blade airfoil

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• Blade element theory — (BET) is a mathematical process originally designed by William Froude (1878), David W. Taylor (1893) and Stefan Drzewiecki to determine the behavior of propellers. It involves breaking an airfoil down into several small parts then determining the …   Wikipedia

• blade — i. A rotating airfoil driven by a helicopter engine to produce vertical lift. Also called a rotor blade. ii. A rotating airfoil driven by an aircraft engine to produce a thrust force approximately in line with the longitudinal axis of the… …   Aviation dictionary

• Airfoil — An airfoil (in American English) or aerofoil (in British English) is the shape of a wing or blade (of a propeller, rotor or turbine) or sail as seen in cross section. An airfoil shaped body moved through a fluid produces a force perpendicular to… …   Wikipedia

• airfoil — /air foyl /, n. Aeron. any surface, as a wing, aileron, or stabilizer, designed to aid in lifting or controlling an aircraft by making use of the air currents through which it moves. [1920 25; AIR1 + FOIL2] * * * Shaped surface, such as an… …   Universalium

• airfoil/aerofoil — A body of such shape that the force exerted on it by its motion through a fluid has a larger component normal, or perpendicular, to the direction of the motion than along the direction of the motion. This force is in the form of lift or thrust. A …   Aviation dictionary

• blade face — The flat surface of a propeller blade corresponding to the underside of an airfoil. This is the portion of the blade that strikes the air. The other side of the blade is called blade back …   Aviation dictionary

• blade chord — A straight line joining the leading edge of a propeller blade with its trailing edge. blade cuff A metallic, wooden, or plastic structure designed for attachment to the shank end of the blade, with an outer surface that will transform the round… …   Aviation dictionary

• blade back — noun : the surface of a propeller or rotor blade that corresponds to the upper surface of a lifting airfoil …   Useful english dictionary

• blade face — noun : the surface of a propeller or rotor blade that corresponds to the lower surface of a lifting airfoil called also driving face, thrust face …   Useful english dictionary

• airfoil — noun Date: circa 1922 a body (as an airplane wing or propeller blade) designed to provide a desired reaction force when in motion relative to the surrounding air …   New Collegiate Dictionary

• Retreating blade stall — is a hazardous flight condition in helicopters and other rotary wing aircraft, where the rotor blade rotating away from the direction of flight stalls. The stall is due to low relative airspeed and/or excessive angle of attack (or AOA).… …   Wikipedia