BME 50
 

After break in:
MSC 22-8 =7,000 RPM with standard muffler, after switching to a Chip Hyde canniser muffler, still 7,000 RPM with a MSC 22-8, but a lot quieter.
Harry Wagner

RE: BME 50
 

bme 50 and pits muffler

xoar 21/8 7800 to 7900 rpms and not much thrust

bme 21/8 7400 and the best thrust of any prop tested including many 22/8 props