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Electric vehicles Answered

My electric racing car used a 250 watt Dc motor that weighed about 4 KG.

This motor https://hobbyking.com/en_us/power-systems/electric...

claims to be 4000 watts - OK that will be at 2600 rpm but a gear box isn't that much of a problem.

Yet I see no DIY electric vehicles using such a motor other than a few electric bikes.

Am I missing something. Watts are watts as far as I know. 4000= about 5.5 Hp. more than enough for a small light electric car.

expert input please.