"Matt Barrow" wrote in message
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"Stan Prevost" wrote in message
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"Matt Barrow" wrote in message
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Also, this thing is much less prone to errors:
http://www.aircraftspruce.com/catalo...rd_compass.php
and http://www.pai700.com/index.html


Less prone to what kind of errors?

Turning, acceleration, deceleration...



The ones I have flown with, and installed in my airplane, have those same
errors as the whiskey compass, because they work on the same principle, they
are just geared to indicate direction with a vertical card. They do seem to
be more stable in turbulence. Well, actually I haven't tested acceleration
and deceleration, but turning errors seem to be the same.

The main advantage I find in a vertical card compass is the more natural
presentation they give, it doesn't seem backward like the whiskey compass,
and matches the presenation on other directional instruments.