A 9A with an O-320 (160hp) has caught a friend's eye, but I can't explain to him why there's a placard "Avoid all operation above 2600 RPM". I'm well aware of the need to avoid continuous operation of any prop in the 26-2700 and 2200-2300 ranges because of the natural harmonics of our four-bangers. What's the deal with this Sensenich hard limit? It's a 2008 vintage 70CM and the placard further warns against repitching under 68".
I like my Hartzells and Whirl Winds!
John Siebold
I like my Hartzells and Whirl Winds!
John Siebold