nstead of using a fixed motor attached to the body of the helicopter to drive the blades, the rocket powered helicopter using small rocket motors install at the tips of the blades to power it. There is no engine installed on the Dragonfly DF1, the hydrogen peroxide rockets produce no pollution and with less vibration and improved stability. The Dragonfly can stay aloft for 50 minutes and has a maximum speed of 40 mph. Watch the video!