effect of changed thrust line.

In article
,
Alan Baker wrote:

In article ,
Jim Logajan wrote:

Alan Baker wrote:
Jim Logajan wrote:
Running the thrust line through M does _not_ guarantee you wont get
any couple.

It guarantees you won't get a couple from the thrust.

I think I see one of your problems. How many forces are needed for a
couple? Can one of those forces pass through the center of mass?

One. There only has to be a one force on a body in order for it to
experience to angular acceleration. That force just has to act on a line
that is not through the centre of mass.

I apologize, I was using the term "couple" incorrectly.

But that doesn't matter to my argument. So ignore the first bit and
answer my questions below:


Questions for you:

Do you believe that in the absence of any other forces, if the
aerodynamic forces act on a line that is not through the centre of mass,
will the aircraft experience angular acceleration?

If you add thrust acting through the centre of mass to the situation,
will it change the angular acceleration?

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