Nick Thomas
SLF keep the rest of us in business, your input is so very welcome here. Nick, the 'French Bike Bell' is exactly what it was, as the electric pitch trim wheen ran up or down a striker would impact this tiny bell and make the sound that you describe. 'Pitch Trim' sounds like a strange term, after all the aircraft had no trim tabs or tailplane as we all know. What varying the pitch trim used to do was to alter the neutral setting of the artificial feel unit, the control column following this neautral datum.
ZX81, takes me back here. The tape loading that was used on the INS took around 45 minutes per navigation unit, that's two and a quarter hours total for the system. (There was no cross-loading). If Concorde had remained in service, new legislation meant that a more accurate primary navigation system would have been required. One of the systems under consideration was a Litton 82 laser INS with GPS refinement. (As well as DME updating also).
Dude
