nitrohunter, Every thing else being equal, a heaver airplane will require more airspeed to become airborn (takeoff), and more airspeed to maintain flight than a lighter version of an identicial airplane. So, all a larger engine will do is get the plane up to flying speed quicker for takeoff. If your flying off tall grass with a short runway this may help you on take off. Thats all! Once in the air at altitude you will back off the throttle and fly at 1/2 throttle or whatever is needed to maintain airspeed for flight. I have a Great Planes 40 size Cessna ARF powered by an O.S. .46 FX, just flew it last Saturday, and flying off grass the .46FX gets it airborn with ease. If your Cessna 182 is similer in size then a .46FX or .46AX is great but if you still want to upsize the power then an O.S. 55AX will fit right in as it is the same outside size and weight, just more $$$$.