I love my RCS140 I would recomend it for the pattern ship with the rear exhaust and a tuned pipe, should bolt right in a pattern ship. mine is side exhaust in a 120 Pitts s2b from Cermark on an 18x6 Xoar unlimited vertical great torque rolls. pricey but cant be beat.(also my first gas engine) what ever you buy make sure it has the power you want,if you dont you wont be happy with any of the choices you have out there.