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A coaxial-rotor aircraft is an aircraft whose rotors are mounted one above the other on concentric shafts, with the same axis of rotation, but turning in opposite directions (contra-rotating). This rotor configuration is a feature of helicopters produced by the Russian Kamov helicopter design bureau .
Tandem-rotor helicopters, however, use counter-rotating rotors, with each cancelling out the other's torque. Therefore, all of the power from the engines can be used for lift, whereas a single-rotor helicopter uses some of the engine power to counter the torque. [1] An alternative is to mount two rotors in a coaxial configuration.
Stanley Hiller, then seventeen, established the first helicopter factory on the West Coast of the United States, located in Berkeley, California, [1] in 1942, under the name "Hiller Industries," to develop his design for the coaxial-rotor XH-44 "Hiller-Copter" for the U.S. Army.
Contra-rotating propellers Contra-rotating propellers on the Rolls-Royce Griffon-powered P-51XR Mustang Precious Metal at the 2014 Reno Air Races. Aircraft equipped with contra-rotating propellers (CRP) [1] coaxial contra-rotating propellers, or high-speed propellers, apply the maximum power of usually a single piston engine or turboprop engine to drive a pair of coaxial propellers in contra ...
Helicopter rotors are designed to operate at a specific rotational speed. The throttle controls the power of the engine, which is connected to the rotor by a transmission. The throttle setting must maintain enough engine power to keep the rotor speed within the limits where the rotor produces enough lift for flight.
Powerplant: 1 × McCulloch Model 4318AX 4-cylinder air-cooled 2-stroke horizontally-opposed piston engine, 72 hp (54 kW) Main rotor diameter: 20 ft 0 in (6.10 m) Main rotor area: 314.2 sq ft (29.19 m 2) Blade section: Bensen G2; Propellers: 2-bladed Aero Prop Model BA 48-A2fixed-pitch pusher propeller, 4 ft 0 in (1.22 m) diameter; Performance
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A new engine, the Future Affordable Turbine Engine (FATE), is to meet the radius requirement of 229 nmi (264 mi; 424 km). [ 27 ] [ 5 ] Compared to conventional helicopters, the counter-rotating coaxial main rotors and pusher propeller offer a 185-knot (213 mph; 343 km/h) speed increase, a 60% combat radius extension, and 50% better performance ...