Is 200 mph REALLY possible.

[KartMan]

While laying around this morning, I was pondering this burning question. Is 200 mph really possible on an oval. I truly believe; NO!!! I do not ever see r/c cars hitting 200 on a flat oval track. Now, if we could only run these at the salt flats, with a chase car... THEN MAYBEE. I honestly don't believe they will get much faster than 150-160. You have to realize that as speed increases, the drag multiplies much faster. So, you need increasingly more horsepower to go faster and faster. The biggest factor in this competition is having to turn left at the end of every straight.

Let me know what you think about this.

[MicroMan]

I'd bet it's possible but you would need a chase car because there is no way it will happen on a track short enough to keep your car in radio range. If you could find a track big enough and smooth enough, i'd think it would be possible on an oval.

[KartMan]

Micro,
ONLY if there were some seriously banked corners. Not on ANY flat track will an RC car break the 200 mph barrier. That is my opinion. I would love to be prooved wrong.

[mgs9]

any things possible, but i dont think we will be seeing any cars going more than 140 this year. people have said that they have got there cars up to 150+ but they probbly have run there car a bunch of times to tweek one run of that speed, you only get 3 runs.
mabey im rong but thats what i think.

[Dallas]

Micro,
ONLY if there were some seriously banked corners. Not on ANY flat track will an RC car break the 200 mph barrier. That is my opinion. I would love to be prooved wrong.

talladage, daytona
:D

[DaFF]

IMHO it should not be extremely difficult to have a r/c car making a wide turn radius at those speed.

If you have ever watched 1/8 nitro on a r/c track, you will see that they can take very narrow turn at full speed ( around 70/75 mph ).

As a matter of fact, at my local track, the 1/8 take the turn after the straight full bore and they don't seems to struggle doing it either !

small radius turn @ 70/75 mph should be roughly equivalent at big turn @ 200 mph, but that's only me guessing !

DFF

[anothermbdusted]

i personally dont think it would be possible due to the fast the tires i dont think would hold up to that kind of revolutions let alone the bearing on the inside of the hubs.... any kind of looseness you have in the steering would be so over exaggerated at that speed that it would have to be completly solid no possible slack at all.as for the body it would have to sit so low at that speed that the suspension when at a stop would be like a 1/4" above ground and as speed increases and downforce is compressing the suspension that it would be dang near scraping the ground.you sneezed and it would be all over.as for turns unless you got some serious angle were talking like a huge bowl i dont think it will be possible as like it was said befor youd have to slow down for the turn you would need a actual track freshly paved smooth as glass about the size of indy i would guess at...as for gearing lol get out the bicycle sprockets and modify them as for the speed run rcca did lomg time ago if i recall correctly they had to have one specialy made for this purpose.maybe i shouldnt be typing this but i dont think it is possible to do so on the ground with a rc vehicle maybe a dragster but i doubt even then would it be possible...

[minitdriver]

ok so u have a car that can hit 200 and you have the place to do it. What chase car r u going to use? u can't sit in the back of a pick-up. Jump in a Ferrari?C'mon.maybe in the future when radios, motors and tires etc. have the capaility to handle it but not now.

[Speedtester]

Huh? If I had a car that could do 200mph I would be standing in the stands.
The track is 3/4 miles I dont see any problems with range. The major problem is getting the car to stay on the track.

ok so u have a car that can hit 200 and you have the place to do it. What chase car r u going to use? u can't sit in the back of a pick-up. Jump in a Ferrari?C'mon.maybe in the future when radios, motors and tires etc. have the capaility to handle it but not now.

[KartMan]

Daff,
I understand what you are saying, as I am experieced with 1/8 onroad. What you are not considering, is to get up to the 200 hp range, you would have to have 2-3 .21 engines, and a butt load of fuel. What does this all mean... WEIGHT. Your 1/8 scales are able to whip around due to the fact that their weight is very low. I see what you are saying, but I still think 200 is not possible.

