"John B." wrote in message
...
On Tue, 27 Sep 2011 23:23:50 -0700, Beryl wrote:
Richard wrote:
On 9/28/2011 12:28 AM, Beryl wrote:


No an aircraft's mass changes as fuel is consumed or something falls
off. But you seem to be forgetting that lift changes. Note also that
the CL moves as lift changes. You seem to be thinking of a static
device when you talk about 200 lb. to hold the tail down at 200 mph
then it only takes 200 lbs at 500. That is wrong, the forces acting on
an aircraft change, rather radically, with changes in speed; among
other variables.

If your thesis was correct there would be no need of trim tabs at all.
Just built it in and away we go.
John B.

http://www.av8n.com/how/htm/aoastab.html

The Mustang's wing is symmetrical top and bottom, as you can see by sighting
down it from the wing tip.
http://www.aviation-history.com/theory/lam-flow.htm

jsw