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Prototype heavy-lift helicopter, largest rotor at 39.6 m Mil Mi-6: 5 June 1957: 44 t: 926 Heavy transport helicopter, 35 m rotor Mil V-12 or Mi-12 10 July 1968: 105 t: 2 Largest prototype helicopter, 2 × 35 m rotors Mil Mi-26: 14 December 1977: 56 t: 316 Heaviest serial production helicopter Fairey Rotodyne: 6 November 1957: 15 t 1 Largest ...
A low disk loading is a direct indicator of high lift thrust efficiency. [4] Increasing the weight of a helicopter increases disk loading. For a given weight, a helicopter with shorter rotors will have higher disk loading, and will require more engine power to hover. A low disk loading improves autorotation performance in rotorcraft.
Some rotary wing aircraft are designed to stop the rotor for forward flight so that it then acts as a fixed wing. For vertical flight and hovering it spins to act as a rotary wing or rotor, and for forward flight at speed it stops to act as a fixed wing providing some or all of the lift required. Additional fixed wings may also be provided to ...
Retreating blade stall is a hazardous flight condition in helicopters and other rotary wing aircraft, where the retreating rotor blade has a lower relative blade speed, combined with an increased angle of attack, causing a stall and loss of lift.
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Its rotary wings can provide lift even when hovering or manoeuvring vertically, like a helicopter. No production designs have been built, but several crewed and uncrewed prototypes have flown. The term "hybrid airship" has also been used to describe an airship comprising a mix of rigid , semi-rigid , and non-rigid construction.
On a helicopter, the main rotor or rotor system is the combination of several rotary wings (rotor blades) with a control system, that generates the aerodynamic lift force that supports the weight of the helicopter, and the thrust that counteracts aerodynamic drag in forward flight.
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