Originally Posted by tracknoob
One thing that got me last outing though was somehow I was having very reduced elevator authority. Yet when I would preflight it, it seemed to be operating correctly. Well, finally doing a simple (but fast) loop, it just would not pull out, and I crashed it badly. Broken wing, spinner, etc. When I had it on the bench to check out and repair, I found the root cause of my elevator problems: the surface had torn right near the control horn, at the thinnest part, so when it was tested just sitting still, both sides moved fine, but you could easily waggle it to make the sides move separately, like from even the slightest touch, or a breath of wind.
Sorry Guys, I'm a bit late with this reply. I go to sleep and the thread grows another page!
Cases like this are why we do a "positive control check" on full sized aircraft. By this I mean we operate a control while gently holding the surface still. Don't be too heavy handed or damage to a perfectly good control could result, careful handling shows up any problems like what happened here.
I think that I will be doing this mod too. Might look to see if it can be done on the Sbach too, kill two birds with one stone - strengthen the elevator and push the CG back too...