The angle between the horizontal tail chord line and the aircraft reference line.
The ratio of a wing’s tip chord to its root chord
refers to a wing whose tip chord is less than its root chord. Taper, along with twist, can be used to alter the spanwiselift distribution on a wing
A measure of the average kinetic energy of gas molecules as they move and collide with each other.
The portion of a wind tunnel with the smallest cross-sectional area and highest velocities where measurements of aerodynamic forces and pressures on models are made
The ratio of an airfoil’s maximum thickness to its chord
three dimensional lift
refers to the lift produced by a wing rather than an airfoil; the latter is frequently tested extending from wall to wall in a wind tunnel
The angle between the thrust vector and the velocity vector.
Turbojet and turbofan engine thrust without afterburner
The amount of thrust required to overcome drag and sustain steady, level, unaccelerated flight
Thrust in standard day sea level conditions
Thrust when the aircraft has zero forward velocity
The ratio of maximum static sea level thrust to either aircraft or engine weight
Turbojet and turbofan engine thrust with afterburner
Propulsive force produced by an aircraft engine
loss of lift at the blade tip due to three dimensional induced effects
tangential velocity of the rotor blade in hover
local whirling motion of air particles exciting in the chordwise direction from the tip of the rotor blade, wherein the whirling is about an axis normal to the blade in a rotational sense from thr bottom to the top surfaces
moment about the rotor shaft in the top view due to the total drag of the rotor blades
these can have one,two, or three cells. One cell may be formed by the wing's leading edge and the forward spar. A second cell may be formed by the two main spars and the upper and lower skinstretching between the spars