Peter and Jose,


Regarding the "ball" to indicate turn coordination, I didn't have a
chance to ask about that.

Thanks for the first bit about the rate of turn.

The ball is probably one of the most simple
and reliable indicators in an airplane cockpit. To replace it with a slew of
electronics makes no sense at all. There's gotta be a real ball in there
somewhere.

Well, you'd think so, but apparently not.

Let's see if anyone else knows.
--
John H. Kay