Hydrogen Peroxide Powered Helicopter
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Instead of a conventional fixed motor, the Dragonfly DF1 helicopter uses jets attached to the tips of its blades - powered by hydrogen peroxide (H2O2).

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The zero-pollution jets are fueled by 70 percent hydrogen peroxide (H2O2) and give the DF1 a top speed of 185 km/h (115 mph) and a ceiling of 4,000m (2.5 miles) at a climb rate of 700 m (2,300 ft) a minute. It is simpler and safer to fly than conventional helicopters as there are less flight controls and moving parts, offering improved stability since propelling the rotors directly produces less vibration. As there is no motor torque, the tail rotor is only required to rotate the helicopter and not for stability.
The H2O2 rocket motors use a penta-metal catalyst to instantly dissociate the peroxide into 600 degree Celsius high pressure steam and drive the blades. The DF1 retains the traditional collective/throttle lever but steers via a motorbike-like control bar for tilting the rotor head. It also needs no foot controls.
The tanks hold 70 liters (18.5 gal) of fuel to provide up to 50 minutes of flight time at a cruising speed of 65 km/h (40 mph). This can be extended to 100 minutes with an optional extra 60-liter (16 gal) fuel tank. The helicopter weighs a mere 106 kg (234 lbs) empty and can carry up to 227 kg (500 lbs) including pilot and fuel. Other options include a windshield canopy, crop spray system, rescue hammock, cargo compartment, fire extinguisher, autopilot, winch, more powerful engines and navigation and landing lights. Swisscopter has conducted test flights of the DF1 and obtained airworthiness certificates ahead of an expected commercial launch of the DF1 this year. More info at .

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