Looks like a bog standard 850 sized motor to me. the 850 isnt twice the size of a mini EV though, it has virtually an identicle casing. They run ok at 12v, but Ive also tried at 18v - it smelt pretty bad then.
Go for an HTI or similar (24v drill motor perhaps?) if you have the space to gear about 4 or 5 to 1 (will get better torque/speed to weight ratio then), otherwise a lower revving motor like a gold/fan motor as James suggested would be good.




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