RE: Ace Extra 230 33% Fiberglass
Those following this thread, Iwas able to eliminate the twist in the airframe using Sensei's diagonal bracing recommendation.Iinstalled the wing tube through the fuse and supported it with a pair of parallels (one on each side), and supported the tail on another parallel just ahead of the last former. Iused a 5 lb weight at F-2 and another 5 lb'er on the tail wheel plate - adjusted perpendicularity at F-8 and epoxied the basswood diagonals. Icouldn't put the airframe assembly back in the rail/fixture due to the additional stringers along the bottom, so the above was accomplished on a large glass table with the airframe inverted.
The 3 sets of diagonals shown along with the tail wheel plate were sufficient to remove the twist after the weight was removed. Obviously the stab will be epoxied to the opposite side. The airframe is now extremely rigid, and perfectly flat again across the top. I strongly recommend to all who are building this airframe design, to use diagonals. The frame as shown is 1.92 lbs (875 grams).
Sensei, the name fits.Thanks for the advice.