michpittsman,

You sound like you really know what you are talking about.

I posted a question at (http://www.rcuniverse.com/forum/Four...1431127/tm.htm) that I bet you could answer.

I do have a request for you in response to a comment you made:

>Pitch coupling ( there is also roll coupling, where the model wants to roll with
>rudder application) is the product of the relationships between the thrust line,
>center of gravity, wing and stab location,
>rudder area center, and dihedral when rudder is applied.

Could you elaborate, please? I am interested in knowing how pitch coupling is affected by these variables. For instance, given one of the pattern planes you mentioned ( "Some pattern designs like the Eyeball and Banshee tried to eliminate it by putting thrust line, wing and stab location, and rudder area all on the same horizontal line." ) what would happen to pitch coupling if each of the variables you mentions were changed. I am interested in a chart, kind of, like this:

Variable Change Affect on pitch coupling when rudder is applied
CG Moved Foward Pitch to Belly (or cockpit)

I am mostly interested in what happens when you move the horizontal stabilizer up or down.

Thanks

Chad H