Gyroscopes Flashcards
Gyroscope
A wheel which spins on an axis
Rigidity
Reluctance to change direction of it’s spin axis
Precession
A force applied to the wheel of a spinning gyro acts at a point 90 degrees removed in the direction on the spin
Types
Space
Tied
Earth
Rate
Space (Free) Gyro
Freedom in all 3 planes mounted in two rings
No use to instruments
Tied
Space gyro with a means of external control in one or more planes to keep the gyro set ip and maintained in a certain direction
Used in a DG
Earth Gyro
Tied gyro controlled by gravity
Used in an AI
Rate Gyro
Freedom of motion in two planes
Measures rates of turn
Used in a TC
Wander
Movement or deviation from a set position
Horizontal Plane Wander
Drift (max at poles)
Earth rate drift can be corrected by a latitude screw
Vertical Plane Wander
Topple (max at the equator)
Can be prevented by gimbal stops
Horizontal Axis at the Pole
Max drift, no topple
Horizontal axis (E/W) at the Equator
No drift, max topple
Horizontal Axis (N/S) at the Equator
No drift, no topple
Vertical axis at the Pole
No drift, no topple
