Look at the RPM per Volt for the 13.5t and find out the RPM with a 4 cell then a 1s and adjust accordingly. Prolly a 10.5? I think the Schumacher site list's speed passions RPM per Volt with there Turn Limit.

I'm sure there is a better way, but that is what I would do since I don't know it. :weird:

Is yeah racing and speed passion the same?

No, Speed Passion is imported by Schumacher and others I think.

Not sure who it's really made by, but I've heard good things about the motors.

According to them the 13.5T is a 3600 kV motor

So a 1s Lipo on a 13.5T will = 13,320 RPM
4 cell NiMH is 4.8 Volts IIRC 13.5T = 17,280 RPM

Novak's New Ballistic 8.5 on a 1s Lipo = 18,500 RPM

Speed Passion Makes a 9.5, I will have to call Schumacher Tomorrow and see if he has the kV rating for it.

Ok so for the yeah racing esc to work with a 1 cell lipo i have to use a booster and up the voltage past that of 4 Nimh cells to work. Is this the case?:weird:

I don't think so, I always knew it to be that booster/rec packs were used to power the servo/PT/reciever. I don't think it boosts the voltage to your ESC/Motor.

I'm not 100 % on that though.

100% correct.

The unfortunate thing re: the Yeah Racing esc is that you've headed off the beaten path a bit...YOU may end up being the guy who experiments with it and figures out what (if anything) will make it work with the 1s LiPo. Thus far the esc's I've SEEN work with the 1s setup are the Novak 4-cell (easiest) and the Tekin RS (simple workaround that supposedly won't be necessary once the new firmware is out). I am aware from my racing friends in Denver that they've figured out how to work around the LRP/Nosram esc's too (probably a similar process to the Tekin). I believe I've heard that folks have made the SpeedPassion work too.

I know nothing about the Yeah Racing esc and know of nobody who runs one. In fact I'd never heard they had an esc until you asked. As I said, I'm guessing you're going to be the test subject.

A booster will not boost the voltage to your motor, only receiver and servo.

I'm asking myself why nobody has looked into the A123cells as a new battery for 1/12th. 2S gives you 6.6V and they can be charged in 15 minutes.
Atm I'm designing a 12th car using those cells as I dont care much for a 1S lipo pack.

A few guys talk about doing it on the thread The future of 1/12th scale... or something like that. Some have done it, I thought about it. Seems like you can do it in a T-Bar chassis, so it appeals me.

Doing a car to satisfy your own curiosity, etc, is probably great but designing one at this point to race competitively (and dream of any sort of commercial success) is going to be like pissing into a hurricane. At this point it appears the decision has been made and 1s LiPo is it.

As far as the A123 batteries, I confess to not knowing a TON about them but for starters even 6.6v (nominal) is way too much. 4-cell / 17.5 (and 1s / 13.5 is VERY similar speed) is really too fast for 1/12 beginners and there's no motor available that would see a 6.6v car running even THAT comparatively slowly. Even a 21.5 would be faster.

Also (and this may have changed) it seems that anybody I'd seen trying A123 cells ended their test description with "if we shortened the race time" because capacity was pretty severely limited. That is decidedly opposite the trend right now since for 2009 all 1/10 classes have INCREASED race time to six minutes. I'm not interested at ALL in decreasing 1/12 race time--8 minutes it's been and 8 minutes it should remain. As it is, we were barely taking 2000-2200mah out of 1s packs running 10.5 at Denver in March so I'd say 20+ minute races running 17.5 could be feasible. Maybe not practical, but feasible...

Hi I have a T-bar 1/12 (12x) and I run 2S A123 on it.
Because of the size of the A123, i needed to config the car to have left side: battery, right side: ESC+Receiver+Weights(~60g).

With this config, the L/R weight is about right. the body just fits.

I run the car with a 11.5R @ 6.6V, with rollout ~ 34mm

yes, the car runs for 20mins and the A123 can be fully-charged in another 15-20mins.

BTW: I am just driving this car for fun only... I am a newbie and NOT into competitive racing.

http://bbs.rc-evo.com/attachments/da....jpg.thumb.jpg

hardmankam - Thats pretty cool, Who doesnt want to run 20 minutes and only charge for 20 min!!!!!!!!! Its an unusual layout but if its balanced who cares. What is the total weight of the car?

What is the weight difference between the 1s Lipo and 2 A132 Cells?

Hi guys,

In my track, the electric classes been raced are :

- Touring 1/10 (13.5 brushless, 6 cells nimh batts)
- Mini Cooper (27t brushed, 6 cells stick packs, fixed pinion for all)

Now, im trying to get the people to race 1/12 scale (asphalt track, outdoor), can you more or less give me ideas on which way organice a nice set of rules (technicals) for low-budget-and-fun 1/12 class ? (i mean, motors, cells, etc ?). Im imaging like 8.5, 10.5 brushless or 13.5 brushless and 4 nimh cells.

thanks guys !!

Pat

hey
 

hey guys i have got a cyclone 12x and i have got

.a gtb 4 cell speedo with a 4.5 brushless motor

.and 4200 east power infinity battries

.a ko servo that costs over £150

.and an acoms reciver

i just wanted to know if i can use lipos with this or not it is one of the fastest things i have ever seen but i want it to go faster:deathstar at the minet it is geared 14t on a 84 spur so it is the best at acceleratin:eek::eek:

can i use lipos or not?

thanks mike