Airport Engineering
Castor angle is defined as the angle

Between the direction of wind and the longitudinal axis of the runway
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 horizontal and the fuselage axis

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Airport Engineering
Speed of

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

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