A couple of years ago I bought an Alon with a freshly anualed O-200. Incidentally, after a great deal of effort I finally have the field approval for this conversion. The conversion was made following all the plans for conversion on the D model, including the C-150 prop. I have to throttle back a lot to not exceed 2500 rpm. The 69-inch prop is only a little over 68-inches. My true airspeed at 2500 is 105 mph. This is well below the book value. I've calibrated both the air speed indicator and the tach. Question: should I try to find one of the props approved for the C-90?
thanks dnb