[rc10gtisthebest]

One thing you guys got wrong here is that there are NOT going to be chase vehicles. Your going to be standing in the Flag Booth controlling the rc car. Also most of the Purpose built rc cars have very ****** handling. So they won't be able to negotiate the turn at all.

I believe 150 is possible but not 200. If I wanted to do 200mph I would go to the Salt Flats with a PCM radio with Alkaline Batteries in it So I can use as much room as humanly possible.

Chase vehicles are a bullcrap cheating machine. No record should be consider where a chase vehicle is being used. This is just my point of few.

-Todd

[minitdriver]

I based my view on being at a place like the Salt Flats.I did not know a PCM radio had that much range which is y i critisized the chase vehicle.I really doubt that when this 200mph vehicle is made that it will reach 200mph in 300ft.Sorry if my views and arguements don't make sense.I'm 15 and argueing isn't my best trate.
Ken

[WheelNut]

I'm prety sure you could not drive an RC on the salt flats, it would be to loose, and unless it is perfectly smooth (which I highly doubt) you would loose tons of speed from the dust and the bumps. Plus at 150+mph I'm certain you will have almost no suspension to absorb those.

[rc10gtisthebest]

a good PCM radio can probably have atleast a 1/2 mile range or better.

What wheelnut said about the salt flats is more then likely true. But, if it's so bumpy then how can someone pilot a fullsize car with little to no suspension to over 400mph on it without any complications?

Anyways, if you want to get up arond the 200mph barrier, what track are you going to run on? Talladega? I don't think so, because if anyone has ever seen the surface of any race track, It is alot bumpier and has more cracks, pits, etc. then the roads we drive on day in and day out (public roads). And Irwindale Speedway where this is happening is way to small for anything to be accomplished of that magnitude.

Sorry if this post sounds rude, it was not meant to be, I just wanted to prove a few points.

-Todd

[pullinteef]

What wheelnut said about the salt flats is more then likely true. But, if it's so bumpy then how can someone pilot a fullsize car with little to no suspension to over 400mph on it without any complications?

-Todd

Because to a full size car (or bigger usually for speed run cars) a bunch of 5mm bumps don't make much of a difference. But to RC cars they might as well be 3 inch bumps as it wont run smoothly on either.

[Sparkey_STi]

Lol... if you all said no... your all wrong. Theather cars hit 240... eazy. Do a KaZaA or LimeWire search on "Rc car" and all variations of it... you should find a vid where one hits 200..

[rc10gtisthebest]

Tether cars aren't rc cars. They are model cars with functioning engines. All that happens for a tether cars is they are hooked up to a string, engine turned on full blast and they go around a high-banked circle a ton of times. There really is no "R/C Car" about it. Just like rails are hitting above Cliff's speeds.

Anyways, I guess everyone's proved me wrong with that Salt flats thing. I'll shut up now.. LOL

-Todd

[NotWalkinBlind]

300 ft. isn't a lot of room.... it's the length of a football field... but the cars will be allowed to approach this 300 ft. area from turn four at a flying start, right? I just don't think it will take these cars a long ways to reach terminal velocity... guess it depends on the gearing, but if someone could calculate the power-to-weight ratio of these cars, I'm sure they'd be in a range similar to top fuel dragsters, and if you gave one of those guys a running start at a half mile or more, there's no telling what they could do with taller gearing... and I'm sure they'd reach terminal velocity really quickly with all that horsepower.

I think the problem with the R/C cars is gonna be tires holding together, and keeping them from becoming airborne... or keeping them from bottoming out and scraping the noses of the bodies due to downforce.

[rc10gtisthebest]

One thing I don't Like about how speed is going to be determined Length/Time stuff is because the car will still be accelerating through the speed trap. So if they enter at like 120mph and exit at like 170mph it will end up calculating to liek 155 or something.

