In article , Jay Moreland
wrote:

I need to find out if there is an official maximum amount of precession
for a Directional Gyro. My aircraft precesses 10 degrees in 10 minutes
during mostly straight and level flight with only a few shallow banks.

One avionics tech told me that it depends on the gyro manufacturer as to
what is acceptable. He also told me that an out of the box unit tested
on the table should not precess more than ONE degree in four minutes.

Jay Moreland


I've heard 3 degrees/ 15 minutes as the max. One degree per minute is certainly
too much.

An airplane I used to fly had a lousy old DG in it...it precessed at a rate that
if you maintained the heading on the DG you were in about a 1/2 standard rate
turn. G

--
Dale L. Falk

There is nothing - absolutely nothing - half so much worth doing
as simply messing around with airplanes.

http://home.gci.net/~sncdfalk/flying.html