Rate of Turn
In turning flight, the number of degrees of heading change per unit of time (usually measured in seconds) is referred to as the Rate of Turn. Is referenced Standard Rate Turn, also known as a Rate One Turn (ROT).
A Standard Rate Turn is defined as a 3° per second turn, which completes a 360° turn in 2 minutes. This is known as a 2-minute turn, or Rate One (180°/min):
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Rate 1 turn, is 180° per minute (3° per second).
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Rate 2 turn, is 360° per minute (6° per second).
The bank angle required to conduct a turn at a specific rate is directly proportional to True Airspeed (TAS). The approximate bank angle required to accomplish a coordinated rate one turn (3°/second) can be calculated by dividing the TAS (in knots) by 10 and then adding 7. Using this formula, an aircraft flying at 80 knots would require 15° of bank for a rate one turn whereas at 160 knots, 23° would be required and at 240 knots a bank angle of 31° would be required to achieve the same rate of turn:
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Angle of Bank= TAS / 10 +7
As the angle of bank is increased, the horizontal component of lift increases, thereby increasing the Rate of Turn (ROT).
At any given airspeed, the ROT can be controlled by adjusting the angle of bank.
The bank angle of a 2-minute circle depends on the TAS.
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Austro Control