I don't mean to say that mods and reinforcements should be considered a fact of life with ARFs. I just think that the UCD is quite a lot of plane for $189.

GP does listen to us buyers too. The box my UCD came in has stiffening plywood sheets secured to the sides. My guess is that they were put in later as a fix to address shipping damage issues I read about.

BTW, I tried pulling the firewall loose with all my might tonight, and nothing happened. Okay, I'm no Arnold, but I would think what I can muster is a heck of a lot more than even the most stout engine you could possibly mount on the UCD. Vibration in time could work the firewall loose, but that's true with any model. May be some of you just got lemons, unfortunately.