Definitions

liver rot

ROT

[rot]

The aviation term ROT stands for rate one turn, also known as a standard rate turn. All aircraft must be able to perform a standard rate turn.

A standard rate turn for (light) airplanes 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°/minute).
For heavy airplanes a standard rate turn is a 4-minute turn.

Instruments, either the turn and bank indicator or the turn coordinator, have the standard rate turn clearly marked. Light aircraft are equipped with 2-minute turn indicators while heavy aircraft are equipped with 4-minute turn indicators. This is very useful to pilots who are out of visual contact with the ground and for air traffic control when appropriate separation of aircraft is desired. The pilot banks the airplane such that the turn and slip indicator points to the standard rate turn mark and then uses a watch to time the turn. The pilot can pull out at any desired direction depending on the length of time in the turn.

A rate half turn (1.5° per second) is normally used when flying faster than 250 kt. The term rate two turn (6° per second) used on some high speed aircraft.

Angle of Bank formula

The formula for calculating the angle of bank for a specific True Airspeed (TAS) is:

tan(bank)=frac{TAS^2/r}{g}

where r is the radius of the turn and g is the acceleration due to gravity. For a rate one turn and velocity in kt (nautical miles per hour), this comes to

tan(bank)=frac{TAS(kt)}{364}.

A convenient approximation for the bank angle in degrees is

Angle of Bank approx frac{TAS(kt)}{10} + 7

Radius of Turn formula

One might also want to calculate the radius of a Rate 1,2 or 3 turn at a specific TAS.

Radius of turn in NM = frac{TAS(kt)}{rate of turn (1 or 2 or 3) times 60 times pi}

Use this formula to calculate the radius of turn in feet given velocity in knots and angle of bank:

Radius of turn in feet = frac{velocity^2}{11.29 times tan(bank)}

This is a simplified formula that ignores slip and returns zero for 90 degrees of bank.

The constant 11.29 is calculated:

11.29 = frac{9.8 times 3600 times 3600}{1852 times 6076.12}

9.8 = gravity in metres per second per second

3600 = seconds per hour

1852 = metres per nautical mile

6076.12 = feet per nautical mile

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