Posted: 3/17/2010 23:37:59
Reminds me of a steam engine!
The Dragonfly DF1 is an ultralight helicopter that uses
rotor tip rockets instead of a
conventional engine. The rockets produce no
pollution and are fueled by 70 percent hydrogen peroxide (H202) . Top speed is reportedly 115 mph and climb rate is 2,300 ft per minute.
there is no rotor torque beyond bearing drag, the tail rotor is only tasked with yaw control, not stability.
Empty weight is 234 lbs with design payload of up to 500 lbs including pilot and fuel.
Posted: 3/18/2010 04:13:40
Very impressive. Would make a fun UAV except for cutting it back from 18.5 gal to 5 gal would reduce flight limits from 50 to 13.5 minutes, enough time to play if you don't go anywhere.
Posted: 3/18/2010 08:14:28
Online Community Manager - EAA
Posted: 3/18/2010 13:36:29
I have just emailed their invitation to AirVenture!
Posted: 3/20/2010 04:46:03
Extremely cool! They could probably eliminate some weight and powerloss to the rotor by eliminating the tail rotor. Yaw control can be provided by either a loose brake on the bearing (only works in one direction and dangerous if not done right) or by a vertical "flap" that uses the rotor downwash to generate the yawing moment.