What’s better than a blackboard lesson on the principles of flight, lift and aerodynamics with folded paper airplanes? How about planes that are powered and can fly for as long as 30 seconds. That’s what PowerUp’s $35 Electric Paper Airplane Conversion Kit has in mind with a clip-on motor and propeller that requires 20 seconds to charge between flights. The kit costs $35 each or a four-pack for $60.
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