at the risk of bogarting this thread, I am going to post the results of a little CFD study I am doing in my spare time.....

I will first run the same model at 30 degrees beta with the horiz-stab in 3 positions.... "Low", "High" and "Centered"
Hope to discover any stab position impacts on yaw-pitch coupling....

Initially.. there are no thrust forces. For simplicity and to isolate the stab location effects, I have decided to not include
the thrust nor the spiral slipstream from the prop. Perhaps later I will add this boudary condition....

So the first set of images is of a popular scale aerobatic plane called a Yak 55. This virtual "Model" has a 78" wing
so similar in size to our pattern planes. I have located the stab in the low position
for this first run. Included are several images showing the pressure distribution and the surface vectors on the plane.
Though the vectors (Tufts) are interesting to look at, nothing is immediately revealed by these vectors.
The resulting Nose-Up-Pitch is revealed by interrogating the pressures on the horizontal tail... and it is here that
a small net force is measured pulling or pitching the plane towards the canopy.
Incidentally... there is also a Adverse Roll induced by this yaw as well...(Rolling moment opposite the rudder direction)
the last two images show the pressures on the top and bottom of the hz tail.... one can just barely see that the lower
side is slightly less pressure than the top side.... the actual measures force is about 5 ounces....
(Blue = low pressure, Red = high pressure)