Jaybird180
Final Approach
When a compass is calibrated, do RPMs matter? Does the error rate change at various settings?
Swinging a Compass
- Thread starter Jaybird180
- Start date
They shouldn't, but they may. You should have a set of flinders bars that pretty much takes care of that low of a field change. I suggest that you test it to make sure. If you are sitting there and nothing changes except the vibration, you're good.
Graueradler
Pattern Altitude
Engine RPM should not affect the compass calibration but engine RPM could vary Generator or Alternator output current (generator more than alternator). In a Cherokee Flite Liner, with the compass mounted in the panel at the left side, alternator output current very definitely affected the compass. Easy to demonstrate by flipping the alternator field switch on and off.