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Aviation
Dealing with vehicles or machines used in flight or propulsion through the air.
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Aviation > Airplane flying 
minimum drag speed (VMD)
Aviation; Airplane flying
The minimum drag speed occurs at the speed where the induced drag is equal to the parasitic drag. This is the speed at which the best gradient of climb, or for unpowered aircraft, ...
maximum operating speed (VMO)
Aviation; Airplane flying
VMO is the maximum normal operating speed in which the pilot has full control authority of the aircraft. Maximum operating speed is expressed in knots.
never-exceed speed (VNE)
Aviation; Airplane flying
Operating above this speed is prohibited since it may result in damage or structural failure. The red line on the airspeed indicator.
maximum structural cruising speed (VNO)
Aviation; Airplane flying
The upper limit of the green arc. Do not exceed this speed except in smooth air.
best angle of climb (VX)
Aviation; Airplane flying
The speed at which the aircraft will produce the most gain in altitude in a given distance.
best glide
Aviation; Airplane flying
The airspeed in which the aircraft glides the furthest for the least altitude lost when in non-powered flight.
best rate of climb (VY)
Aviation; Airplane flying
The speed at which the aircraft will produce the most gain in altitude in the least amount of time.
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