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Terminal Velocity: The maximum speed attainable by an aeroplane at its most acute diving angle, the engine and propeller operating under specified conditions.
The terminal velocity of a 4 mm raindrop is about 9 metres/sec. Only clouds with extensive depth, 3000 feet plus, will produce rain (rather than drizzle) but very small high clouds, generating heads, ...
terminal velocity, 6.1
terrain: See obstacle clearance, 21.4
thermal gradient wind, 20.2.1
thermal gradient wind: definition, 20.2.1
throttle, 1, 1.2.3, 1.3.1, 1.5, 2.3, 7.1
throttle usage: back side of power curve, 7.2.2
thrust, 8.10 ...
Falling Objects An object falling through the atmosphere is subjected to two forces, weight and drag, and attains a constant terminal velocity. If the object were falling in a vacuum, only gravity would act on the object.
PERSONNEL PARACHUTE (PP). A retardation device worn on the back of a paratrooper to reduce the rate of descent from terminal velocity to 18 to 22 feet per second after exiting an aircraft while in flight.
As the airspeed decreases to near the stalling speed, the total drag becomes greater, due mainly to the sharp rise in induced drag. As the airspeed reaches the terminal velocity of the aircraft, the total drag again increases rapidly, ...
On the negative side was a certain structural weakness in high G pullouts and a reluctance to recover from terminal velocity dives, in which they couldn't really get going all that fast anyway. They could not easily pursue a diving P-40, for example.
 See also: Speed, Velocity, Weight, Power, Plane
  
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