[gsglassm]

Here is a 200mph vid.

http://www.seeuhome.com/rctruck/200+mph_nitro_cwh.wmv

[ajg]

My car reaches 70mph in less than 100 ft. But my car is VERY light.

[mgs9]

At 150+ is it even possible to turn? There would be so much wind residance and alot of down force to keep the car on the track at that speed.

[racerrandy]

PeterV
Moderator Join Date: 06-26-2000
Posts: 86

Vehicle speed will be measured by running the car through an electronic speed trap (likely to come from Race America), and you can use as much of the speedway as your radio range will allow to get up to speed.



If you would read the main thread, most of your questions would be answered. Or try using the search function.

Later, Randy

[ElectricThunder]

Here is a 200mph vid.

http://www.seeuhome.com/rctruck/200+mph_nitro_cwh.wmv
As stated before, that's not an RC car. That's a tether car. Tether cars can get up to insane speeds yes, but all they do is go round in circles and can't be controlled at all. Has nothin to do with RC. ;)

[mab_man20]

Here is one thing that i dont get. Maybe im dense but an explination would be appreciated.

the current record is 111mph. Granted i think that was an average speed, why does everyone think that 200mph (almost DOUBLE the current record) is attainable? People are throwing around 150 mph like its no big deal.

Im curious to see how many people will break 100 mph, but im watching intently.

:)

[mooey1232003]

While laying around this morning, I was pondering this burning question. Is 200 mph really possible on an oval. I truly believe; NO!!! I do not ever see r/c cars hitting 200 on a flat oval track. Now, if we could only run these at the salt flats, with a chase car... THEN MAYBEE. I honestly don't believe they will get much faster than 150-160. You have to realize that as speed increases, the drag multiplies much faster. So, you need increasingly more horsepower to go faster and faster. The biggest factor in this competition is having to turn left at the end of every straight.

Let me know what you think about this.

anything is possible

[Sparkey_STi]

As stated before, that's not an RC car. That's a tether car. Tether cars can get up to insane speeds yes, but all they do is go round in circles and can't be controlled at all. Has nothin to do with RC. ;)

Your not really getting it tho... if it is possible for just some little thing that only goes in a circle to get 200.. why cant a real Rc car? You just have to know what your doing...

If i had the money, id go with a Orion 2T v2, m18, full cf drilled chassis, KO Mars. Id be running on the rims after the first 2 seconds, but untill then id at least hit 100...

[lpstageii]

Your not really getting it tho... if it is possible for just some little thing that only goes in a circle to get 200.. why cant a real Rc car? You just have to know what your doing...

If i had the money, id go with a Orion 2T v2, m18, full cf drilled chassis, KO Mars. Id be running on the rims after the first 2 seconds, but untill then id at least hit 100...

The problem is, the centrifugal force of that tether car is being held by the string. You cut that cord and that tether car will do what any other r/c car would do... A real r/c car would have to be able to take the corner at the afformentioned tracks at 150+ then accelerate down the straight to hit 200 mph. That means going from 150-200 in about 2 seconds or so. 200 mph would only be attainable on in insanely large strip of perfectly flat land. The wind resistance increases exponentially and at those speeds 4 - 6 horsepower isn't near enough to go 200 mph. Power/weight ratios play a larger role in low speed acceleration. Once you get in the 150 mph range, horsepower, frontal area, and wind resistance play a larger factor than anything...and they are all working against you in this case.

[Sparkey_STi]

Ok, but i dont care about turning. This is a stright run. Not many cars are going to go around the corner at high speeds, i also highly doubt any of these cars hitting over 150 MAX.

[lpstageii]

Ok, but i dont care about turning. This is a stright run. Not many cars are going to go around the corner at high speeds, i also highly doubt any of these cars hitting over 150 MAX.

Read my post again. I said it may be attainable on very large, flat surface. The problem is, the cars in this challenge (remember...the topic) will have to turn. I don't know why you say you don't care about turning anyways...that tether you cited car is turning the whole time (albeit by a string). The reason they are tethered is because there isn't a practical place to test these cars for top speed...if there was a better place than an oval track, they'd use it.

