bowl806

Sorry to sound like an idiot and I've seen this posted before but how do you calculate FDR? For ex. 86t spur 16t pinion on a Slash. I feel so embarassed-

slash24

this should have everything you should need.
http://scriptasylum.com/rc_speed/top_speed.html

bowl806

Thanks for that link; My main concern was heat issues.

CraigV

iTrader: (1)

(Spur / Pinion) x TransmissionRatio

For example, an RC10B4, which has an internal transmission ratio of 2.6, running a 72 tooth spur gear and 27 tooth pinion:

(72 / 27) x 2.6 = 6.93 Final Drive Ratio.

Also check out www.comeseethis.com for gearing help.

YoungChazz

And here I always thought F.D.R. is Franklin Delano Roosevelt, former president.

bowl806

lol! Thanks for those who helped w/formula! Still having heat issues though;gear mesh is ok but 220+ degrees is way too HOT! The power and reaction is awesome though!!

CraigV

iTrader: (1)

What vehicle, motor, pinion and spur are you using?

T. Herwig

iTrader: (25)

Don't be embarrassed. The only stupid question is the one you don't ask, after all.

bowl806

I'm running CC 4600 w Mamba pro, 2s, 16/86. I ran it 21/86 and it was hot as hell. Also ran it 90/16-all w/RRP pinions and TRX spur gears.

ronsand

Here is a small gearing and speed calculator (excel spread sheet) I made some time ago. It is easy to use and modify in accordance with your needs. Also it doesn't require a network connection.

It has a few cars in it already (The Car, Xray 808, Xray T3 and the Mugen MBX6).

I prefer it in stead of the Script Asylum one for the ease of use and its availability

Feel free to use it. I have attached a screen shot and the zipped xls file.

Brandon Black

iTrader: (3)

Good job on the spread sheet and thanks for sharing!

ronsand

you're welcome