I had an Ace 4-120 monowing for my first gasser years ago. Stuck a G38 on the nose of it . Sure was fun until I forgot to plug the ailerons in.[:@] Tough way to learn a lesson.....but.........I DID learn it. I balanced it with the elevator servo's in the tail and rudder on pull-pull I believe. Seeing how there are all the light weight 50cc engines now, I think I would go that route....DA50, ZDZ 50, BME44 or the 50, Sachs 3.2.