[extremetmaxxer]

you know what, if a top fuel drag can go from 0-300 in 4.5 seconds

i think we can get an rc car to do 200

i have no technical data to back up my claim but im just going to believe
:D

[tphss]

I belive speeds above 120MPH can be reached with a Drag/Funnycar type of R/C car, using some extreme hard modifications in the engine department and aerodinamics/downforce department, as well as traction and all things following.
And I belive only a car in scale larger then 1/8 (1/6, 1/5, 1/4) can reach speeds even close to that, smaller will be impossible to control and impossible to work mechanically wise.

[astainback]

I wish there was a pool running on whether it will be a factory team, individual, or team that does it, and what the top speed will be. 5 bucks a head, winner/s take all.

sweet.

[Mike Keeney]

I share the belief that a drag racing style of car has the best chance of winning. The critical component shouldn't be raw horsepower, but rather traction, aerodynamics, and tire integrity.

I know that the electric cars can turn some impressive rpm's, but that doesn't mean they can convert that power into forward momentum (in the space alloted). Since I know nothing about high performance electric cars, I can only speculate that topping 150 to 200 mph could only be done by the engine operating at, or exceeding, its maximum power output. I don't believe that internal combustion engines have the same limitations. The power IC engines produce range from fractional to thousands. I'm confident that my blown V8 running on nitro will develop all the power needed to easily break the current record. In fact, I'm confident I can make enough hp to pass 200 mph. What I'm unsure of is getting that hp to the ground. Nobody knows how to do this yet.

If the track had unlimited straight line length, then I think it would be a completely different game. You would start seeing cars with extremely low drag coefficients as the top contenders. Until then, I think the prize will go to whoever has the muscle to get up to speed in the shortest space. Aerodynamics will be important, but far from perfect. These cars will use aerodynamics to provide downforce, and muscle to instantly get up to top speed. But, the drag cars will be susceptible to the same demons as their full sized counterparts. Traction will be extremely difficult, and mechanical components such as tires and engines are considerable more vulnerable to failure. That's why I firmly believe that there's no way to accurately predict what kind of car will win. My 2¢.

Mike Keeney

[DaFF]

Hey Mike, I wonder how you find the time to work on your car AND be so active on this forum LoL

Keep-up the good work !

DFF

[Mike Keeney]

Don't have a life. :D

Thanks,

[traxxas-dude]

I dont believe power is an issue, its more of a traction thing. I dont know if any of you know about REAL pocketbikes, but they have 6HP engines, and are capable of propelling a 160lb man at over 70mph. I think R/C's have easily the power/weight ratio needed, but getting that power to the ground effectively and efficiently will be the problem.

Thats my thinking anyways :)

[minitdriver]

I don't think 200 is possible now.I think that an electric will post hte fastest time because they start power early in Rpm amd keep it going for a long time.Although a combustion motor could do it I don't think it will.Tires are a big issue.If you get even past 120 they will balloon beyond beleife.Foams will get torn up and ground to the rim.Traxxas-dude makes a desent post that I hope someone that has tried putting those motors in RC cars can answer because on this first page of this thread I give a similiar example hoping for a reaction and got nothing.
Ken

[DCLXVI]

i personally dont think it would be possible due to the fast the tires i dont think would hold up to that kind of revolutions let alone the bearing on the inside of the hubs.... any kind of looseness you have in the steering would be so over exaggerated at that speed that it would have to be completly solid no possible slack at all.as for the body it would have to sit so low at that speed that the suspension when at a stop would be like a 1/4" above ground and as speed increases and downforce is compressing the suspension that it would be dang near scraping the ground.you sneezed and it would be all over.as for turns unless you got some serious angle were talking like a huge bowl i dont think it will be possible as like it was said befor youd have to slow down for the turn you would need a actual track freshly paved smooth as glass about the size of indy i would guess at...as for gearing lol get out the bicycle sprockets and modify them as for the speed run rcca did lomg time ago if i recall correctly they had to have one specialy made for this purpose.maybe i shouldnt be typing this but i dont think it is possible to do so on the ground with a rc vehicle maybe a dragster but i doubt even then would it be possible...

