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This Hand Dynamo Cross Rotor Helicopter has two contra-rotating rotors, driven by one small electric motor that's connected via a cord to the hand-powered generator. Build one of three configurations or try one of your own!
Easy to build -- instructions are in Japanese but feature highly detailed assembly pictures (sorry, no English translation at this time). MAKE is proud to be the exclusive distributor in North America for these brilliant kits from Gakken.
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Required some tuning but that's the fun 
