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  #1  
Old 02-07-2017, 06:26 AM
Larry DeCamp's Avatar
Larry DeCamp Larry DeCamp is offline
 
Join Date: Apr 2010
Location: Clinton, Indiana
Posts: 530
Default Catto 3 blade Pireps ??

I am finishing -4 with 180HP 0360. Nicole advises their latest recommendation is a 68 X 75 for 3 blade with 2650 RPM at 8,000DA. Does anyone have experience with this combination to use for reference. I know Craig is fantastic, just looking for data points that might apply to me to discuss before ordering.
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  #2  
Old 02-07-2017, 07:02 AM
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Location: Dallas area
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I don't think you can beat Nicole/Craig's recommendations. They know what they are doing.
I've been flying behind their props since 2003 and couldn't be happier. I'm set up for 2750 @ WOT/8000'DA because of my short strip.
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Mel Asberry..DAR since last century
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RV-6 Flying since 1993
175hp O-320
3-Blade Catto (since 2003)
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  #3  
Old 02-07-2017, 07:24 AM
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blackbeard10 blackbeard10 is offline
 
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Location: OH
Posts: 173
Default Catto prop

Very happy with the 3 Blade Catto on my 4.
Changed from Whirlwind GA prop.
Happy to discuss on the phone my experience.
I sent my phone number via PM.
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  #4  
Old 02-07-2017, 08:41 AM
vic syracuse vic syracuse is offline
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Every customer for which I installed one is very happy. Better cruise and climb performance, and very smooth.

Vic
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  #5  
Old 02-07-2017, 08:53 AM
Robert Anglin Robert Anglin is offline
 
Join Date: Mar 2008
Location: houston, texas
Posts: 719
Default + 1 for Mel.

I agree with Mel on this one. We don't run a Cato but if you look at the numbers Put out by Lycon and most of the old prop charts, 2750-2800 is a good medal road figure to try and get WOT down low. I think the number that I have heard down through the years is 105% of max. rated RPM at WOT down low and 100% up at 7500' D.Alt. or for the 320 and 360 2700 RPM's. This is what we have and are very happy with the take off and cruse medium.
I would think you will be mostly on the top end of the cruse with 2650, WOT, down low, But yes Cato knows these RV's.
Hope this helps. Yours, R.E.A. III #80888
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  #6  
Old 02-07-2017, 10:34 AM
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titanhank titanhank is offline
 
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Location: Friendswood, Tx
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My 160 hp -6 with a nle 3 blade 67x70 catto will turn 2660rpms at 8000ft da doing 182.5 mph from a 4 way gps run. Static rpm is 2160.
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  #7  
Old 02-07-2017, 11:01 AM
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grubbat grubbat is offline
 
Join Date: May 2012
Location: Ga
Posts: 508
Default Yep

If I didn't have a constant speed prop already, I would definitely go with a Catto three blade prop. I had a three blade on my -6a and it was very smooth and was a climber. Getting the cowl off was a little bit tricky.
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  #8  
Old 02-07-2017, 07:28 PM
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snopercod snopercod is offline
 
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Location: Asheville, NC
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Default power-off glide ratio

The 3-blade Catto props offer great cruise performance and less vibration. I only had two complaints: I only got 2,100 RPM on takeoff so my performance sucked until I build up some airspeed. The second thing is that with three blades out front, your power-off glide ratio will be MUCH worse than with a two-blade prop.
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  #9  
Old 02-07-2017, 09:13 PM
sandifer sandifer is offline
 
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Location: NC
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Quote:
Originally Posted by snopercod View Post
The 3-blade Catto props offer great cruise performance and less vibration. I only had two complaints: I only got 2,100 RPM on takeoff so my performance sucked until I build up some airspeed.
That of course depends on the prop pitch you select. Craig can build anything.

Quote:
Originally Posted by snopercod View Post
The second thing is that with three blades out front, your power-off glide ratio will be MUCH worse than with a two-blade prop.
That's an interesting observation, and I'm curious how the RV platform would differ so much from my experience and extensive testing between running a 2-blade metal Sensenich and four different 3-blade Cattos on my Pitts S-1S. I did not notice any increase in drag associated with the 3-blade. In fact, it seems my glide ratio shallowed very slightly only because with such a lightweight prop, you must bump your idle speed up slightly compared to what can be achieved with a metal prop. And even at that, I have my idle set with the Catto that I sometimes must be careful to blip the throttle to keep the engine running during spins. My glide ratio definitely did not steepen with the 3-blade Catto. RVs are floaters compared to the Pitts, and the only prop change I can imagine significantly affecting the glide ratio in an RV would be going from a FP to a CS prop.
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  #10  
Old 02-07-2017, 09:55 PM
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Planecrazy232 Planecrazy232 is online now
 
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Location: Cape Coral
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Default My Catto observations

I went from a two blade Sterba wood on my O360 RV6A to the 3 blade Catto 75" pitch. I'm within one or two knots of my original speed.

Two observations: I second the comment above about glide ratio. With my Sterba when I pulled the throttle back it was like the plane was on ice. To reach flap speed I would have to pull the plane up to slow down. With the three blade, the speed is very linear to the throttle settings. Pull the throttle to idle and it's like putting brakes on. I actually find it much more controllable in the pattern.

Also there is much more P factor. Lots of right rudder on climb and lots of left rudder on descent, something I've never experienced before.
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