"Marc J. Zeitlin" wrote in message ...
Blueskies wrote:

A canard design is just the opposite. The CG is behind the CP, and
when the canard stalls, the nose drops because their is no longer
any lift to hold it up. This is why canards must always stall the
front wing first.

Your explanation of everything else was good, but this is incorrect.
For ALL aircraft - conventional, canard, tandem - doesn't matter - the
CG MUST always be ahead of the aerodynamic center (center of lift,
center of pressure, neutral point - all terms are sometimes used
interchangeably) for positive static stability in the pitch direction
to exist. Put the CG behind the AC and the plane becomes unstable in
pitch - the further back, the more unstable and harder to fly.


Eikes! You are correct of course. I know this, and that is part of the reason the canard configuration is more
efficient; all the flying surfaces are countering gravity...
Well, I get a B- on this one ;-)


In ALL aircraft, the front wing must stall first to avoid deep stalls
and maintain control in the stall to allow recovery. In canards (one
of which I built and fly), as in all planes, the stall is not a
complete loss of lift, but either a leveling off or a slight drop in
lift as the AOA increases.

This has been a bizarre discussion for this engineer, because by definition, if you separate translations from
rotation, all rotation occurs about the CG of a mass.

And with respect to the four-bar linkages in cabinet hinges (and car trunk hinges, etc.), depending upon the design,
center of rotation of the moving member (door, trunk, etc.) can be continually changing.

And for our friend from OZ, statements like "totally wrong", "clueless" and your insult of Gerry Caron don't really
add anything to the conversation.

--
Marc J. Zeitlin
http://www.cozybuilders.org/
Copyright (c) 2008 http://www.mdzeitlin.com/Marc/