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Matching speeds of different brushless motors with FDR.

Matching speeds of different brushless motors with FDR.

Old 12-13-2010, 09:06 PM
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Default Matching speeds of different brushless motors with FDR.

Is it possible to match speeds of cars using different brushless motors by enforcing an FDR for each turn motor?

I have seen some VTA rules say you can run a 21.5T motor with a FDR of 4.9 against a 25.5T motor with an open FDR. Thoeretically matching the top speeds.

Given the different motors, same ESC and matched top speed is there still an advantage of running the 21.5, other than cooler running?

Is there a way you can match other turns of brushless motors?
Is there an excel file to do so?

Further to this. Is there somewhere that compares brushed motors against brushless?
Namely an equivalent brushed motor run on 6cell NIMH compared to a 21.5T brushless.

Last edited by mini696; 12-13-2010 at 09:16 PM.
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Old 12-13-2010, 09:59 PM
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Further to this. Is there somewhere that compares brushed motors against brushless?
Namely an equivalent brushed motor run on 6cell NIMH compared to a 21.5T brushless.

+1, -I too would like to see this
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Old 12-13-2010, 10:05 PM
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the problem is not the top end but the bottom and mid range. I can take a 7.5 and run boost on it and run the same lap times as a 4.5, BUT the 4.5 comes off the corners so much harder that if he is behind he can pass easily, slam on the brakes at the next corner and I'm left out in the cold, same with when I'm behind, no way can I pass him unless he make a mistake. and this is with the same lap times. I know your taking about slower motors then this but the same issue will be there I would think.
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Old 12-13-2010, 10:15 PM
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Originally Posted by skypilot View Post
the problem is not the top end but the bottom and mid range. I can take a 7.5 and run boost on it and run the same lap times as a 4.5, BUT the 4.5 comes off the corners so much harder that if he is behind he can pass easily, slam on the brakes at the next corner and I'm left out in the cold, same with when I'm behind, no way can I pass him unless he make a mistake. and this is with the same lap times. I know your taking about slower motors then this but the same issue will be there I would think.
I thought that might be the case.

The reason I ask is because we are starting "VTA inspired" onroad racing. Until everyone can buy the "stock" motors we will allow them to run what they have.

So I am hoping at the very least we can control some aspects like top speed.
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Old 12-13-2010, 10:18 PM
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i wouldn't worry about it two much, the class is a lot of fun and until everyones on board just have fun with it.
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