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
Between the horizontal and the fuselage axis
Formed by the longitudinal axis of the aircraft and the direction of movement of the nose gear

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Airport Engineering
The capacity of parallel runway pattern depends upon

Weather conditions and navigational aids available
Lateral spacing between two runways and weather conditions
Lateral spacing between two runways, weather conditions and navigational aids available.
Lateral spacing between two runways and navigational aids available

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