Jackster, Mine makes a ton of torque, turns a 9X6 about 16K and sounds like a hornets nest at full song. It has a puke tube like a 4 stroke and does seam to put out a lot of oil over the bottom of the plane but then it's not really broken in yet. as to whether it will fly a larger plane? Can't really tell you as I have broken 4 props in 5 atempts to fly it and dead sticked on the 5th try. I don't really attribute this to the engine, more to the short coupling of the Waco 30 airframe. I think the deadstick was a fuel delivery problem as I am using a great planes fueling valve that I have my doubts about. Gonna remove it before the next attempt. The engine makes enough power that it feels like it would take off right out of my hand if I would let it but bipes need a certain amount of airspeed to fly so I don't think that is an option.