Dragonfly Helicopter: Low-Tech/High-Concept
To start up the hydrogen-peroxide-powered single-seat Dragonfly helicopter, the pilot pushes a few times on a fuel-pump crank handle, the fuel climbs up to the rotor hub and travels out to a tiny combustion chamber in the rotor tips, then it’s vaporized and ejected, creating thrust. “The only emission is water vapor,” says Ricardo Cavalcanti, […]