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Unequal rotor lift distribution [citation needed] is an effect where the blades of a helicopter rotor generate more lift at the rotor tips than at the rotor hub. [1]: 1:11 Overhead view of helicopter rotors. The rotor tips travel much faster than the inner sections, so produce more lift.
The higher the loading, the more power needed to maintain rotor speed. [3] 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.
Rotor solidity is a function of the aspect ratio and number of blades in the rotor and is widely used as a parameter for ensuring geometric similarity in rotorcraft experiments. It provides a measure of how close a lifting rotor system is to an ideal actuator disk in momentum theory .
Stage 3: a steep decrease of the lift coefficient (lift break, lift stall) occurs as the DSV passes into the wake. Rotor map of dynamic stall locations for all conditions. Stage 4: full separation of the flow on the upper surface of the airfoil can be observed, accompanied by the peak of nose-down pitch moment.
Dissymmetry of lift [1]: 2–20 [2] (also known as asymmetry of lift [3]: 342 [4] or asymmetric lift [5] [6]) in rotorcraft aerodynamics refers to an unequal amount of lift on opposite sides of the rotor disc. It is a phenomenon that affects single-rotor helicopters and autogyros in forward flight.
The angle of attack can be increased to compensate, however beyond a certain point the rotor blades stall and lift rapidly decreases. Rotor stalls are not recoverable because the descending helicopter has airflow moving upwards through the rotor disc, so even full down collective will not restore normal airflow. When the helicopter rotor stalls ...
CFM, which this month celebrates its 50th anniversary, is testing a collection of technologies that could result in an open rotor engine whose main fan would be larger and more visible in order to ...
It was a tip-jet driven gyrodyne, which turned off rotor thrust at high airspeeds and relied on a pusher propeller to maintain forward flight and rotor autorotation. Lift was shared between the rotor and stub wings. It established a rotorcraft speed record of 170 knots (200 mph; 310 km/h). 0.95. [65] 180-410 [66] (50% [67]). 85% \ 15%.
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