In article ,
"Morgans" wrote:

Let's say the engine is mounted such that it is acting through the CoM,
OK? In that case, changes in thrust cannot *possibly* cause any net
torque, right?

Yep. Drag is not at the center of mass

What does that have to do with my question?

Take the air away for a moment and use a rocket. The only way to place
it such that it won't cause a pitching moment is to align its thrust
through the centre of mass, correct?


OK, move the engine up or down, and if you reangle it to set the thrust
line through the CoM, then the same situation holds true.

Nope. Drag is not at the CoM

Show your work or a reference...

--
Alan Baker
Vancouver, British Columbia
http://gallery.me.com/alangbaker/100008/DSCF0162/web.jpg