Well, why not mount the body like on the 1/8 scale on-roads...on the A-Arms...that way, all the downforce from the body goes directly to the tires without having to compress the suspension...

[GA Maxx]

with the technology now, I dont believe 200mph is possible, except for those cars that go round on a string

[RC-scientist]

So Mike you want to have a pink slip race when we go to Irwindale?

[patcook]

Going 200 might sound a little crazy, but I do think that it could be possible. When you think speed you're thinking of rc specific engines and bodies and parts. A car with a 20 horsepower engine like a pocketbike engine that's only 50cc could be pushed incredably fast. I've seen video clips of pocketbikes going 85 and 90 with a 175 pound guy riding them, so just imagine if you could get enough traction and arodynamics to keep it going. Pocketbikes are also water cooled, so keeping the engine wouldn't be to bad if you just mounted a radiator. There also a single speed just like a standard rc car so it would be easy to change ratios and things with all the parts that are available for them.

the other alternative would also be to put a shifter go kart engine into a car, and then figure out how to work the clutch and shifter along with the throttle, steering and brakes.

[NotWalkinBlind]

200 mph in an R/C car is definitely possible... but I dunno if it's possible at Irwindale.

Basically, it will be interesting to see what the fastest car is that can slow down enough to keep from splattering against the wall in turn one.

[Cosmo]

the other alternative would also be to put a shifter go kart engine into a car, and then figure out how to work the clutch and shifter along with the throttle, steering and brakes.

You wouldn't need to do that. There are several kart engines (single speed) that make more than enough power. The kart I race has a Parilla 100cc engine that puts out 43 hp. With me in it, the kart weights about 420 pounds. I can easily reach 130 mph on a large track. And this is with short track bodywork that is not very aerodynamic.

[goldtj]

Err.. might get flammed for this but couldnt u use 4 wheel drive to solve the traction problem? Or run more than 4 wheels? Running more than 4 wheels would help the traction probs and the tyres are a lot less likely to disintegrate in the turns with the load distributed between more of them.

[losifreak107]

with more than 4 wheels you get alot of rolling resistance from the tires hmm... you wouldnt need to get to speed fast if you didnt have to slow down for the corner. and how fast do the nascar machines go on this track?

[Speedtester]

Im willing to bet they go around 90-120mph on the corners.

with more than 4 wheels you get alot of rolling resistance from the tires hmm... you wouldnt need to get to speed fast if you didnt have to slow down for the corner. and how fast do the nascar machines go on this track?

[goldtj]

with more than 4 wheels you get alot of rolling resistance from the tires hmm... you wouldnt need to get to speed fast if you didnt have to slow down for the corner.

If u can take each corner fast then u dont have to accelerate as much on each straight. So this becomes a trade off between rolling resistance vs traction and hence cornering speed. Im willing to bet that u could corner a lot faster on 6 wheels and not have too much extra rolling resistance.

I think that the sheer power that would be required to accelerate from a speed that 4 tires could hold in a corner, to top speed on the straight, would make 200 mph very hard to acheive.

[Mike Keeney]

So Mike you want to have a pink slip race when we go to Irwindale?
Hmmmm..If I honestly knew who or what would be the winner, I'd still turn down the pink slip bet. Anything can go wrong and I'd hate to lose a car that I've invested several thousand dollars into.

The engine my car will be running does not exist yet. I am designing a brand new motor from scratch, along with everything else for the car.

Do I think my car will be a contender, yes. Am I positive I will be the ultimate winner, nope. There's too many ideas out there that have a good chance of taking the prize. That's what's so exciting about this contest. Nobody is going to get a free ride.

