Gotta Love this engine! I have two in planes I'm curently flying. 1 in a cermark extra using a Bolly Clubman 13.5x8 loves it! I also have one in my Cermark 60 size F-16. With a tuned pipe turning a 11X9 APC at 12,900 static. This thing Really screams. They both run awsome. the Extra's from Italy the F-16's is from the orient. Both run the same Sweet! I have two more on the shelf for F-4 Great Planes Jets when time allows..