I don't know of any sport bipes in this size. There are several in the 40 size and a few in the 120 size but not much in the 90 4 stroke size. I have a 40 size GP ultimate and a 62 inch Lazy ace bipe with a TT91 4 stroke on it. I am currently looking for a 60/90 size ultimate or something similar. Dave Patrick has a nice 120 size and Sig makes a nice ultimate. They are a little expensive but are very nice planes. If you find something in the size that you are looking for post it here as alot of people are looking for something like that.

Rick