I'm rooting for everyone! :)

Mike

[rpmmaxxed]

Why are so many of you concerned with traction? Nearly all of the cars will be geared so high that the power that they do posess will not come into effect of spinning the tires.

Even in the one or two turns that will be encountered, I see no problem with the cars hitting them at speed, and the natural push into that turn will be controllable.

THe only tire related problem that I forsee occuring will be with tire integrity. The only tire that I will run will be solid rubber. Yes, alot heavier, but much stronger.

[69dart]

you guys might think i am crayzy but with my tc3 when i had my team orion 6x2 motor in it it did about 60 mph and i used jaco purple foams
i had no issues with traction
yes that is right foams on concrete and they didnt chunk they lasted a long time actually
and i would lay some pop/water mixture down at the start for about 150 feet or so
so it is sticky
that is what i did
i usted to drag race my freinds in this church parking lot and that is what we did so y wouldnt it work for this event

[skip m.]

One thing you guys got wrong here is that there are NOT going to be chase vehicles. Your going to be standing in the Flag Booth controlling the rc car. Also most of the Purpose built rc cars have very ****** handling. So they won't be able to negotiate the turn at all.

I believe 150 is possible but not 200. If I wanted to do 200mph I would go to the Salt Flats with a PCM radio with Alkaline Batteries in it So I can use as much room as humanly possible.

Chase vehicles are a bullcrap cheating machine. No record should be consider where a chase vehicle is being used. This is just my point of few.

-Toddnow how do you expect to see the car when your 1/4 mi let alone 500' away??

[mtrsprt]

To answer your question. No.

You won't see anything over 125mph.

[Mike Keeney]

To answer your question. No.

You won't see anything over 125mph.
I'm curious as to how you came to this conclusion? I believe we'll see plenty of cars over 150. I certainly think we won't see an "off the shelf" car hitting these kinds of speeds, but hybrids specifically designed for this event will overcome the obstacles.

My 2¢.

Mike

[vtl1180ny]

I've been reading all this and the wife even agreed that we could enter... I'm pretty positive we are not going to see 200 mph at Irwindale. There just isn't the room to be able to gear the car low enough to be able to hit those speeds... Remember, we're comparing vehicles that are 1/10th, 1/8th and maybe some 1/5th to 1:1 cars... So if a 1/10th scale is doing 100 mph that is the same as a 1:1 car doing 1000 mph... I can tell you from experience what a pebble can do to a 1/10th car at 80 mph.... I have a NTC3 capable pf hitting 85 mph, my last run with the car it decided it was an airplane and nosed up, it got a good 5 feet of air before it went tumbling down the lot...

Aerodynamics are going to play a huge roll in this, pun intended...

I'm forseeing a lot of broken and unrecognizable machines as well as a few fires... Not that this won't be fun though....

[Kel]

I, for one, Think It's very possible. The Biggest Challenge is going to be coming up with the power to do something like that. If you read this article (http://www.rccaraction.com/articles/need_speed.asp), then you'll see that speeds of that magnitude require immense tuning, and silly input for control.

I'm not sure that a 1/10th scale Vehicle could take this kind of speed, but you never know.

Personally I'd try to hit it with a larger 1/5 scale that's much heavier so that It will be more stable on the long runs. The larger cars don't respond as fast or "twitchy" as their popular 1/10 counterparts, so They will inevitably be easier to control at comparable speeds.

The hardest part of the challenge, once you have the power, is just doing the math. I'm thinking custom 4-speed or something like that, and that's going to require some serious CAD work. Also, the ratios will have to be calculated just right to provide the ideal push from each gear.. It'll be a project that's weeks long!

But of course, I suppose that's what will be required of the fastest RC in the world..

Cheers,

-Kel http://forum.rcm-rc.com/html/emoticons/cool.gif

[vtl1180ny]

I'm not rich enough to sacrifice my Technokit for this....

