On May 20, 10:27 am, "Ken S. Tucker" wrote:

When thought through, the Mag-Comp is quite the
precision instrument. That fluid needs be able to
not freeze down to what, maybe -40F. (Ron from
Alaska might know). It also sits in an Arizona sun
and can't expand to burst, though yours (John)
may have.
It also has a viscosity that keeps the thing from
gyrating all over the place, the one we used had
a slow lag while banking, so if you wanted to come
to 180 level the wings for 178 and the thing creeps
to 180.
Ken

Good grief. The compass has a diaphragm to take care of
expansion and contraction, and its fluid is just a solvent that has a
low freeze point. Even plain old gasoline has a low freeze point.
Nothing "precision" about that. And as for lag while banking, you
haven't studied the Private Pilot groundschool stuff about Northerly
Turning Error or anything else. You CANNOT use it to roll out on a
heading like you claim.
And you can't fly a 150 at 37 Kts indicated on approach. 150s
never had knotmeters. anyway. Had airspeed indicators calibrated in
MPH.
And what is an "indescent indicator?" Does it measure indecent
exposure, maybe?

Dan