21 volts is just stupid, higher voltage doesnt always mean more power, just like a 9.6v ratshack car compared to a 7.2 v 1/10 car. Go for ph2t's turbo or nuerokinetic's, if ya dont have one, and i'm guessing you would.
Even though i said it was stupid, i bet you are the first to give it a go, good luck, but i'll say you could halve that voltage and use a lower turn motor to get similar power and much less weight.
What batteries are you using to get 21v?? Please dont tell me you are using 7 3 volt lithium watch battery type cells.
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