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Glossary & Acronyms
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Term Definition
tail incidence angle The angle between the horizontal tail chord line and the aircraft reference line.
taper ratio The ratio of a wing’s tip chord to its root chord
tapered 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
temperature A measure of the average kinetic energy of gas molecules as they move and collide with each other.
test section 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
thickness-to-chord ratio 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
     angle The angle between the thrust vector and the velocity vector.
     dry Turbojet and turbofan engine thrust without afterburner
     required The amount of thrust required to overcome drag and sustain steady, level, unaccelerated flight
     sea level Thrust in standard day sea level conditions
     static Thrust when the aircraft has zero forward velocity
     to-weight ratio The ratio of maximum static sea level thrust to either aircraft or engine weight
     wet Turbojet and turbofan engine thrust with afterburner
thrust Propulsive force produced by an aircraft engine
tip loss loss of lift at the blade tip due to three dimensional induced effects
tip speed tangential velocity of the rotor blade in hover
tip vortex 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
torque moment about the rotor shaft in the top view due to the total drag of the rotor blades
torsion box 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
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