Originally Posted by
seven g
Can anyone remember the direction and magnitude of the acceleration errors with the Mk 3 AH in early jets (T.11?). I seem to remember they were largely corrected in the Mk 4 AH fitted to the JP, although acceleration in that aircraft wasn't much to talk about.
My Ground School notes from 1961/2 at RAFC cover the Mk3 AH even though our course was the first to train on the JP. I quote from the relative paras :-
Acceleration Errors These, caused by inertia in pitch erection mercury switch and pendulosity of gyro unit, are not compensated for but should not exceed a false nose up indication of more than 2.5 degrees caused by the pitch erection switch. The pendulosity causes a slight roll error to port not exceeding 2 degrees..
The Mk 3B acceleration errors were less than the Mk3 due to increased gyro pendulosity. The Mk 3C was the same as the 3B but incorporated an ON/OFF flag.
None of them had an Upper Sling Swivel, but the .303 SMLE padlocked to my bed did!