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In the Maker Shed: Gakken Cross Copter EX

In the Maker Shed: Gakken Cross Copter EX
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The Gakken Cross Copter EX kit has two contra-rotating rotors, driven by one small electric motor that's connected via a cord to the hand-powered generator. Available in the Maker Shed  ...  (Oh, and the original video uploaded was 45 seconds!)

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