I just built the Ultra Stick 40 and have about 15 flights on it. It is an absolute blast to fly.

Ok, this is the problem that I had on mine: You know where the elevator beam that joins the two halves where it passes behind the fuse? Well it hits the tail wheel mount on either extreme of elevator throw. Here's what I did.

1) Carve a deeper slot on the back of the fuse to contain the plastic tail wheel pivot/mount. That way it doesn't hit the elevator. But it can't be too deep or it won't rotate the rudder on its axis of rotation.
2) Cut some of the plastic pivot off. It looks like a little flag. Cut off the end of the flag so it goes in deeper.
3) If it's to late, just carve some of the elevator away. But only in two little spots on either edge. Watch it as it moves and you'll see. Don't cut off any more than you have to.

I actually had to do both and now have 100% max throws. I'd be careful carving too much of the elevator though. I just made the minimum cut, very very shallow to clear the tail wheel pivot/mount. Play around with it until you're comfortable before you glue it in. Take your time. Don't forget the petroleum jelly on the pivot point before you glue it or epoxy might leak into it and freeze up your wheel pivot.

On a side note, I'm now running a 46FX with a APC 10-7 prop and it has plenty of thrust. Hovering is no problem. Yesterday I bought an APC 12.25 by 3.75 prop. I heard that it was a good prop for 3-D on this engine. I'll let you know. And another thing, this thing on max rates is very touchy. I have a switch on my radio and go back and forth and let me tell you, it's a handful on high rates (for me anyway). The rolls are incredible and the elevator sends the thing vertical on a dime (vertically down also..careful).

Joe