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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 makershed.com (Oh, and the original video uploaded was 45 seconds!).

Maker Shed

Maker Shed

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 .