Grumman Ag-Cat
One nice bipe worth mentioning is the Grumman Ag-Cat. Its a little different than an Ultimate, which is a good plane in its own right. You would have to scratch build, as I am not aware of any kits. Check my gallery for pics of mine. It has a 48" ws, now weighs 3 lbs, 2 oz, and is powered with a .30 4 stroke. All of the maneuvers you could want, even hangs on the prop, just does things a little slower. Looks just like a full size Ag-Cat dusting a field when flown in a spray pattern. Is an awsome plane at 48", would be even better bigger.