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08-01-2017, 08:45 PM
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Join Date: Jul 2017
Location: Sherwood Park, AB
Posts: 27
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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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08-01-2017, 08:58 PM
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Join Date: Dec 2007
Location: Brentwood, CA
Posts: 659
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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.
__________________
Ron Gawer
- RV10, Build in progress.
- RV12, N975G, "The Commuter"...many great hours and happy landings so far.
- Several others that are now just great memories for me.
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08-01-2017, 09:18 PM
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Join Date: Jan 2005
Location: Irvine, CA
Posts: 873
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Any idea what the performance gain would be in cruise and climb?
__________________
Mark
RV-12iS Fuselage
RV-9A Project: Sold
VAF donation made for 2020
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08-01-2017, 09:23 PM
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Join Date: Dec 2007
Location: Brentwood, CA
Posts: 659
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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.
__________________
Ron Gawer
- RV10, Build in progress.
- RV12, N975G, "The Commuter"...many great hours and happy landings so far.
- Several others that are now just great memories for me.
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08-01-2017, 09:39 PM
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Join Date: Jan 2005
Location: Irvine, CA
Posts: 873
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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!
__________________
Mark
RV-12iS Fuselage
RV-9A Project: Sold
VAF donation made for 2020
Last edited by rv9builder : 08-01-2017 at 09:47 PM.
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08-01-2017, 10:28 PM
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Join Date: Jan 2011
Location: Clearwater, Florida
Posts: 398
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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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08-01-2017, 11:42 PM
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Join Date: Jan 2005
Location: Irvine, CA
Posts: 873
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Quote:
Originally Posted by Driftdown
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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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.
__________________
Mark
RV-12iS Fuselage
RV-9A Project: Sold
VAF donation made for 2020
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08-01-2017, 11:48 PM
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Join Date: Aug 2013
Location: Lucerne,Ca
Posts: 272
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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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08-02-2017, 05:01 AM
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Join Date: May 2010
Location: Spring Hill Fl
Posts: 734
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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.
My View
Joe Dallas
Quote:
Originally Posted by redbaron
in the US it would in eab , the add at is a neg. speed fairings might be a better plan.
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08-02-2017, 07:38 AM
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Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 2,247
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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.
__________________
Dale
Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
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