- The angle formed between the direction of air movement as it approaches an airfoil and as it leaves it.
Aviation dictionary. 2014.
Look at other dictionaries:
downwash — i. Fluid flow moving at a deflected angle after deflection by helicopter rotors and measured parallel to the disc. ii. Fluid flow deflected at an angle more perpendicular to the motion of the airfoil, measured in the plane parallel to the plane… … Aviation dictionary
effective angle of attack — That part of a given angle of attack that lies between the chord of an airfoil and a line representing the resultant velocity of the disturbed flow. This angle is measured on a finite wing, but it has the same effective magnitude as that of an… … Aviation dictionary
Longitudinal static stability — is important in determining whether an aircraft will be able to fly as intended. Static stability As any vehicle moves it will be subjected to minor changes in the forces that act on it, and in its speed. * If such a change causes further changes … Wikipedia
longitudinal stability — The stability of an airplane about the lateral (pitching) axis. An airplane is stable if, when its angle of attack is temporarily increased, forces act in such a way as to push the nose down and thus decrease the angle of attack. The main factors … Aviation dictionary
transverse flow effect — The unequal drag in the fore and aft parts of the rotor disc, which results in vibrations in most helicopters at speeds between 10 and 20 knots. In forward flight, air passing through the rear portion of the rotor disc has a greater downwash… … Aviation dictionary
Flight dynamics — is the science of air and space vehicle orientation and control in three dimensions. The three critical flight dynamics parameters are the angles of rotation in three dimensions about the vehicle s center of mass, known as pitch , roll and yaw… … Wikipedia
Lift (force) — For other uses, see Lift. Boeing 747 8F landing A fluid flowing past the surface of a body exerts a surface force on it. Lift is the component of this force that is perpendicular to the … Wikipedia
Helicopter rotor — This article is about helicopter main rotor systems. For antitorque control, see tail rotor. Helicopter rotor The rotor head of a Sikorsky S 92 A helicopter main rotor or rotor system is a type of fan that is used to generate both the aerodynamic … Wikipedia
Helicopter — For other uses, see Helicopter (disambiguation). Helicopter An LAPD Bell 206 … Wikipedia
USAF Digital DATCOM — The United States Air Force Stability and Control Digital DATCOM is a computer program that implements the methods contained in the USAF Stability and Control DATCOM to calculate the static stability, control and dynamic derivative… … Wikipedia