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For a helicopter on the ground, as the blades rotate, they describe a horizontal disc due to centrifugal force. However, as the helicopter generates lift, the blades are pulled upwards into a cone shape. [1] [2] [3] Coning results from the balancing of centrifugal and aerodynamic forces. [4] The coning angle depends on RPM, gross weight and g ...
The American Helicopter Society (AHS) International's Igor I. Sikorsky Human Powered Helicopter Competition was a competition to achieve the first human-powered helicopter flight to reach an altitude of 3 m (10 ft) during a flight lasting at least 60 seconds, while remaining within a 10 m (32.8 ft) x 10 m (32.8 ft) square, and complying with other competition requirements. [1]
By October 2018, the in-service and stored helicopter fleet of 38,570 with civil or government operators was led Robinson Helicopter with 24.7% followed by Airbus Helicopters with 24.4%, then Bell with 20.5 and Leonardo with 8.4%, Russian Helicopters with 7.7%, Sikorsky Aircraft with 7.2%, MD Helicopters with 3.4% and other with 2.2%.
The Sikorsky/Lockheed Martin VH-92 Patriot [4] is an American helicopter operated in the United States Marine Corps' Marine One U.S. presidential transport fleet. It is a militarized variant of the Sikorsky S-92 and is larger than the former Marine One helicopters. [5]
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Startling video shows a helicopter spinning out of control and crashing into a small plane at a Texas airport — with the pilot miraculously walking away unscathed.
When the helicopter rotor stalls, it does not do so symmetrically, because forward airspeed causes higher airspeed on the advancing blade than on the retreating blade. The retreating blade stalls first and its weight makes it descend as it moves aft, while the advancing blade raises as it goes forward.
Aircraft flight mechanics are relevant to fixed wing (gliders, aeroplanes) and rotary wing (helicopters) aircraft.An aeroplane (airplane in US usage), is defined in ICAO Document 9110 as, "a power-driven heavier than air aircraft, deriving its lift chiefly from aerodynamic reactions on surface which remain fixed under given conditions of flight".