bias shouldn't be too much of a concern, just WOT!!! More more more!

I think 4 wheel will really help for handling issues, and of course if the track is limited in size. But I agree 2wd is typically simpler and lighter.

[TMaxxBenny25]

im confused

[CrazyPhantom]

Sorry guys, havent been in thsi forum for a bit, well I dont got much to update you guys with besides: I got scrude on the modding job by www.Ebmods.com , they never had time to get them modded, so they just sent the back with out telling me they didnt do anythign to them.

[atm92484_3]

If you can't get them modded, why not just get a pair of good race engines to replace the sport engines?

[CrazyPhantom]

If you can't get them modded, why not just get a pair of good race engines to replace the sport engines?

if i get them modded, And later I WANT to get better motors, I can sell the modded motors(modded sell for more) and I will have more money for the raceign engines. Im thinking about the WS7II's for this project, Im tryign to see if I can trade both my motors for 1 to someone. then i would just buy another one when i Have more cash.

[Chris LaPanse]

Will you stop posting unrelated links in foreign languages already?

[DaFF]

CrazzyPhantom,

For your tire problem, you can try larger od foam.

I also have a 1/10 TC and I did use the following:
- 1/10 scale truck rim
- 1/8 scale front foam from on-road car

It does work and it is still very light ( less stress on your tranny ).

1/8 foam will hold on speed around 100 mph, I know that... pass that speed, I don't know...

Try this setup and see how your transmission behave because the conjonction of very LOW gearing, extra grip and rotating mass from the bigger and larger tire will most likely kill your diff pretty quick ( alos I guess it should be OK for one or two insane speed run )

If you want, you can get even bigger od tire. If I remeber right, Phanter does foam tire for Monster Truck and they are BIG.

Picture enclosed is a comparison between regular 1/10 scale 2" od TC tire and my 1/8 scale foam on 2.2" truck rim. If your transmission hold, you'll gain approx 30/40% more speed with this setup.

For your speed calculation, 38 000 rpm under load is a very high target - I do own a R&B C5 screamer - and I also saw R&B C5 Circuit Rody tuned engine. Those are 8 port + 2 bypass and they are the absolute top rpm engine, I do not know of ANY engine screaming like them at the end of my track...

As for Ducati idea on the locking the center diff, forget about it, because it will put so much internal stress on the diff that the spider gears will fail.

Good luck

DFF

[studysession]

I recently had a foam tire from my speed car blow up - Made loud pop and scared the pooh out of me. Bent the rear axle in a 90 degree angle from the preasure and messed up few other bits as well.

[DaFF]

Usually, when foam tire fails, it is when chunk of foam flies off at speed.

I am using high quality 1/8 foam used on high end serpent car and when you fit a 1/8 foam on 2.2" truck rim, you have to stretch the tire pretty good to fit it over. Also, high quality contact type glue neeed to be used.

One can also put them on a lathe to make sure they run true - unbalanced tire at around 100 mph will be hairy -

I can guarantee that with those precaution, this tire and rim will hold up to 100 mph, some of the serpent 1/8 cars have been radared at 80+ mph at my local track without any problems using the very same foam tire.

DFF

[CrazyPhantom]

wow, thanks for the ideas, I was also looking at those onroad slicks(1/8scale) tires. and put some duct tape and other stuff on the inside to keep them from ballooning.

[frank13]

in europe they race 8th scale touring cars with what i would call a 8th scale wheel and tire that resembles 5th scale wheels and tire(only smaller) would make a good choice

[CrazyPhantom]

I should be sending out the template for the carbon fiber chassis VERY SOON. Im waiting for a payment from a friend, and then Im buyign a servo off the guy that is making my carbon fiber chassis, so when I send money, Im sending the template, and the shock tower templates. I got the frotn bulkheads finished today and mounted, so my suspension is basically done. I am also ordering the parts for my drivetrain setup ( gears, gear hubs, ect...) I am having problems with my digicam (card error) so I wont be able to get some pictures till probelly later this week. If anyone has a set of 1/8 scale buggy rims, or rims and tires they would like to get rid of for cheap to help me with this project, that would be great.

