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  #1  
Old 08-01-2017, 08:45 PM
LeoKenner LeoKenner is offline
 
Join Date: Jul 2017
Location: Sherwood Park, AB
Posts: 6
Default Constant speed prop for RV-12 Expermental?

Has anyone done a constant speed propeller for an Experimental RV-12?
I would much rather go that route than the ground settable option.

I know in the US it is simpler to register as LSA, but in Canada the RV-12 will be an experimental either way so I don't have to worry about any of the LSA restrictions.
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  #2  
Old 08-01-2017, 08:58 PM
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rongawer rongawer is offline
 
Join Date: Dec 2007
Location: Brentwood, CA
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I didn't do it, but I do go through an evaluation and found one that would be a good fit. An Airmaster AP431CTF-WWR66U. The downside is the USD $9850 retail price, but you can get it for around $8800 from Ray L. at Kaolin Aviation, who is a US dealer.

For me, the price wasn't worth the potential performance gain.
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- RV-12 N975G, SN 120840, Build in progress...finally on the finishing kit, so, something like 90% done and 90% left to go.
- 1975 B58 Baron, N1975G (a bottomless money pit that makes building an RV look like lunch money, but it's a great airplane, hauls the family and my wife likes two engines...go figure)
- 1961 A33 Debonair, N433JC (R.I.P.)
- RV7A; didn't finish it and donated to kid's club
- Zenith CH601XL; flying somewhere in Louisiana https://youtu.be/wa_Y_A_rP_8
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  #3  
Old 08-01-2017, 09:18 PM
rv9builder rv9builder is online now
 
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Location: Irvine, CA
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Any idea what the performance gain would be in cruise and climb?
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RV-12 Project: Working on Empennage
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  #4  
Old 08-01-2017, 09:23 PM
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rongawer rongawer is offline
 
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Determine the top speed of your RV-12 with the prop pitched for cruise, and then the best climb rate with it pitched for climb. That's the performance of the constant speed prop.
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Ron Gawer

- RV-12 N975G, SN 120840, Build in progress...finally on the finishing kit, so, something like 90% done and 90% left to go.
- 1975 B58 Baron, N1975G (a bottomless money pit that makes building an RV look like lunch money, but it's a great airplane, hauls the family and my wife likes two engines...go figure)
- 1961 A33 Debonair, N433JC (R.I.P.)
- RV7A; didn't finish it and donated to kid's club
- Zenith CH601XL; flying somewhere in Louisiana https://youtu.be/wa_Y_A_rP_8
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  #5  
Old 08-01-2017, 09:39 PM
rv9builder rv9builder is online now
 
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Location: Irvine, CA
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Thanks, Ron. Since most RV-12s have a fixed-pitch prop that is a compromise, I wonder if anyone has tried to fly one in "max cruise" or "max climb" mode? I wonder what the gain would be at each extreme end of the range—maybe an extra 5 knots in cruise and a few hundred feet per minute in climb? Who knows!
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RV-12 Project: Working on Empennage
RV-9A Project: Sold

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Last edited by rv9builder : 08-01-2017 at 09:47 PM.
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  #6  
Old 08-01-2017, 10:28 PM
Driftdown Driftdown is offline
 
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Location: Clearwater, Florida
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If you alter an RV-12 with a constant speed prop, in the USA, wouldn't that take the airplane out of the LSA category, as per FAR's?
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  #7  
Old 08-01-2017, 11:42 PM
rv9builder rv9builder is online now
 
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Quote:
Originally Posted by Driftdown View Post
If you alter an RV-12 with a constant speed prop, in the USA, wouldn't that take the airplane out of the LSA category, as per FAR's?
You are correct that it would no longer qualify as an LSA. However, it could be registered as E/A-B. But with a constant-speed prop, it could not be flown by a Sport Pilot.
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RV-12 Project: Working on Empennage
RV-9A Project: Sold

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  #8  
Old 08-01-2017, 11:48 PM
redbaron redbaron is offline
 
Join Date: Aug 2013
Location: Lucerne,Ca
Posts: 178
Smile constant speed prop

in the US it would in eab , the add at is a neg. speed fairings might be a better plan.
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  #9  
Old 08-02-2017, 05:01 AM
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joedallas joedallas is offline
 
Join Date: May 2010
Location: Spring Hill Fl
Posts: 646
Default Top Speed ?

Also remember the 12 was designed as a light sport and cruising much faster for long period of time will add stress on the airframe that the 12 was not designed for.

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Joe Dallas





Quote:
Originally Posted by redbaron View Post
in the US it would in eab , the add at is a neg. speed fairings might be a better plan.
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  #10  
Old 08-02-2017, 07:38 AM
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DaleB DaleB is offline
 
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Location: Omaha, NE (KMLE)
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CS prop or no, you're not going to get much more speed out of an RV-12 without an engine swap. You might squeeze 125 kt out of it... but it's not like you're going to exceed Vne or anything.
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