Trail dust, I'm back at work and pulled some equations. Here goes:

The first two equations are for SOLID pieces, I will post the equation for a HOLLOW piece as well, but the idea will be the same. I wasn't able to find a clear equations for the hollow, but the equations I found lead me to believe the trend will be the same.

The section modulus under torsion (Wt) for a square is:
Wt = 0.208a^3 where a is the length of one side.

The section modulus for a rectangle is:
Wt = x*b^2*h, where x is the ratio between the long/short sides (3/2 for our case), b is the short side, and h is the long side

In our case, we have a 2x2 and a 2x3, the square will have a modulus of 1.664 and the rectangle of 2.772, a 40% increase for the rectangle.

Hope this helps..

Maxwedge, post thos pics, or send them to me!!

Tim, where are you?