Thanks,
Joe

[CrazyPhantom]

I got my gearhub for the center spur setup that I plan on usin today. I also got 2 gears for the set up. I will get some pictures later.

[CrazyPhantom]

Ok, I got some pictures of the gear hub. This will be the set up I will be using.

http://img.photobucket.com/albums/v417/Area51Project/Joes1.jpg
http://img.photobucket.com/albums/v417/Area51Project/Joes.jpg

[CrazyPhantom]

here is a CAD drawing of the project done by another member on this site.
http://img.photobucket.com/albums/v417/Area51Project/crazyphantom.jpg
it isant done, but this is as much as he has gotten done so far, it looks so sweet.

[aus jd 2703]

hey guys had an idea i like the two motors but the idea of 2 onto a single spur isnt so good so i was thinking 2 differnt spurs with diff ratio's maybe a 2 speed box but the idea is u have duel throttle control and idle one motor up to say 90mph then the other lower geard motor takes over to 180mphor some thing like that the requirement would be its shaft drive and ud need to ad weight to ofset the staggerd engine desingn just my 2c so pm me with ur comments please

[ducati777]

Soooo whats going on with this project?? Have you pieced it together, ran it at all? I think your design is great, so lets hear some news!

[mook]

These 1/8 on road tyres are built by medial pro & are meant for buggies. They are moulded as-one piece-, so i guess ballooning would not occur.

http://www.meganitro.com/medial/J22025-0.jpg

see for more info

http://www.meganitro.com/


"Tarmac II 25, 35, 45, 60 shore 1/8th Rally IAS Tires Pre-glued
From the same great minds at Medial Pro that brought you the phenomenally popular I.A.S. 1/10th scale sedan tire, now bring you the Tarmac II I.A.S. 1/8th scale buggy tire. Now all you off-road warriors can wreak havoc on-road as well. The Tarmac II features the patented I.A.S. (Integrated Air Support) technology which means the tire and insert are one molded piece. The result is a very flat and true tire with very little distortion under load. The Tarmac II comes pre-mounted in 25, 35, 45, and 60 shore compounds. These tires are a big hit on the pavement and rally courses. Check out Medial Pro's Rally Tire chart for shore to surface applications.

"

[supernitro_guy1]

what happened to crazyphantom?

[Toyotatogo]

These 1/8 on road tyres are built by medial pro & are meant for buggies. They are moulded as-one piece-, so i guess ballooning would not occur.

http://www.meganitro.com/medial/J22025-0.jpg

see for more info

http://www.meganitro.com/


"Tarmac II 25, 35, 45, 60 shore 1/8th Rally IAS Tires Pre-glued
From the same great minds at Medial Pro that brought you the phenomenally popular I.A.S. 1/10th scale sedan tire, now bring you the Tarmac II I.A.S. 1/8th scale buggy tire. Now all you off-road warriors can wreak havoc on-road as well. The Tarmac II features the patented I.A.S. (Integrated Air Support) technology which means the tire and insert are one molded piece. The result is a very flat and true tire with very little distortion under load. The Tarmac II comes pre-mounted in 25, 35, 45, and 60 shore compounds. These tires are a big hit on the pavement and rally courses. Check out Medial Pro's Rally Tire chart for shore to surface applications.

"

I got some of those on orders for my GT those are susposed to be some bada**ed tires .. :D

[mook]

yup they are excellent wheels. The soft compounds can burn out real quick, so my next order will be for 65 shore 'hard' compound. Once the tyres are warmed up, they are super sticky.

These should not balloon at all.

mook

[CrazyPhantom]

Hey, guys, I totally forgot about this post on this forum. This project has been moving very slow lately. To post an update, I just ordered a HPI R40 2 speed. I got it off ebay, and should be in the mail soon. I just graduated so I should be getting a bunch of updates on this project due to money gains. 2 weeks from now I should be getting my titanium chassis, and my either titanium shock towers, or carbon fiber shock towers machine ( or aluminum ). Besides that, there isant much new with this project, I will try to keep you guys updated on this project since it should start to move along again.I know for sure I wont make the r/c challenge, But Im still going to try to break Cliff Letts record so I know mentally i did it. I am trying to get the chassis set up for now, and the whole drivetrain set up, then Im goingto order either foam buggy wheels, or rubber buggy wheels. Here is the 2 speed i just bought. Let me know what you think.

