Two or three years ago, at the Warrenton, VA East Coast Aerobatic Contest, a local T-28 owner entered and flew Primary. He started higher than the top of the box so that he has plently of room for the spin. He flew safely, I think that he scored OK, and the gallery was greatly entertained. Have not seen that since though.

Competition aerobatics has several dimensions of performance that you must manage. One is that the box is 3500' wide, 3500' deep, and 3500' high. I will hazard a guess that in a large, heavy, machine like a T-28 the box seems really really small and wrestling it through the figures in that space is really really hard work. Its an arena for ballerinas, not WWE wrestlers.

Wes
N78PS