sp12M u-force 75 lehner 5300

[jasper]

:eek: Hoi, i,m new to the forum. been reading a lot about brushless in here

Just ordered the lehner and schulze and will be in next week.

after first test run i,ll post pictures and impression. :D could be testcrash :D

greetz from the Netherlands ;) jasper

[studysession]

I want to see pics if you have them. Where did you order it from? Post a link please.

[jasper]

hey studysession

I ordered the u-force from hobby-in, a local modelflight shop, 20 meters away from my home
his site: http://www.xs4all.nl/~hobbyin/

the lehner part I ordered in germany, by postorder from rc-motorradshop
his site: http://www.rc-motorradshop.de

both parts were ordered some more than a week ago but still nothing has been delivered!!! :(

so no pics yet, still need to get my first testrun

this is gonna be my first brushless experience, hope you have some tips and tricks?

greetz, jasper

[DaFF]

Hey Jasper,

I did order my Lehner motor from the same place, Das Motorshop is a good shop, the owner is serious and friendly. I have nothing but good thing to say about him.

Took me less than a week to receive the motor ( I am living in France )

Didn't know the place where you order your esc... how much was the UF ?

L8ter

DFF

[jasper]

Daff, I dont no prices yet. Ordered the computer plug as well. But i dont think it will be cheaper than other shops.

What car are you running? a 12th scale? I think whith brushless such a car will be a
little missile. Can you give me a hint about performances with this set-up?

Is the basic 5300 a good choise? cause its not a torqy motor.

groeten ***

[studysession]

What car you putting it in jasper?

[jasper]

hoi The car is a corally sp12m its a 12th scale pancar www.corally.com

If i am correct its the current european champion www.overrc.com take a look
at this site there is more information about building this car.

I want to go brushless becouse i think i will have performances better than expensive modified brushed motors.

I will be driving this car during winter season on indoor carpet tracks just to improve my driving skills. dont want to compete whith this car.
Next summer i plan to compete in the 2wd off-road class(no brushless :( )

And also no lipo,s just 6-cell ni-mh packs

www.pkracing.nl here's a indoor track where i will go to.


thanks in advanced Jasper :)

[studysession]

Nice - Thx

[DaFF]

Jasp,

I am running a 1/10 scale HPI Pro4.

The performance with my setup is excellent to say the least. Accel is slightly better than high end nitro, top speed is on par, handling is better ( less weight )

Run time is around 15 minutes on racing condition.

I am still fighting with the lipos, it is my second pack that I destroyed but I've learned a lot and I know what needs to be improved to run them without failure.

Anyway, on 6 cells the 5300 will be more than enough to propulse your little 1/12 around your track. Furthermore, seing the tight indoor setup where it is going to run, I see no problem with the 5300.

I would recommend to gear your car low to keep the Amp draw under control, get more runtime and more low end torque - I don't think speed would be your main concern on this track, you'll have your hand full anyway with this setup -

Keep us posted and show us some pics !

Good Luck

DFF

[studysession]

DaFF - How do you keep destroying your LiPo's? I have 9 cells at the moment. I am going to put inline fuses so I can't draw to many AMPs from the packs as a safety precaution.

[jasper]

DAFF thanks for your information.

will post pictures as soon as possible.

Anybody else driving brushless in 12th scale?

Jasper.

[studysession]

Not 12th scale - but I am running them in 1/18-1/10 and soon to be 1/8 scale.

If I had a 1/12 scale then I would be running that as well.

[DaFF]

Study,

my Lipo cells where destroyed because:

- slight impact on corner of a pack leading to 2 cells bulge and pack voltage going to 0 volt.

- failure of cells tabs that I believe occured because of the way I strapped them onto my chassis.

It wasn't really because of the Amp draw ( or so I believe ), I will have a confirmation of this when I will hook-up the Eagle Tree system on my car to get true Amp and voltage number.

DFF

[studysession]

Cool - I would like to get the eagle tree system myself. For now I have a watt meter for planes coming. It will tell me voltage/amps/watts that I am drawing but none of the extra stuff that the eagle tree gives you.

Thx

[jasper]

Studdysession, try a 12th scale pancar its really fun driving them.

Your 8th scale is it off-road that would be really fun!

the brushless set-up, will it be powerfull enough for those big heavy cars?

At the modelflight shop i have seen sheets of carbon-fibre wich you can mold in every shape you like. But it's very expensive and you need skill's and some equipement.
But it will save weight if you make a chassis from that.

Wonder why nobody is interested in 12th scale.

Jasper

[studysession]

I dont have funds to go 12 scale right now. Right now I am looking into what tracks are closest to me. They only have 10 scale onroad and offroad. And for nitro they have 1/8 and 1/6 and 1/5 scale. No one has 12 scale classes locally.

I am going to convert my buggy to be brushless instead of nitro and race with the nitros. I would like to put my 1/18 scale up against the 1/10 scales but no one is willing to let that happen. On my website shows a Micro RS4 in one video and a XRay M18 in another video and a nitro NTC3 in each video can not keep up with the 1/18 scales electrics at all. :)

[jasper]

studysession, is your buggy 8th scale? will my combo be strong enough to drive such a car?

[studysession]

Yes it is 1/8 scale. I have a Hyper 7 and an OFNA 9.5. The 9.5 is on EBay with no engine right now. Still in new shape. I took the engine and put it in my Hyper 7 before I had really any chance to use the 9.5 and figure it just sits. So I am selling it. If it does not sell then I will also convert it to electric.

As for what is better for an electric 1/8 scale. Check out this thread:
http://www.radiocontrolzone.com/forums/showthread.php?t=161348
It is very helpful for converting a 1/8 scale to electric.

