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  #1  
Old 12-27-2015, 04:22 AM
Tiger 74's Avatar
Tiger 74 Tiger 74 is offline
 
Join Date: Oct 2012
Location: Chichester, UK
Posts: 36
Default Engine/prop combination

Hi all,
I have done around 25 hrs in my (purchased) RV3a (G-RODZ formerly N68AR).
It has around 480hrs total time on it and as far as I can see from logs, it has had the same engine/prop combination throughout - Lyc 0-320 E2A and Culver wood 68/68.

I find the prop too fine, as it red lines the rpm with a handful of throttle left to go, and only achieves around 140 knots flat out. It does climb very well though.

My question is, as this engine/prop combination has suited the previous owners, is this the best set up as a compromise between speed and climb?

For me, I would prefer to utilise all the RPM range, sacrifice a little climb performance, and get a better top speed.

My 8 will be flying soon and I then want to refurbish the 3 and use that opportunity to improve performance. Can anyone suggest a new prop for my existing engine, or a better engine/prop combination?

Thanks, and Happy New Year!
David
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  #2  
Old 12-27-2015, 09:22 AM
aerhed aerhed is offline
 
Join Date: Dec 2008
Location: Big Sandy, WY
Posts: 2,565
Default

Check your PM's
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  #3  
Old 12-27-2015, 11:31 AM
CAVU Mark CAVU Mark is offline
 
Join Date: Dec 2014
Location: San Diego, CA
Posts: 88
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I would like to know any recommendations as well. Have a O-320 with a 62 inch prop and am deciding my next step.
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  #4  
Old 12-27-2015, 11:38 AM
David Paule David Paule is offline
 
Join Date: Dec 2009
Location: Boulder, CO
Posts: 3,663
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Just from reading other posts on VAF, perhaps it's worth giving Catto a call.

Dave
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  #5  
Old 12-27-2015, 11:44 AM
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N941WR N941WR is offline
 
Join Date: Jan 2005
Location: SC
Posts: 11,807
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Quote:
Originally Posted by David Paule View Post
Just from reading other posts on VAF, perhaps it's worth giving Catto a call.

Dave
Yes, give Craig Catto a call.
http://www.cattoprops.com/

My -9, with it's original O-290d2 and Catto prop would top out at 140 knots and it is a bigger plane with less hp. I'm sure he will be able to help you.
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RV-9 (Yes, it's a dragon tail)
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  #6  
Old 12-10-2018, 01:49 AM
Chris Cooper Chris Cooper is offline
 
Join Date: Jan 2017
Location: Aberdeen, UK
Posts: 43
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Hi David, if you see this could you check your private messages, I have a question about G-RODZ. Thanks, Chris.
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RV14 - building
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  #7  
Old 12-10-2018, 05:34 AM
oaklandaviator oaklandaviator is offline
 
Join Date: Dec 2014
Location: Somerville, Tn and Little Rock, Ar
Posts: 69
Default Catto

We have a custom Catto on ours with 160 hp and it climbs like a bat out of Hades. My Fixed pitch Sensenitch 180 hp RV-8 gets left in the dust when the wife throttles up the 3. The 8 was showing 173 knots true when she left me. Don't have the same instrumentation in the 3 so don't know what it's actually doing. Probably pushing 180 knots flat out.

Catto works magic in my opinion. No need for a constant speed on the 3 with this kind of performance.
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  #8  
Old 12-10-2018, 10:51 AM
dnh98221 dnh98221 is offline
 
Join Date: Oct 2018
Location: Anacortes
Posts: 5
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I have a Catto prop on my -3 (O-320) and at about 8000 feet da I get a flat out redline right at engine redline of 2700 RPM truing at about 160 knots. The climb performance is well above 1500 fpm.
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  #9  
Old 12-13-2018, 01:30 PM
dlomheim dlomheim is offline
 
Join Date: Sep 2006
Location: (2OK2) OK City, OK
Posts: 366
Default RV-3A Performance

Quote:
Originally Posted by Tiger 74 View Post
Hi all,
I have done around 25 hrs in my (purchased) RV3a (G-RODZ formerly N68AR).
It has around 480hrs total time on it and as far as I can see from logs, it has had the same engine/prop combination throughout - Lyc 0-320 E2A and Culver wood 68/68.

I find the prop too fine, as it red lines the rpm with a handful of throttle left to go, and only achieves around 140 knots flat out... David
The RV-3A I restored and flew for a year w/an O-290"G" (125hp) would max out at 185 mph (160 knots?) at 1K, so you must have a fabulous ROC with that prop!

Doug
RV-3A sold
RV-9A FWF
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  #10  
Old 01-07-2019, 04:49 PM
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dacronwall dacronwall is offline
 
Join Date: Oct 2013
Location: Palo Alto,CA
Posts: 91
Default Prop selection

As others have said, you should call Craig Catto. I had the same issue when I bought my plane with the Vans FP Sensinich prop 70CM x 79 if I remember right.
I flew my RV-3 over to his shop, and we bolted on a test prop from an RV-6 race plane. I took that up and got climb performance numbers first, and then flew a triangle course at 7,500 ft with 5 minutes on each leg, recorded the data and came up with good averages.
He then built me a custom twist for my plane. It is a freekin claw. I am now bumping up against 200 kts level flight at 2850 rpm. It has sacrificed some climb performance, but really...It climbs at 1750 ft/min at 140 mph so I will take the top speed all day long.
Plan for weight and balance adjustment. My swap took 19 lbs off the nose and I had to get a lighter battery, and move it well forward to compensate.
Well worth it. Never look back. Craig is "The Man"!
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