I have a Freestyle that has been lying around because all I had to put in it was a Magnum .52 XLS which flew fine, but was underpowered for the plane's real potential. I have an OS .91 FS on another plane that is also underpowered. Thinking about putting the .91 on the Freestyle. Does anyone fly this plane and how big is the engine you have on it? I'd like to know how high I could go. I'm thinking that something like a Saito .72 is as big as I can get, but I'm not sure. Thanks, in advance, for the replies.