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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.
Flapback [1]: 3:28 or blowback [2]: 2–14, 2–20, 2–21 [3] is the tilting of a helicopter rotor disc, usually aft (backwards), which occurs in several circumstances. In normal operating circumstances, forward flight results in flapback caused by dissymmetry of lift and the transverse flow effect.
Dissymmetry of lift is an aerodynamic phenomenon caused by the rotation of a helicopter's rotors in forward flight. Rotor blades provide lift proportional to the amount of air flowing over them. When viewed from above, the rotor blades move in the direction of flight for half of the rotation (advancing half), and then move in the opposite ...
Even when hovering, the rotor tips may be travelling at a significant fraction of the speed of sound. As the helicopter accelerates, its overall speed is added to that of the tips, meaning that the blades on the forward-moving side of the rotor sees significantly higher airspeed than the rearward-moving side, causing a dissymmetry of lift.
The top Democrat on the Senate Commerce Committee said Thursday the United States needs to reconsider the significant military helicopter flights near one of the most congested U.S. airports after ...
P-factor is extremely significant for helicopters in forward flight, because the propeller disc is almost horizontal. The forward-going blade has a higher airspeed than the backward-going blade, so it produces more lift, known as dissymmetry of lift. Helicopters can control each blade's angle of attack independently (decreasing the angle of ...
Rescuers on a boat work next to the wreckage of a Black Hawk helicopter at the site of the crash after it collided with the American Eagle flight 5342 outside Washington, D.C, Jan. 30, 2025.
According to audio from LiveATC.net, while approaching runway 19, air traffic control warned the jet about a nearby helicopter. Republic Airways Flight 4514's landing delayed by less than 10 minutes