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You can already get a soup-can sized 3.5kw motor on Amazon for ~$100, so that exists already. Their tech might be optimized for the size motor, but if not, there might be room for improvement at the smaller size.

https://www.amazon.com/Flipsky-Hardened-Skateboard-Brushless...

(The idea that an e-skateboard can have four of those motors blows my mind. Suicide!)



The point is that's not enough for a car. You need around 20x that power as a minimum starting point for a small car.




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