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  #11  
Old 08-02-2017, 08:30 AM
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LeoKenner LeoKenner is offline
 
Join Date: Jul 2017
Location: Sherwood Park, AB
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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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  #12  
Old 08-02-2017, 08:50 AM
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Mel Mel is offline
 
Join Date: Mar 2005
Location: Dallas area
Posts: 9,618
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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.
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Mel Asberry..DAR since last century
A&P/EAA Tech Counselor/Flight Advisor
Specializing in Amateur-Built and Light-Sport Aircraft
<n168tx(at)flytx.net>
North Texas (8TA5)
RV-6 Flying since 1993
175hp O-320
3-Blade Catto (since 2003)
FRIEND of the RV-1
Eagle's Nest Mentor
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  #13  
Old 08-02-2017, 09:06 AM
rv7charlie rv7charlie is offline
 
Join Date: May 2006
Location: Pocahontas MS
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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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  #14  
Old 08-02-2017, 09:09 AM
EAGLE BOB EAGLE BOB is offline
 
Join Date: Apr 2007
Location: Redding, CA
Posts: 29
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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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  #15  
Old 08-02-2017, 09:10 AM
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Mel Mel is offline
 
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Location: Dallas area
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Quote:
Originally Posted by rv7charlie View Post
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.
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.
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Mel Asberry..DAR since last century
A&P/EAA Tech Counselor/Flight Advisor
Specializing in Amateur-Built and Light-Sport Aircraft
<n168tx(at)flytx.net>
North Texas (8TA5)
RV-6 Flying since 1993
175hp O-320
3-Blade Catto (since 2003)
FRIEND of the RV-1
Eagle's Nest Mentor
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  #16  
Old 08-02-2017, 09:47 AM
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LeoKenner LeoKenner is offline
 
Join Date: Jul 2017
Location: Sherwood Park, AB
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Quote:
Originally Posted by rv7charlie View Post
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
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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  #17  
Old 08-02-2017, 03:34 PM
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rongawer rongawer is offline
 
Join Date: Dec 2007
Location: Brentwood, CA
Posts: 192
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Airmaster has CS props that will fit Rotax. I provided a PN earlier that will fit the UL engines.
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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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