ORIGINAL: Flyer Freq
The thing that surprised me though, is that when I tached the engine, I was only turning 12,080 [&o]. In the past, I always ran an 11 X 3 APC, at 16,200 RPM
. When we broke my friends .47 in on a 12 1/4 X 3 3/4 APC, he was turning 14,800 RPM
I recently tached a couple of GMS .47s with stock exhausts with the 12 1/4 x 3 3/4 APC prop while helping set them up. We got between 11,700 and 12,000 at sea level. Your 12,080 seems about right based on my experience with these engines. The 14,800 must have been a false reading.