Hope that helps.

[jasper]

Hi guys, no pictures yet but the schulze has arrived today :) :) :)

It looks and feels verry solid.

Bad news is i maybe have to wait until the 19th before motor arrives :mad:

that's all for the moment.

ps, controller and pc-connection has costed me € 334,50. same as other shops.

[jasper]

Hi guys, still no motor.

I have been reading the instruction manual from the u-force.
They are talking about neutral-point 0.8 ms... 1.8 ms , full-power 1.3... 2.5 ms.
I can't figure out anything that has to do with the seconds.
It's possible to change these parameters,but what do i change and why?

Please advice

[studysession]

Why does it take so long to get the motor?

[TheSteve]

Hey Jasper,

You can change the endpoints manually - but it is tough to determine what parameters to select unless you have an Oscilliscope to measure it.
There is an easier way though, use DIP 2 to learn the end points, then when you read the profile using U-soft your parameters will be there and you can see the exact ms of your full speed, neutral and full brake.

Hi guys, still no motor.

I have been reading the instruction manual from the u-force.
They are talking about neutral-point 0.8 ms... 1.8 ms , full-power 1.3... 2.5 ms.
I can't figure out anything that has to do with the seconds.
It's possible to change these parameters,but what do i change and why?

Please advice

[jasper]

ah,thats easy. I thought you had to customise the time the motor revs up,so the rotor can keep up with the magnets.

I hope you understand what i just meant?

The motor should already be here, somewhere something went wrong with shipping.
Unfortunatily the shop owner is on holiday untill next monday. when he's back he will start an investigation.

My patience is challanced.

[jasper]

hello, motor has arrived today!!

Built it in the sp12m and went for a test drive at my parking lot. the 12m has a ride height off 3 mm. and the foam tires had no grip at all. So that wasn't a succes.

So i took out my x-ray for a ride with the u-force and the lmt 5300.

I have a little problem installing the powerplant into my sp12m cause off the big 4mm wires and the inflexible motor wires. They are leaning on the moterpod which causes the motorpod to tweak. there are connectors which have a hole at the side, so you can connect wires on the side instead of on top of them. using them will decrease bending and so tension on the wires. but i will fix problem later.

It's a long time since i've driven a rc-car, so i was excited about this first run with my new power module. I was surprised about the top speed,no numbers, but way faster than anything i had ever controlled. acceleration could have been beter,but maybe i should have changed the settings.The breaks were really amazing, stopping power enough!!

I also think motor and controller were a bit too hot. Can anybody give me the best configuration for this combination?

The world has a new brushless addict, and its me!

[studysession]

Yeah - I hate the inflexible wires on the Lehner motors. I have the 5300 and using it for tuning purposes this weekend. Nice little motor - But the wires should flex more in my opinion. ;)

[jasper]

PHOTOS!!!!!!


Lowrider whoops :D

http://img66.exs.cx/img66/3202/motoschadeab.jpg
http://img66.exs.cx/img66/3526/ab12mtop.jpg
http://img66.exs.cx/img66/9391/achterkantab12m.jpg

[studysession]

Very nice Jasper - Mine gets scratched up on the bottom as well. I take my touring car on and off the curbs like a mini jump and that scratches it even more.

[jasper]

another try ;)

[jasper]

and yet another :D

[studysession]

What gear ratio are you running?

[jasper]

Last thursday at the track i have used two different pinions 13 and 15 and only one spur 78.

Roll-out was 27,2 with 13 and 31,4 with 15.

The car weights only 990 grams drive ready!

My badly treaded saddle-pacs are 3000 maH and with these i had runtimes from 15 minutes.So average amperage was 12A.
With this low ratio the car was still too fast at the track, havent been driving for a while and just hidding the boarders on every corner.But after 3 packs i was improving and set my personal fastest lap ever. 10,546 sec.

I was thinking about top speeds.

roll-out revs speed pinion/spur

27,2 38160 62 km/h 13/78 tire diameter 52 mm
31,4 38160 72 km/h 15/78 7,2 volt x 5300 revs
41,9 38160 95 km/h 20/78
50.2 38160 115 km/h 24/78

so what will happen iff 10,8 volt x 5300 revs = 57240

a large rollout 58,6 and then it has a top speed 201 km/h= 125 m/h!

becouse it is a light car and direct driven i think this is not
impossible.

But thats just for playing around not for the track.

At the track both motor and controller stayed cool, but my tires lost grip half way the session.So i wont be needing 3000 packs. 1700 pack will give me 8 min runtime which is normal.

All other racers were interested in my brushless combo, no one ever seen the u-force bevore. Brushless scene in The Netherlands is not big.

All i can say is, i can now improve my driving skills with the sp12m with power on demand,and no bad things which comes with brushed motors.

houwdoe!

[studysession]

Yeah - a lot of people here are not big into brushless either. THat is all I run on my electrics. I will run brushed motors in my MiniT or something like that but not my touring cars.

Even my Micro RS4 has a 540 size Lehner 5300 basic brushless in it. It is scarey fast.

[jasper]

:rolleyes:yep but to have a fast car is one thing but to be fast is another thing. It has got to be controlable,thats the reason why im happy with the schulze.
I like power, but what i like more is controling it. I tell you a 12th scale with the power i have now, on a small track, is quite a hand full.
The pro off the bruchless is, every time the same power without maintenence.

Studysession, what do you think off my theorie about top-speed with the 12m? :)

[studysession]

As for 125MPh - with doing speed runs myself. It is not as easy as it sounds. It always comes out nice with just math and theory. But appying it is another and different story.

So far, fastest I have gone is 93MPh. It's hard to control above 60.