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The comment of the pilot was... "This is the most stable and smoothest vibration free helicopter I have flown"
The Dragonfly DF1 is a, wait for it... Rocket powered one-man helicopter! Although admittedly it doesn't look as good as it sounds.
Designed and built by Swisscopter, the Dragonfly DF1 uses a pair of hydrogen peroxide fueled rockets attached to the tips of the rotors for power - instead of a more conventional gas turbine engine found in most contemporary helicopters. This isn't a new idea, the British and American armed forces experimented with similar rocket-powered helicopter technology back in the 1950s but it never took off. Please forgive the pun.
The Dragonfly DF1 is a very basic machine which is incredibly light. It tips the scales at a featherweight 106 kgs (234 lbs). Yet it can carry an amazing 227 kgs (500 lbs) of pilot, fuel and cargo. Top speed of the aircraft is 115 mph (185 km/h), cruise speed is around 40 mph (65 km/h), and the flight time is up to 50 minutes - although an optional extra fuel tank takes this up to 100 minutes.
Control of the Dragonfly DF1 also differs from a more 'normal' helicopter. Instead of a joystick for banking left and right and controlling forward and backward movement, a collective control for engine power, and a set of rudder pedals for yaw control, the Dragonfly DF1 gets a much simpler handlebar mechanism which hangs down from the rotor head and allows the pilot to control the angle of the blades. A throttle lever allows for power adjustment.
While it might seem at first that this is some sort of cobbled together widow-maker, it is in fact a fully certified and sanctified machine which is approved by the FAA (Federal Aviation Administration).
Read more at www.liveleak.com...
originally posted by: Dabrazzo
a reply to: aussiefly
Hydrogen peroxide is deadly if mishandled.
originally posted by: CovertAgenda
a reply to: OrionsGem
I wonder why this has a tail rotor, as using a tipjet powered main rotor does not create an opposing torque as per a normal heli (not multi rotor etc)
I suppose for yaw control, but that is a complex and power wasting exercise. One advantage of tipjets is that it does away with theneed for heavy rotor controls and driveshafts/gearboxes etc.
The Fairey Rotodyne used the engine jet efflux, and large control surfaces for this purpose
Are you sure that a tail rotor is not needed???
What about yaw control which is essential to the helicopters operation??
Rotorcraft using tip jets Percival P.74 - used engines in fuselage to produce efflux at wingtips. Engines never produced sufficient power and so it never flew. Further progress with the design using more powerful engines was cancelled. Hiller YH-32 Hornet - first flying 1950, 'jet jeep' had good lifting capability but was otherwise poor Mil V-7 - Soviet turbojet helicopter Fairey Jet Gyrodyne - provided data for the Rotodyne. First flew in 1954. Fairey Rotodyne - 48 seater short-haul airliner design. First flew in 1957. Cancelled due to doubts about noise of tipjets in service. Fairey Ultra-light Helicopter - First flew in 1955. Four built for military use but defence cuts left Fairey to continue development without support and there were no further orders. Fiat 7002 - first flew in 1961, only one built Focke-Wulf Fw Triebflügel German World War II interceptor design — not built McDonnell XV-1 - flew in 1954, compound gyroplane, cancelled due to insufficient advantage over contemporary helicopters Hughes XH-17 - flying crane (largest rotor of any type on a helicopter), cancelled due to inefficient design (range around 40 miles) NHI H-3 Kolibrie (Nederlandse Helikopter Industrie ) (ca 11 built) Innosuisse SwissCopter (DragonFly) Rotary Rocket Roton ATV Sud-Ouest Djinn - First flew in 1953. Use compressed air tip jets JK-1 Trzmiel (Polish prototype one-seat helicopter) VFW-Fokker H3 - two flew None apart from the Sud-Ouest Djinn have made it into production.
Use as a monopropellant takes advantage of the decomposition of 70–98+% concentration hydrogen peroxide into steam and oxygen. The propellant is pumped into a reaction chamber where a catalyst, usually a silver or platinum screen, triggers decomposition, producing steam at over 600 °C (1,112 °F), which is expelled through a nozzle, generating thrust.