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  #311  
Old 04-15-2019, 09:45 AM
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Jetguy Jetguy is offline
 
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Location: Texas, Fort Worth
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Actually it has been stated by Vans that the nose wheel strut has more drag than you would think! Expect an increase in 3 to 4 knots with the fairing on.
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RV12 N1212K
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  #312  
Old 04-15-2019, 10:47 AM
NORM T NORM T is offline
 
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Location: Dallas, OR
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Jim,perhaps pleased, not shocked, would have been what I should have said. Thanks for sharing your opinion. Perhaps "significant" depends on your point of view. My evaluation was run on pretty much standard days, not same day, about 60 degrees F, 30"hg, AP straight and level, 3000' msl, 2800 agl, pilot only, maybe half tank fuel. Steady state at 5000 RPM: 100kts/no fairings; 105 kts/ wheel fairings, 110 kts/whl and strut fairings. I saw 120 kts at 5300 RPM, scary at 5800! I saw climb rates of 1000 fpm. All values my scanned readings, approximate but indicative, satisfied my purposes. Test by others will be different, I don't care, I like mine, may not be repeatable, evaluation was for my benefit and curiosity. I am not the builder, it was flying before my purchase. I like it! I really like it a lot! (On another thought, why do people have wheel pants on J-3 Cubs?) Have Fun, Jim.
Norm
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  #313  
Old 04-15-2019, 03:01 PM
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Piper J3 Piper J3 is offline
 
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Quote:
Originally Posted by NORM T View Post
On another thought, why do people have wheel pants on J-3 Cubs?
I can speak with a fair amount of authority about J-3's having owned one for 23 years and some 1100 flying hours. The only thing wheel pants do on a Cub is keep mud from flinging onto the bottom of the wing. Makes a real racket when clumps of mud start hitting fabric wing like a big bass drum...
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Hinckley, Ohio (1OA2)
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
RV-12 E-LSA #120058 AWC July 2012 N633CM
RV-12 Bought Flying Oct 2015 with 48TT - Hobbs now 421

LSRM-A Certificate 2016
Special Thanks... EJ Trucks - Crew Chief A-4 Skyhawks
and MJ Stricker (my flight instructor) - 1st Lt./Captain B-17H WWII
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  #314  
Old 04-21-2019, 10:22 AM
NinerBikes NinerBikes is offline
 
Join Date: Dec 2018
Location: Granada Hills
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Quote:
Originally Posted by NORM T View Post
Comparing airspeed and fuel burn vs. engine RPM before installing wheel fairings and then with, and then adding the nose wheel strut fairings, I was shocked by the significant improvement resulting from the latter. It caused me to speculate about the exhaust pipe which is also directly behind the propeller. Could a V-cross section fin behind the pipe could be beneficial in drag reduction, and maybe in reducing exhaust gas stain on the belly? Has anyone done anything in this area? I would like to hear about such work if it has no ill effects. At least it is fun to think about such things!

Norm T
Bought ELSA RV-12 flying, great little airplane!
Had Grumman Cheetah for 20 years prior
Do you have any pictures you could post up on the nose wheel strut fairing?
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  #315  
Old 04-21-2019, 10:51 AM
rongawer rongawer is offline
 
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Location: Brentwood, CA
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Quote:
Originally Posted by NinerBikes View Post
Do you have any pictures you could post up on the nose wheel strut fairing?
I believe he's referring to the one provided in the kit with the wheel pants. See https://www.vansaircraft.com/service...revisions/36a/
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  #316  
Old 04-21-2019, 10:51 AM
DHeal DHeal is offline
 
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Location: Windsor, California
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Quote:
Originally Posted by NinerBikes View Post
Do you have any pictures you could post up on the nose wheel strut fairing?
See: https://www.vansaircraft.com/service...revisions/36a/
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  #317  
Old 04-21-2019, 02:28 PM
NinerBikes NinerBikes is offline
 
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Thanks, guys! 5 kt's is 5 kts.
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  #318  
Old 04-21-2019, 04:33 PM
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Piper J3 Piper J3 is offline
 
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Quote:
Originally Posted by NinerBikes View Post
Thanks, guys! 5 kt's is 5 kts.
5 KPH is a lot almost 5% of cruise speed. I don't think I see that kind of improvement with all three pressure-recovery wheel fairings. RV-12 is not a fast machine that would benefit from a lot of aerodynamic cleanup.

Nose strut is a round tube which is bad for aerodynamic drag. But strut is short ~ 30 and mounted almost 45 deg to normal airflow.
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Jim Stricker
Hinckley, Ohio (1OA2)
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
RV-12 E-LSA #120058 AWC July 2012 N633CM
RV-12 Bought Flying Oct 2015 with 48TT - Hobbs now 421

LSRM-A Certificate 2016
Special Thanks... EJ Trucks - Crew Chief A-4 Skyhawks
and MJ Stricker (my flight instructor) - 1st Lt./Captain B-17H WWII
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  #319  
Old 04-21-2019, 05:49 PM
E. D. Eliot E. D. Eliot is offline
 
Join Date: Dec 2005
Location: San Pedro
Posts: 913
Default Main gear fairings?

I have read of only one person trying to manufacture and mount a set of main landing gear fairings - believe that they use RV-8 lg fairings. Anyone else tried this idea out. Results? I'd expect a few more knots gained. Might reduce drag enough to get 120K at lower engine speed???
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  #320  
Old 04-21-2019, 07:21 PM
NinerBikes NinerBikes is offline
 
Join Date: Dec 2018
Location: Granada Hills
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Quote:
Originally Posted by NORM T View Post
Jim,perhaps pleased, not shocked, would have been what I should have said. Thanks for sharing your opinion. Perhaps "significant" depends on your point of view. My evaluation was run on pretty much standard days, not same day, about 60 degrees F, 30"hg, AP straight and level, 3000' msl, 2800 agl, pilot only, maybe half tank fuel. Steady state at 5000 RPM: 100kts/no fairings; 105 kts/ wheel fairings, 110 kts/whl and strut fairings. I saw 120 kts at 5300 RPM, scary at 5800! I saw climb rates of 1000 fpm. All values my scanned readings, approximate but indicative, satisfied my purposes. Test by others will be different, I don't care, I like mine, may not be repeatable, evaluation was for my benefit and curiosity. I am not the builder, it was flying before my purchase. I like it! I really like it a lot! (On another thought, why do people have wheel pants on J-3 Cubs?) Have Fun, Jim.
Norm
Bolded, for statistical purposes, as real world results, under standard ATM conditions.
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