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A sprag clutch is used in many helicopter designs to transfer power from the engine to the main rotor. In the event of an engine failure, the sprag clutch allows the main rotor to continue rotating faster than the engine so that the helicopter can enter autorotation. [2]
A one-way sprag clutch is built into the center of the upper sheave to allow the rotor system to continue to rotate in the event of engine failure, allowing the R22 to enter autorotation and land in a controlled manner. Because the main rotor has very little mass and inertia, autorotation in an R22 requires careful and proper execution to ...
A clutch is also required in the case of engine failure: in that situation, the rotors must disengage from the engine so that the rotors can continue spinning and perform autorotation. Helicopter clutches are usually freewheel clutches relying on centrifugal forces (sprag clutchs are commonly used), but belt drive clutches are also used.
To speed the development of the new anti-submarine helicopter Kamov designed and built a prototype to prove the cabin and dynamic components layout; designated Ka-20, this demonstrator was not equipped with mission equipment, corrosion protection or shipboard operational equipment. The Ka-20 was displayed at the 1961 Tushino Aviation Day display.
The V-22 Osprey is a troop transport with a helicopter's versatility and a turboprop's speed. But the V-22 has crashed several times since becoming operational in 2007, killing over 50 people.
In the subsequent investigation, the NTSB found that the sprag clutch that was installed in the helicopter, which was on lease to WNBC Radio by Spectrum Helicopters of Ridgefield Park, New Jersey, was a military surplus part which was not designed for use in a civilian aircraft, and that the part had not been adequately lubricated.
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Jewish Americans and Israeli Americans experience "serious discrimination" when applying for jobs, a shocking study released by the Anti-Defamation League Wednesday claims.
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