The TT Corsair has a ply bulkhead halfway between the wing and tail that the pushrod runs through, and seems to eliminate any flex. The TT Mustang has the same style pushrod set up minus the bulkhead, and elevator responsiveness seems good wide-o. Another test flight (at altitude!
) will answer some questions. How did your tygon motor mount work out on the Hayate? Posting a pic or two might help some warbird racers solve the tricky motor mounting task on most of the kits used in the class. It would also come in handy dialing in thrust angles, which are usualy altered by ditching the stock motor mounts.