The choice of a engine in this plane if it were mine is the biggest i can get in without making it a lead sled. You must look at the finished weight. Before you finish the plane tho you must know what engine is going into it so you can balance it correctly. That means you have to have the engine mounted. If you look at the BME 110, the are very light so you may have to use lead or big batts to balance or use a heaver engine and then smaller batts in the tail. Your choice. Dennis