Raideron...
F102's that's a while back :-)
You should really try to come during late july or august. You seem to have missed a lot of what Iceland has to offer.

No I did not have to add weight or mess around with the balance, it was perfect from the start. My engine is the OS.91 with a pump and the battery sits above the wing, appr. on the CG or just in front of it. The CG seems fine at 5 3/4 or so. JR DS-811 servo's all around except for a JR 8231 on rudder.
This OS is happy with the 15x4w prop and it seems to be a very good setup for the kind of flying that fits the UCD best, i.e. leisurely 3D at a docile "walking pace". I seldom throttle it over 3/4 except for quick recoveries or uplines. Haven't tested other props really. This engine is real nice, only one flame out during a gallon's worth of flying time(more time than one would expect dure to the sparse use of throttle) I have not bought an un-pumped engine since then. I got hold of a couple of YS now and fired up the .63 yesterday. It's awesome. Can't wait to test the 1.10 that's going into a 62" Edge.

The undercarriage block on the UCD separated from the fuse on the first or second harrier landing, which turned out to be necessary to get the right amount of glue in there and fix the missing pins which don't go all the way through to the front bulkhead like they should. I also broke the fuse once by hiting the ground lightly with a wing tip. The wing was unscathed but the force on the wing made the fuse separate completely behind the cockpit. Quite simple to repair and the resulting, minute extra right thrust seems to have had a good effect on the flying characteristics really :-D

I use about 30° spoilerons for impressive, rock steady harriers and elevators. Can't do rolling maneuvers myself but my 16 yr old is a wizard at it. He does not like the UCD because of the unstable knife edge but he is too skilled for his own good
I love to fool around with this plane and impress the old geezers with what little amateur 3D I can perform.

Cheers.

Björn