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
makershed.com (Oh, and the original video uploaded was 45 seconds!).
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The Maker Shed is brought to you by Maker Media, the makers of MAKE Magazine, the Maker Faire, and much more.
Launched originally as a source for back issues of MAKE Magazine, the Maker Shed expanded rapidly to meet the demand for 'projects in a box,' otherwise known as kits. Now we have a little bit of everything for makers, crafters, and budding scientists, from Arduinos to sock monkeys to chemistry sets .
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