Red, Just looking at the photo again and I'd start with about 5 to 8 Deg. and see what kind of lift-off you would get. Mabey Ali can chime in here. I know he's getting ready for Fl. jets so he may not even be Mon the forum. He flys a lot of turbine sail planes like this. I have a 3.2 but have not put a turbine on it. You did a nice job on that one. I like the lines on it. Hope you get some video of it the next time you take it out.