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  #121  
Old 03-28-2012, 08:12 AM
gereed75 gereed75 is offline
 
Join Date: Sep 2007
Location: pittsburgh pa
Posts: 554
Default

Dan, Lot's of data points here with results that I will call disparate for now. I will drop you an e-mail to discuss further. Don't be discouraged, if nothing else, we're learning and you have an excuse to fly more.

Looking forward to Bob's and other's results. Latter
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RV-6 IO-360
WW 200 RV now an Al Hartzell for improved CG
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  #122  
Old 03-28-2012, 08:33 AM
Bob Axsom Bob Axsom is offline
 
Join Date: Mar 2005
Posts: 5,685
Default Slow going

Just got home from the airport. Spent the last 9.5 hours there and only got one flow fence made and installed. I need a little sleep and cleanupthen head back to do the left flow fence. They are all rectangles, trhe center is 4"x24" and sides are 3"x22" (approximately).

Bob Axsom
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  #123  
Old 03-28-2012, 10:24 PM
Bob Axsom Bob Axsom is offline
 
Join Date: Mar 2005
Posts: 5,685
Default Built the left flow fence



This photo shows the right flow fence and the center separator fin. I finished building the left flow fence today (yes building - you wouldn't believe the tedious details) but I have not installed it yet. I should get it done late tonight.

Bob Axsom

Last edited by Bob Axsom : 03-28-2012 at 10:37 PM. Reason: added photo and text
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  #124  
Old 03-29-2012, 06:44 AM
Bob Axsom Bob Axsom is offline
 
Join Date: Mar 2005
Posts: 5,685
Default I finished the left fence

I finished the left flow fence installation at 06:18. The sun isn't up yet and the plane is in semi race configuration without lights so I can't test it yet. I'm sleepy but the sky is lighting up a little I guess I'll hang around for a few more minutes and do the test.

Bob Axsom
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  #125  
Old 03-29-2012, 09:15 AM
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hydroguy2 hydroguy2 is offline
 
Join Date: Sep 2006
Location: Townsend, Montana
Posts: 3,179
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got my fingers crossed for you....and patiently waiting the results
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  #126  
Old 03-29-2012, 09:18 AM
Bob Axsom Bob Axsom is offline
 
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Posts: 5,685
Default Test complete - OK




The speed was 184.3 kts or 1/2kt faster than the test with the center separator alone. I think this is a keeper. The sound is pretty awesome as well.

Bob Axsom

P.S. for Ron Lee no effect on temps.

BA

Last edited by Bob Axsom : 03-29-2012 at 09:26 AM. Reason: added p.s.
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  #127  
Old 03-29-2012, 09:37 AM
gereed75 gereed75 is offline
 
Join Date: Sep 2007
Location: pittsburgh pa
Posts: 554
Default yeow Bob

Definitely getting my vote for Perseverence of the Year award!! This quote coming from you was what I wanted to hear;

Quote:
Originally Posted by Bob Axsom View Post
; I think this is a keeper.
I know that you have some further ideas and some work to go that I think will yield more substantial results. But good enough for now and best of luck this weekend.

PS...Those puppies are not going anywhere!! I have less screws holding on my whole fairing than on one of your strakes !!
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RV-6 IO-360
WW 200 RV now an Al Hartzell for improved CG

Last edited by gereed75 : 03-29-2012 at 09:43 AM.
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  #128  
Old 03-29-2012, 10:02 AM
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hydroguy2 hydroguy2 is offline
 
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Location: Townsend, Montana
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good job, Bob. Now go get rested up for the Texoma race.

Is there any concern about flexing or distortion of the fences at speed? or are they pretty stiff?

I was buttoning up my temporary mods yesterday, going to test fly once the evening calm arrived. BUT got called to work unexpectedly. Hope to get out there this afternoon(leaving work early) to finish and maybe fly.
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  #129  
Old 03-29-2012, 10:35 AM
David Paule David Paule is offline
 
Join Date: Dec 2009
Location: Boulder, CO
Posts: 5,077
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Bob,

Later, when you've got some time, it might be productive to extend the cowl bottom surface aft to cover some of these new strakes and make the exit duct longer.

If you do it, perhaps you could make its length adjustable.

Dave
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  #130  
Old 03-29-2012, 01:05 PM
Bob Axsom Bob Axsom is offline
 
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Posts: 5,685
Default That is the plan

Quote:
Originally Posted by David Paule View Post
Bob,

Later, when you've got some time, it might be productive to extend the cowl bottom surface aft to cover some of these new strakes and make the exit duct longer.

If you do it, perhaps you could make its length adjustable.

Dave
Dave - I wanted to approach this incrementally so that I would gain some first hand knowledge about the effects of the parts. So far I have the effect of a long semi-central rectangular separator/fin and that with two similar flow fences all of which are now replaceable with screws. At some point I will put a bottom on it and try various lengths and shapes - I think you can see this has essentially an infinite number of combinations that can be tested. I already have bought the "0" condition Aluminum sheet to make the bottom closure plate out of.

Brian - all three of the major test components are made of 0.090" (~3/32") thick 2024 T3 aluminum mounted on 1/16"x3/4"x3/4"x20+" 6061 aluminum angle. It is very substantial and that is another parameter I can work with.

Bob Axsom

I'm going back to bed...

Last edited by Bob Axsom : 03-29-2012 at 06:01 PM.
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