Robbie, that sort of implies that the OS 46 AX is only good for beginners and that experienced people would do better with something else, which I am sure you will agree is just not so. My pattern friends, one of whom has been flying for over 36 years, flys pretty much with OS engines on his pattern planes, and highly recommends the OS 46 for anyone that would ask, regardless of experience.

I've never tried GMS, but I am sure they are fine engines. One of the guys I fly with has one and loves it.

CGr.