46 fx
#1)OS46FX with Macs muffled pipe and header
15% Omega
APC 9X9
15000RPM
about 500 feet above sea level
#2)Os 46 Fx (post # 1)
Homebrew 6%, 18% aerosave, stock muffler w. deflector, modified 12,25x3,75 apc = 14200rpm.
#3)Tower .46BB 11x4 MA 16.2K Tuned Pipe 15%N, 21% (80/20)
#4)Magnum XLS 40A ABC 11x4 MA 15.6K tower muffler 15%N, 22%
These are actual data. The prop loads are all about the same. The jetts are better but not by as much as you would like to think.