[minitdriver]

Im still saying no way!A 4 speed in a 5th scale???Are you new? Don't mean to be rude but although big don't have alot of room on the chassis.Could someone make a tranny for on? Sure I wouldn't doubt it but you don't hear about trannies on 5th scales or go peds( same engines) but why put a 4 speed in 1?Most good 5th scales do 60 nearly stock!Add a good pipe and air filter and alittle different gearing and you can squeeze 80ish.Make just a 2 speed and you can easily do 100.Do more motor work( bore and stroke) and get some good race gas and woowee!Watch your hard work pay off after a couple runs.Believe if I could enter this challenge and had a good job(or at least A job) I would do it but, ah well.
Ken
P.S. is anyone bringin' a Mini-t?? Would love to see one going for speed LOL

[CENthasizer]

I'm wondering how many people will bring their off the shelf cars just to see how fast it really is, and for a laugh.... Although i wish someone could hit the 200 mph mark, i am going for the fastest @ 182mph anyone want to place bets?:)

[NotWalkinBlind]

I can tell you from experience what a pebble can do to a 1/10th car at 80 mph.... I have a NTC3 capable pf hitting 85 mph, my last run with the car it decided it was an airplane and nosed up, it got a good 5 feet of air before it went tumbling down the lot... Was it a pebble that caused it? What body style?
Aerodynamics are going to play a huge roll in this, pun intended...If ya didn't intend the pun, why did you use "roll" instead of "role"?
:D :D :D
:D :D :D

[Piggy89373]

In order for those speeds to be attained, major renovations in body design would be necessary. I foresee lots of cf bodies, possibly fiberglassed for added aerodynamics. Even with that, I don't believe the 200 mph could be broken. The amount of force exerted, even given aerodynamics, would put way too much pressure on the vehicle and and blow the wheels to shreds even on solid rubber tires. The aforementioned horsepower necessary to overcome this force is not yet attainable in a small RC car. Now, if all people were doing was making the first turn to start the clock, and running wide open without having to worry about any other turns and lawndarting into the wall, then the 150 mark would easily fall, maybe even the 170 mark.

[Kel]

Im still saying no way!A 4 speed in a 5th scale???Are you new? Don't mean to be rude but although big don't have alot of room on the chassis.Could someone make a tranny for on? Sure I wouldn't doubt it but you don't hear about trannies on 5th scales or go peds( same engines) but why put a 4 speed in 1?Most good 5th scales do 60 nearly stock!Add a good pipe and air filter and alittle different gearing and you can squeeze 80ish.Make just a 2 speed and you can easily do 100.Do more motor work( bore and stroke) and get some good race gas and woowee!Watch your hard work pay off after a couple runs.Believe if I could enter this challenge and had a good job(or at least A job) I would do it but, ah well.
Ken
P.S. is anyone bringin' a Mini-t?? Would love to see one going for speed LOL

I say yes. It might not top 200 that easily, but anything is possible.

And am I new? To these boards, yes. To RC? Absolutely Not!

As a matter of fact, I volunteer my company to make a tranny.. Maybe a one-time piece somewhere in the future... RCM RC Products.. If you haven't heard of us then start listening ;)

But anyway, I see what you are saying and where you are coming from.

It is possible, just with planning and more planning.. Oh yeah, some planning!

-Kel

[winning edge designs]

Has anyone considered the little tiny tires we use? If good year can't make a top fuel tire, that's 38 inches in diameter sustain 300+ for 5 seconds(2,600+ rpm), how can a 3 inch tire be expected to run 200mph, or even close?.....(an R/C tire with a 5 inch circumference would need to attain approx 42,000 rpm!)....Off the top of my head, :)........Jim

[Kel]

Good Question.. Solid Rubber? :D LOL

[winning edge designs]

Another thought, maybe danger........5th scales have much more frontal area, mass, etc. so attaining high speeds is actually harder then it would be with a 1/10th scale. Easier to drive, yes, harder to make enough power, yes.

