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Climb: Dashpot pushed down, increases volume of dashpot cylinder, decreases pressure in capsule = capsule contracts = climb indicated.
SensitivityHorizontallityAperiodicity
SAT = RAT (in Kelvin) / (1 + (0.2Kr *M^2) )Convert Celsius to Kelvin on entry and exit to the formula
1 aneroid capsule
2+ aneroid capsules, jewelled bearings and VIBRATOR
EI Bar - capsule chg moves I, inducing current. Servo starts to move E back into position but also moves ind.Adv = ⬆️accuracy, ⬇️friction, digital
Hot to Cold, don’t be bold - Altimeter will Over-readHigh to Low, look out below - Altimeter will Over-read
High to Low, Look out below - Altimeter will overhead
Earth rotates EASTWARDS at @ 600kts That is precisely 360/23.934 = 15.04 deg per hr (at the poles) ER Varies with the SINE of the LATITUDE for a Directional Gyro
NB: A gyro with only a vertical axis can TOPPLE whereas a gyro with horizontal axis can TOPPLE and DRIFT
Vertical Gyros appear NOT TO DRIFT or TOPPLEHorizontal gyros appear to Drift
Vertical Gyros appear to ToppleAn ‘East Aligned’ Horizontal Gyro appears to topple backwards to the verticalA ‘North Aligned’ Horizontal Gyro will not Topple or Drift if it remains at the Equator
DG must be re-synched with Compass every 10minsOr after heavy manoeuvres
Random Wander (mechanical imperfections) ER TW (caging - done by pilot)
ER = -15.04 x sine aircraft latitude (Northern hemisphere) (positive for southern)LN = opposite sign to ER i.e. in NH +ve
LN DONE BY ENGINEER at you location, uses the principle of precession The LN adjustment is used to OPPOSE the ER effect and therefore have an opposite sign mathematically