Paul Domeier wrote:I have a MCM69/50 on my O200. Seems like the perfect match for the engine. With 1/2 fuel and no passenger in cool weather, I climb 1100 fpm (75 mph @2600 rpm, cruise is 113 mph at 2550 rpm, and my plane is fat (1018 lbs)
On hot days with a full load the 69/50 gets about 350 fpm. I wouldn't to want try that with a 69/54.
Paul, do you have metal or fabric wings? Our plane is fat too, and we have a 1A101DCM6948 on our O-200 and indicate 90 mph in cruise at 2450 RPM on a 70*F day at 3000'. Summer climb performance is comparable, getting about 300 fpm on a 90*F day fully loaded with the power back to 2550.
Our static RPM is closer to 2600 (over 100 more than the 2425 +/- 50 in Gary Rice's STC), so our prop might be pitched so low it's more or less spinning free and not grabbing much air. Wrinkly, metalized wings wouldn't help, either.
BTW, add us to the list of straight-leg 140s without extenders! We removed the ugly things last week, flew it January 1st. I don't see how people were flipping them over, the tail is still plenty heavy. Just give the brakes a break!