lead angle


lead angle
i. The angle by which an allowance is made for the radius of turn to enable the aircraft to role out on the desired track. The aircraft must commence its turn to the track before reaching it; otherwise, the aircraft will overshoot the desired track. This lead angle depends on the true air speed (TAS), distance, wind velocity, and aircraft rate of turn. In a given time out, its value is constant irrespective of the TAS.
ii. The angular difference between the line of sight and an aiming line. Also called the angle of lead.

Aviation dictionary. 2014.

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