"Andreas Maurer" wrote in message
news
On Sun, 04 Apr 2004 00:06:23 GMT, "Bill Daniels"
wrote:

No glider will stabilize itself at
the trimmed airspeed because the phugoid is undamped. It will oscillate
around the trimmed airspeed with ever increasing amplitude.

I think things are getting esoteric now.
I've flown about 40 kinds of gliders so far, an ALL of the stabilized
at the trimmed airspeed within a couple of oscillations. None was
showing the behaviour that you describe.
What am I doing wrong?

Flying very low preformance gliders or flying with the spoilers open?


Hmmm... is it possible that you are flying with an extremely aft CG?

If the CG were aft, then it wouldn't have a restoring force and so wouldn't
oscillate. It's when the CG is toward the forward limit that the
oscillation is worse.

Bill Daniels