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Alot of these motors are high speed, low torque, so gearing it down somehow it needed without adding alot of weight.
I'm not finding a price list, but one forum I found said that one of the 11kw motors cost $830 just for the motor and weighed over 15 pounds, so amazingly light for a motor of that power, but it's also designed to turn a prop, so the bearings on it are not going to handle a side load very well.
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