Some excerpts taken from the book:
Gyroscopic Instruments
CHAPTER 5
RATE OF TURN INDICATOR
The Rate of Turn indicator provides a stable DR navigational reference for banked turns. During a banked turn, an aircraft must lower one wing and then describe a curve on the side of that wing. Otherwise, the aircraft will not be stable during the turn.
In the Rate of Turn indicator (fig. 5.1) there are two displays, namely: the Slip and Skid display and the Banked Rate of Turn display. The Rate of Turn display corresponds to the angular speed of the aircraft while the lowered wing corresponds to the inclination of the bank. The Slip and Skid display, on the other hand, corresponds to the radius of
The expression for random wander, in the Rate of Turn Indicator, is represented in (2.6) by the term . Random wander is caused by friction and impurities found at the rotor and gimbal joints. Its effect on the gyro is to increase the drift.
Random wander is a complicated problem (as shown in sections 3.2.2 and 4.1.2). The latest models of the Rate of Turn Indicator (section 5.1), therefore, are concerned mainly with minimizing the random wander.
5.2.3 Acceleration Error.
The acceleration error of the Rate of Turn Indicator is due to the x- component of the Coriolis parameter. According to section 2.2.3, acceleration error is an apparent wander. However, according to the Rate of Turn Indicator equation (2.6), there is no drift term for the Coriolis parameter. Therefore, the Rate of Turn Indicator has no acceleration