blade flapping

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• blade flapping — The vertical movement of a helicopter rotor blade about a horizontal or flapping hinge, in which the blades tend to rise and descend with respect to the rotor hub as they rotate. Blade flapping tends to minimize asymmetrical lift by increasing… …   Aviation dictionary

• flapping — The angular movement of a rotor blade above or below the plane of the hub. Blades ride higher and lower during their rotation, but they can do so only if they are allowed to move freely about a horizontal hinge or flexible root element. Design… …   Aviation dictionary

• flapping hinge — A hinge connecting a rotor blade to the hub and about which the blade rises and falls (i.e., flaps during its rotation, and thus permits equalization of lift or rotor thrust) between the advancing blade half and the retreating blade half of the… …   Aviation dictionary

• flapping to equality — During the movement of a helicopter rotating blade, the speed of airflow over the advancing blade is higher than the retreating blade, resulting in production of an unequal amount of lift. This is called a dissymmetry of lift. To correct this… …   Aviation dictionary

• retreating-blade stall — The stall of a helicopter rotor disc that occurs starting at the tip of the retreating blade. This happens when the helicopter forward speed is high. The individual angle of attack of the retreating blade becomes larger because the downward blade …   Aviation dictionary

• helicopter — /hel i kop teuhr, hee li /, n. 1. any of a class of heavier than air craft that are lifted and sustained in the air horizontally by rotating wings or blades turning on vertical axes through power supplied by an engine. v.i. 2. to fly in a… …   Universalium

• Juan de la Cierva — This name uses Spanish naming customs; the first or paternal family name is De la Cierva and the second or maternal family name is Codorníu. Juan de la Cierva …   Wikipedia

• Dissymmetry of lift — in rotorcraft aerodynamics refers to an uneven amount of lift on opposite sides of the rotor disc. It is a phenomenon that affects single rotor helicopters in lateral flight, whether the direction of flight be forwards, sideways or in reverse.… …   Wikipedia

• Fairey Rotodyne — infobox Aircraft name = Rotodyne caption = The Fairey Rotodyne prototype XE521 on a test flight type = Compound gyroplane manufacturer = Fairey Aviation designer = first flight = 6 November 1957 introduced = retired = status = Cancelled 1962… …   Wikipedia

• Louis Charles Breguet — For the Grande école formerly known as the Breguet School, see ESIEE Louis Charles Breguet (January 2, 1880 in Paris May 4, 1955 in Saint Germain en Laye, France) was a French aircraft designer and builder, one of the early aviation pioneers.In… …   Wikipedia

• Center of gravity of an aircraft — The center of gravity (CG) is the point at which an aircraft would balance if it were possible to suspend it at that point. It is the mass center of the aircraft, or the theoretical point at which the entire weight of the aircraft is assumed to… …   Wikipedia