RE: What RTF or ARFs roll fastest?
Most any short coupled plane with over size controls will spin very fast. Make it really light weight and add huge control surfaces and shazam!!! I know you are an ARF person but I will give you two really hot rod planes you would have to build from plans. Go into MAN plans just for fun and look at the Fun Fly Hots, Mr. Santich really out did himself on this one. While you are in MAN plans go look up the Knight Twister Imperial, this is a bigger plane and again designed by Mr. Santich. Both of these planes got with the program. The Bipe with twin ailerons was something to behold. By just looking at these planes design it will give you and idea about control surfaces and coupling. I think Gene just built the NOTFORSALE from MAN plans, that's one I haven't ever built but it really gets with it.