Kollsman Altimeter has been a major challenge. I used a broken spare unit to test a stepper motor on it. The axis for the QNH setting needs to be lengthened to turn a potentiometer. The white flag on the altimeter scale for the KIFIS system can be biased out of view with a fixed voltage. […]
Category Archives: Instruments
Gauges conversions, photos, how I do it and system descriptions
28
Nov
Nov
OILY QTY gauges of N88ZL now to be used in the panels of D-ABUD. Now running a 5V stepper motor and the original 5V integral lightning. Look how few components are now involved! Once done correctly I doubt you will ever have to reopen the gauge except for the bulb change. This is a non […]
28
Nov
Nov
Finished the EGT indicators. These were U/S units from ebay (one is from N88ZL) and have been converted to Switec stepper motors for cost/accuracy/maintenance/reliability reasons. I decided against switching the original lightning to LED to keep the original look at night. Bulbs are cheap and easy to replace and have between 5000-40000 hours lifetime, more […]
02
Nov
Nov
N1 and N2 indicator are basically exactly the same in terms of construction. The major problem here is the vernier dial and the speed at which it is rotating during engine acceleration. Here is an engine spool up table. It shows that the engine can spool up above 50% at 10% within ~0,2 seconds. After […]
10
Aug
Aug
After a long search I was able to locate 3 original Lufthansa Bendix Radio Magnetic Indicators used on Boeing 707s! Still missing one but will definitely find that one too.