my 1:12 R5 + A123 is ready to 佐敦谷

my 1:12 R5 + A123 + 7.5R, 第一次用無刷+A123玩1:12, 唔知咩表現???

what gear ratio/rollout?
A123 + 7.5R should be super fast.

明天我轉用  7.4v 分體 + 7.5r  
現在係  3.14 x  45  x  22    /  97   用a123
轉左7.4v 要再轉roll out  ma?

What was your motor temp when you tried A123 + 7.5R @ 32mm rollout?  
If it is already hot, then you should re-gear for sure.

I would suggest to aim at about 28mm rollout to start. (so use 19 pinion)

i use 94/20, but i don't know that is ok or not???
c-hing, what's gear ratio do you suggest??

what gear ratio/rollout?
A123 + 7.5R should be super fast.
hardmankam 發表於 2010-8-20 18:10

                               
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i think 94/20 is ok to start.
(rollout is about 30mm)

c-hing, i don't know what's "rollout"??
is this tire size??

i think 94/20 is ok to start.
(rollout is about 30mm)
hardmankam 發表於 2010-8-20 21:09

                               
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rollout = pi * (rear tire diameter) * pinion / spur

eg:
tire diameter = 46mm
pinion = 20
spur = 94

then
rollout = 3.1416 * 46 * 20 / 94 = 30.7mm

this means for 1 motor revolution, your car will travel 30.7mm

note:
when you use foam tire, usually refer to rollout
when you use rubber tire, usually refer to FDR

Thks for your information.

for yr ref.... currently using Lipo 2S, 26/89, 8.5T. Rear 46mm dia.

motor temp<50deg

今日試左 6.6v   7.5r    30/94    好很快
                  3.7v    7.5t    30/94    小小快
                  6.6v     7.5r   22/94     好q慢

特別嗚鳴謝hardmankam  c hing教路  
期待明天再片過

用life-7.5R玩幾多分鐘??

今日試左 6.6v   7.5r    30/94    好很快
                  3.7v    7.5t    30/94    小小快
         ...
rcmodel 發表於 2010-8-22 00:17

                               
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Around15 mins

my 1:12 R5 + A123 + 7.5R, 第一次用無刷+A123玩1:12, 唔知咩表現???
tekin 發表於 2010-8-20 17:30

                               
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    ching 邊道買傢o的A123

yahoo....