I finally got the field approval for a McCauley C58 86" inch prop, and fired up the P-Ponk for the first time today. Kudos to Dustin and Matt Lawson of Lawson Aviation for their help!

https://www.youtube.com/watch?v=d2WOvRL ... e=youtu.be

Ron

Nice, sounded great. I am going to do a pponk on my 180h and want to get field approval for my mac 88 inch
jake

Nice!! What crankcase do you have---an early Phase 1 that would have been original K or a later 2 or 3?

Your going to love that combination !

Phase 1 - I spoke with Steve Knopp at length, and he doesn't feel its an issue. He knows of numerous high-time early cases that have no problems.

Ron

I have some preliminary performance numbers on my P-Ponk'd C180B from the 2 hour break-in flight. Calculations were done using the method described in:

http://www.kilohotel.com/rv8/rvlinks/ssec.html

as I flew around in triangles over nearby airports at a relatively high power setting for an hour, followed by an hour of alternating high and medium power settings. Leaning was accomplished old school by pulling out till slight rough then advancing to smooth.

At 5000 ft, 4800 pressure altitude and 38-39 deg F, 8 runs showed 143 KTAS at 15.1 gph (23" 2300 RPM ~70%), and 136 KTAS at 12.7 gph (21.5" 2200 RPM ~60%). No measurable oil consumption, either. Not bad for the 56 year old girl!