There is a fellow at my field with a twinstar with a few O.S.61's with 11x7 airscrews. It has the big 3 inch or 3.5's not sure which. He has working flaps installed, an fuel blatters pushes in the center of the wing ribbing. Without flying wot or doing an tricks with it, he can stay in the air almost an hour an a half. The plane cruzes at 65mph, which is almost half throttle. This guy has his wife drive his truck while he flys this plane. Not my thing, but oh well.He flew this thing from Mcallister OK, to Canadian,Ok right up Hwy 69. Pulled into the field an jumped in the pattern for ten mins or so, then droped the flaps an brought it in. with flaps this thing still lands hott. weighs 15 pounds. .....Nice plane but to much punch for me.