RE: GMS .47 is there a better motor ?
I don't have any factory specs for you, but I can tell you that the O.S is overated by the manufacturer. I have been flying a GMS .47 for 3 years with no problems. In a side by side comparison with an O.S. 46 FX, both engines turning an APC 11X5, the O.S. came in at 12,800 RPM and my GMS came in at 13,700 RPM. The O.S. was running on 10% Cool Power and the GMS on 5% Cool Power. My GMS never fails to start and I think I have had to adjust the low end once. On January 1, 2004 we had our frozen finger fun fly and I flew my SE/GMS combo with the same Carb settings as I used over the summer. If you want an engine that will hover the SE and at the flip of your left hand climb out with authority, the GMS is the real deal!!!