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08-02-2017, 08:30 AM
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Join Date: Jul 2017
Location: Sherwood Park, AB
Posts: 27
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My goal is not to squeeze out any more performance, and I certainly don't want to exceed Vne. My goal is to not have to have the compromise of climb or cruse performance but to get both.
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08-02-2017, 08:50 AM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,768
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Most RVs have a speed ratio between top speed and stall approaching 4:1.
The speed range of the RV-12 is closer to 2.5:1. You will see very little improvement with a constant speed prop within this speed range.
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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08-02-2017, 09:06 AM
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Join Date: May 2006
Location: Pocahontas MS
Posts: 3,884
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Mel,
I don't read his goal as expanding the speed range. I read it as expanding the *performance* envelope. With a controllable prop, he gets to keep the top end speed, possibly with better fuel efficiency, and get significant improvements in climb performance.
To OP: There are several electric prop options that are purpose-built for the 912/914 series engines. Most are European or Pacific region products, since we lead the world here in the USA in technology.....
Charlie
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08-02-2017, 09:09 AM
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Join Date: Apr 2007
Location: Redding, CA
Posts: 33
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Have you considered a ground adjustable prop. If so, Whirl Wind has them and very reasonably priced.
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08-02-2017, 09:10 AM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,768
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Quote:
Originally Posted by rv7charlie
Mel,
I don't read his goal as expanding the speed range. I read it as expanding the *performance* envelope. With a controllable prop, he gets to keep the top end speed, possibly with better fuel efficiency, and get significant improvements in climb performance.
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I didn't mean to imply that he is looking to expand the speed range. I was simply stating that a C/S prop will produce little improvement over F/P on an aircraft within the speed range of the RV-12.
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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08-02-2017, 09:47 AM
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Join Date: Jul 2017
Location: Sherwood Park, AB
Posts: 27
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Quote:
Originally Posted by rv7charlie
Mel,
I don't read his goal as expanding the speed range. I read it as expanding the *performance* envelope. With a controllable prop, he gets to keep the top end speed, possibly with better fuel efficiency, and get significant improvements in climb performance.
To OP: There are several electric prop options that are purpose-built for the 912/914 series engines. Most are European or Pacific region products, since we lead the world here in the USA in technology.....
Charlie
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Thanks Charlie. I know the Virus SW uses an electric CS propeller. I believe it is an MT... I will start digging. 
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08-02-2017, 03:34 PM
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Join Date: Dec 2007
Location: Brentwood, CA
Posts: 659
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Airmaster has CS props that will fit Rotax. I provided a PN earlier that will fit the UL engines.
__________________
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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