rcworld2000, As to your "should I change to a 12-6 prop" question.....maybe, maybe not. I can't remember what size I ran when it was in tri-gear configuration. Ground clearance with the 1' larger prop is the concern (1/2" less with the 1" larger prop). When I converted the Hobbystar to a taildragger I replaced the main gear with a Dubro fiberglass type that may be taller than stock so a 12" diameter prop clears just fine for me even flying off grass. Check your ground clearance and then decide if you want to try one. It's a "try it and see" choice, as an 11-7 is not a bad choice. If you have a 12-6 in your prop box and it clears well, give it a try. Happy flying