Oh its a strong motor alright. I've been trying to fly mine as much as possible in this miserable Phoenix heat and have been very impressed with the way it's hurling my 38lb Extra around in 100+ degree weather. Bought a digital postal scale last week and was finally able to accurately weigh the plane only to find out it weighs 39lbs 13.7 oz. With a full load of fuel my pig is over 40lbs! And I thought this thing was ballistic at what I thought was 38lbs. Motor has 3.5 gallons through it now spinning a 32x12 Fuchs @5950. Using MTW TD100's for sound control. Elevation 1700. Oil Amzoil @80:1.