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  #11  
Old 06-03-2011, 08:52 PM
Greg Arehart's Avatar
Greg Arehart Greg Arehart is offline
 
Join Date: Jul 2007
Location: Delta, CO/Atlin, BC
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I agree with others, your static RPM is way low and you need a different prop. However, given the situation, my answer would be to climb at a better angle initially, as long as it doesn't cause other problems (like overheating).

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RV-9B (Big tires) Tipup @AJZ or CYSQ
N 7965A
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  #12  
Old 06-04-2011, 05:25 AM
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apkp777 apkp777 is offline
 
Join Date: Oct 2008
Location: Schaumburg, IL
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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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Last edited by apkp777 : 06-04-2011 at 05:30 AM.
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  #13  
Old 06-04-2011, 10:42 AM
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Leland Leland is offline
 
Join Date: Jan 2005
Location: Livermore, California
Posts: 146
Default 66X70 Catto

My 3-blade 66X70 Catto prop on an O320 driven -9A has a static RPM of about 2250 with a full throttle speed of 189 mph at about 2600 RPM. Craig can fine tune the outer few inches of your prop to change the static and full-throttle RPMs.
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