I have the Carl Golberg Ultimate 1.20, I had a Featherlight 25cc leafblower conversion on it for a couple of years. It flew great, balanced with a couple of ounces on the tail (put it near the tailgear) and had a great time. Came out a little over 11 lbs. When I purchased a Balsa USA Fokker Eindecker (80" wing) I put the conversion motor on that and put a 1.20 OS fourstroke on the Ultimate. The conversion motor will not do 3D, has very little power actually compaired to the OS1.20 (I think it was the weight issue) but it was still alot of fun to fly. There is actually a thread on here where people posted pictures of thier Ultimates with 25cc conversions on them. Here is the thread of one of them.

http://www.rcuniverse.com/forum/m_17...tm.htm#1757270