-Joe

[CrazyPhantom]

I got my 2 speed in the mail today, so I will get some pictures later

[dynamite25]

Hi for you car why don't you use two of these engines
http://img.photobucket.com/albums/v284/dynamite25/eng-hyper21-8boost.jpg
as i am using two for my car that i am building soon,the enigne produces 2.7hp and revs to 38,000 rpm.

[cool head]

unfortunatly hyper engines aren't known for having much bottom end to them. their kinda guttless under 30k rpm. so those engines probably wont have enough grunt past the shift point.

[dynamite25]

So what would be a better engine as i will be using a two speed in my car that i am building which is based on this car Radical SR8 sportscar (http://img.photobucket.com/albums/v284/dynamite25/aSR8204.jpg) and is 1/5 scale .

[cool head]

if it were my call i would not run small nitro engines in that rig. i would modify an exsisting G23 to run on nitro. you can probably get 10-15 hp out of one. that should be plenty enough to push it into triple digits with the right gearing, pipe, tires ect. the problem with running 2 little nitro engines is the tuning nightmare. i'm a good tuner and i couldn't get them perfect under speed run conditions.

[dynamite25]

I think i might be best to use a FG Zenoah engine G23 i think i can get one for £330 and how much would it cost to convert it to nitro,the car will be running on FG 1/5 wheels with slick tyres.But could it be done if the .21 engines were tune right as i am pretty good at tuning my engines for top performance but still make them last along time.

Also here is a side drawing of a Radical SR3 to show how big the car will behttp://img.photobucket.com/albums/v284/dynamite25/Copyofsr3outline.jpg

[cool head]

there are kits availablee to do the conversion that include aky carb and glow plug adapter. there are a lot of mods you can do to get a lot more out of the G23. but the best option for your aplication is gonna be NOS on top of the nitro conversion. that will truly bouble your HP and best of all, you'll have the torque of the large displacement G23. most of the good info you will need will be in boat and go-ped sites
http://www.speed-sports.com/Go-Peds/Goped-NOS.html

[dynamite25]

Now that i have started the drawings for the chassis i don't think a G23 engine will fit in behind the rollbar because i only have 150mm between the rear axle and the rollbar to fit a engine in.

[CrazyPhantom]

UPDATE!

Well, not too much happening on this project, I got an erge yesterday to start basically redesigning this project, I have decided not to go with chopped up parts to just get away with things, now that the speedchallenge didnt happen, I have plenty of time. I have redesigned most (if not all) the parts, and I will be getting custom bulkheads(aluminum), shocktowers(carbonfiber),chassis(titanium),top chassis(aluminum),giga crusher 3 speed tranny, v-angle custom twin motor mount(aluminum),custom driveshafts(aluminum),

This is my basic plan for this project.
Got most of it designed up on CAD.

here is the bulkhead(doesn't include the hole wher the diff will go through) This bulkhead I custom designed to allow the a-arm to be incorperated into the bulkhead. This will bring the a-arms in and clean up the design of the project a great amount.

[CrazyPhantom]

Kyosho 3 Speed on the way to my house!

[fasterthanspeed]

you should probably run 2wd.(just my opinion)

[mook]

Kyosho 3 Speed on the way to my house!


Im installing a three speed into a landmax (mp 7.5). The first person to do this to a lm2 (evilgearhead) clocked his car at 74mph using a kyosho gs21r engine. He also said it was still pulling but had to stop as he was running out of space.

you should go warp speed with a twin engine setup!

Heres a pic of my nearly completed landmax three speed.

http://img.photobucket.com/albums/v448/wombwarrior/car3058.jpg

[fasterthanspeed]

What is the diameter, width, and hex nut size of the medial pro tarmac 2?

[fasterthanspeed]

Does anyone Know?

[vad]

What is the diameter, width, and hex nut size of the medial pro tarmac 2?


The Tarmac 2's are 17mm, standard with most 1/8 scale buggies.

[fasterthanspeed]

Any updates Crazyphantom?