Airport Engineering
Speed of

Sound at 0°C is 1190 kmph
Sound at 0°C is called one Mach
All listed here
Sound varies 2.4 kmph per degree centigrade rise in temperature

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Airport Engineering
Castor angle is defined as the angle

Between the true speed of the aircraft and the crosswind component
Formed by the longitudinal axis of the aircraft and the direction of movement of the nose gear
Between the direction of wind and the longitudinal axis of the runway
Between the horizontal and the fuselage axis

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