On Fri, 23 Apr 2004 20:14:02 GMT, "Bill Daniels"
wrote:


A perfectly symmetrical glider with a perfectly smooth polar and
frictionless controls SHOULD develop a spiral dive from a hands off turn.

How does this explain the behaviour of non-radio-controlled model
gloiders that return to level flight anytime? They are built perfectly
symmetrical, have a smooth polar and no controls at all...


Bye
Andreas