Airport Engineering
Wing loading of an aircraft is

Load of the wings
Gross total weight of the aircraft/ wing area
Gross total weight of the aircraft/total available H.P of engines
Gross total weight of the aircraft/ load of the wings

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Airport Engineering
Castor angle is defined as the angle

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

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