I was just reading Model Aviation magazine, and there's a pic of a Decathlon. The caption talks about the setup, and says the owner is swinging a 12x6 Master Airscrew on an OS 46AX.

Today I tried experimenting with a Master Airscrew 12x5 on my 46AX. There was a VERY noticeable drop in RPM's (no tach today, but I get 13000peak RPM with an 11x5) from my Master Airscrew 11x5. I had to keep the throttle at or above 3/4 for decent flying capability. I burned through a tank of fuel in just a few minutes (I did re-tune for the larger prop), and my engine was HOT when I landed. Now I actually really enjoyed the extra thrust, but can not or will not put my (can't think of one good enough word to describe my AX) engine through that again, as much as I'd LOVE to fly my Dolphin with a 12x5 (Maybe for a few weeks with my new 55AX before the Decathlon is assembled; although I don't want to get spoiled!).

Am I missing something here? I'm running 10% Nitro, but I can't imagine 15% would make THAT much of a difference...