I got a Dago Mustang with a Y.S. 91, great combo. I didnt reinforce anything and its been a great flying airplane, a pleasure to fly. I fly from a grass field and the retracts havent been a problem. I have a 13x11 prop for ground clearence and have to kill the engine to get it to slow down to land. Put the Y.S. 110 in you will not be sorry. I did put the battery in the radiator scoop for balancing.