Airport Engineering
Castor angle is defined as the angle

Between the horizontal and the fuselage axis
Formed by the longitudinal axis of the aircraft and the direction of movement of the nose gear
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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Airport Engineering
Wing loading of an aircraft is

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

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