For example, in a fullscale car(this would apply to scale as well, fairly closely), if 100 hp equals 100 mph, it may take 200hp to attain 150, 400hp to attain 180, 800 hp to attain 220, and so on. Speed and power are not linear, simple physics, this is without aero changes and not accounting for a vehicles ability to even attain high speeds. The worse the aero, the faster the hp numbers needed increase. Then parts start to come off......it sure would be fun to try though....Jim

[winning edge designs]

Solid rubber, maybe, but then were giving up the traction needed to do it.....plus added reciprocating weight...hhmmmm.....maybe larger then normal scale tires will eventually be needed if we even get close?

I'm going to look and see if an R/C airplane has even gone 200 mph in a level pattern?.......Jim

[Speedtester]

Of course planes have gone way over 200 in a level pattern. I probally have some video of jets somewhere on my computer with onboard flight data records. I cant see a R/c car going 200mph for a long time.
My top speed guess is going to be 140ish mph.


Solid rubber, maybe, but then were giving up the traction needed to do it.....plus added reciprocating weight...hhmmmm.....maybe larger then normal scale tires will eventually be needed if we even get close?

I'm going to look and see if an R/C airplane has even gone 200 mph in a level pattern?.......Jim

[winning edge designs]

Ahh, ok, cool. I've seen some ducted fan jets that were clocked at 160mph, but they were scale, not really light, etc. So i'd assume they did, just trying to imagine if an R/C plane isn't going easily over 250-300, it will be tuff for a car to come anywhere near 150...just based on physics.......:), Jim

[moddedsnrally]

Here is a 200mph vid.

http://www.seeuhome.com/rctruck/200+mph_nitro_cwh.wmv

if you watch the flying object at about 57 seconds, and it looks more like a bird if anything, and the bird is flying faster then a normal bird flies, so i have to say the movie was accelerated. But i wouldnt doubt the fact that most of those things go pretty quick.

Also dont forget, that once a car reaches a certain speed it may not be able to accelerate any more because of the shape of the body. Its like a "terminal velocity" where it prevents the car from accelerating any faster.

[EddieWeeks]

www.corpcomp.com/weeks1/movies/Isobar_at_Lumberton.WMV

This is a video of a jet I designed years ago.. As far as model jets go its
fairly slow.. In the straits its going about 170 mph and in the turns ~ 120 mph
The fastest its ever been is 210 where I ran full power for 8-10 sec strait and level.

My friends newest plane will flat out smoke my Isobar.. I clocked him at 237 mph
and he was not even trying. The AMA has limited us to 200 mph..

These planes take up a lot of space..
As far as I can see in both directions in just a few sec.....

My point to all this is these cars a 4 times smaller and are hopeing to go allmost as fast.. It will not be easy..

www.corpcomp.com/weeks1/Isobar/2.jpg

This is a pic of the plane on a 8 foot table.. Its a big plane.

Eddie Weeks

[Speedtester]

How is your project coming along Ed? I cant wait to see that thing go.

[Wr95jp]

Ok, my 2cent
200 mph i dont think so not out of any car under 1/4 scale. yes i have seen 100 mph
out of a rs4 on a airport runway. If they break 125 ill take back everything but my rs4 is slow i know it at best i have gotten 24mph with 2 speeds im no expert but i just think speeds over 70 on a oval track is hard to do So thats my 2 cent and i should of kept them but i love to share.

[winning edge designs]

Eddie, cool pic and video. The planes I saw in Broward a couple years ago weren't very quick compared to what yours looked like. But I remember wondering how much fun it could be to have to turn it back around every 3 or so seconds, LOL.

We have to add in bumps, rolling resisitance, weight(cars are heavy or they turn into planes by mistake, LOL) and drivetrain friction, etc.............high speed is that much easier in an airplane........It sure would be a blast to watch someone try to go 200 in a car, :)....Jim

[e89trigger]

i wonder if rockes are allowed to stop the car like small modle rockes???:confused: