請問12仔用3.7V Lipo電會用幾turn brushless?

From westerner's forums, people usually run 1S lipo with higher turn motors (like 10.5 or 13.5).  The main reason is because for lower turn motors, it requires a LOT of power from the battery. In single cell lipo, it may not be able to provide that power... causing the battery to fail.

Here is my understanding:
eg: 4.5R motor usually needs 450watts
Power = Voltage x Current  ... so in this case Current = 450W / 3.7V = 121A

In order to provide ~ 120A, the lipo needs to be at least 5000mah@25C.

Note: the current SMC 1s Lipo is 4000mah@25C

Can't see the reason to use 1S.....
abba 發表於 2009-6-25 23:33

                               
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Westerners are trying out 1S + 10.5R.  The speed is similar to 4Nimh + 13.5R
With 1S lipo, the car is lighter and less wear on the tires.

點解唔用30C呢？
pmkpang 發表於 2009-6-26 09:47

                               
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SMC's current 1S lipo is only 25C.   maybe later they will make higher C while have high mah

The problem of 2S is not the weight, but the size of lipo.  If they can make 2S smaller with a high C and high mah, then it is much more flexible than 1S.

如題:
我現在用4cell就用4.5 turn brushless, 但想要回同樣的速度，唔知道用SMC個隻3.7V Lipo要用幾turn呢？ 謝謝！
derek5 發表於 2009-6-24 22:53

                               
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Derek5 C-Hing,

If you want to achieve the same/similar speed for 4NiMh+4.5R, it is better for you to try 2S lipo instead.  Maybe 2S + 6.5R, you would have similar speed.  For 1S, its very difficult to achieve similar speed.

Most people who try 1S is for stock or super stock racing, not MOD racing.

Most of those smaller 2S lipo are only 2000 to 2200mah. I dont know how long these will last when paired fast motors.

for reference: My friend play his RC12 with 2S lipo (~2200mah) + Black pig and can play for 15 mins.

for myself, i play my 1/12 with 2S A123 instead.  (2200mah @ 6V)  I can play for about 15 to 20 mins. per charge. this is with a 9.5R motor