I have an o-320 in my -9. Originally my Catto prop had a static RPM of 2250 and max RPM at 8KDA of 2920 WOT. Yep, you guessed it, wow, was that a climb prop. 2000FPM was no problem at all. Of course cruising around at 2700 RPM sure did make a lot of noise.
So, I sent the prop back to Craig and now my static is right around 2150-2175. My max RPM at 8KDA WOT is 2680. Definitely noticeable climb rate reduction, but still not bad. Maybe 13-1500fpm. Cruising at 2500 rpm will produce about 150KTAS.
Although I am happy with my numbers now, the desire for a constant speed prop is tempting. If anyone would like to donate one to the Tony Phillips Charitable Climb Rate Foundation (C.C.R.F.) that would be awesome. Sorry, no tax deduction however.
For now, I would send your prop back to Catto. He can re-pitch it and get you where you want to be. On his behalf, it's very difficult to pitch props for us RV guys as we all have different engines. Mine is an ECI, which is rated for 164 HP and running dual P-mags, which probably has some HP effect.
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Tony Phillips
N524AP, RV 9 (tail wheel)
Last edited by apkp777 : 06-04-2011 at 05:30 AM.
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