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  #1  
Old 05-30-2020, 06:38 AM
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1001001 1001001 is offline
 
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Default RV Airfoil Cross Sections?

Does anyone have dimensioned drawings of the various RV models' airfoil cross sections? Don't worry, I'm not going to get in the business of copying wing parts, I just have an idea (probably a bad one) and need some dimensions to confirm. The ones of most interest to me are -10, -14, -9, -7.
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  #2  
Old 05-30-2020, 06:52 AM
BillL BillL is offline
 
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Quote:
Originally Posted by 1001001 View Post
Does anyone have dimensioned drawings of the various RV models' airfoil cross sections? Don't worry, I'm not going to get in the business of copying wing parts, I just have an idea (probably a bad one) and need some dimensions to confirm. The ones of most interest to me are -10, -14, -9, -7.
Steve Smith scsmith here on VAF did the design for the 10 airfoil.

You can search some more and find the numbers.

http://www.vansairforce.com/communit...5&postcount=14

http://www.vansairforce.com/communit...ad.php?t=37807

http://www.vansairforce.com/communit...ad.php?t=54192
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“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”

Last edited by BillL : 05-30-2020 at 06:58 AM.
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  #3  
Old 05-30-2020, 07:33 AM
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1001001 1001001 is offline
 
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Quote:
Originally Posted by BillL View Post
Steve Smith scsmith here on VAF did the design for the 10 airfoil.

You can search some more and find the numbers.

http://www.vansairforce.com/communit...5&postcount=14

http://www.vansairforce.com/communit...ad.php?t=37807

http://www.vansairforce.com/communit...ad.php?t=54192
Thanks! I had seen those threads and references before. Just looking for the actual dimensions, for instance chord, as the airfoils can be scaled up or down. I have some -10 wings I can measure a few feet away, so really just need them for the other models. Sorry I was unclear.
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  #4  
Old 05-30-2020, 07:58 AM
Ralph Inkster Ralph Inkster is offline
 
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Don?t know about the 3, but I think the 4,6,7&8 are Same airfoil. Search the web for Naca 23013.5, there is a number of sources that will list the airfoil coordinates.
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  #5  
Old 05-30-2020, 08:52 AM
terrye terrye is offline
 
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Location: Vancouver, BC, Canada
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Default RV Airfoil Cross Sections?

The RV-9(A) uses a unique John Roncz airfoil I think named RV-6T (if memory serves) I've never seen the coordinates and I think only Vans and John Roncz have them. The airfoil is one of the reasons I bought the RV-9A kit. You can buy a single nose and main rib from Vans, this will get you close.
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  #6  
Old 06-04-2020, 10:35 AM
PhatRV PhatRV is offline
 
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Quote:
Originally Posted by 1001001 View Post
Thanks! I had seen those threads and references before. Just looking for the actual dimensions, for instance chord, as the airfoils can be scaled up or down. I have some -10 wings I can measure a few feet away, so really just need them for the other models. Sorry I was unclear.
You can scale up the coordinate to the chord length you want. The chord in the coordinate file is 1 unit of chord length so if you are building something like 24 inches of chord, just multiply everything 24 then you are done.
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  #7  
Old 06-04-2020, 10:45 AM
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Originally Posted by PhatRV View Post
You can scale up the coordinate to the chord length you want. The chord in the coordinate file is 1 unit of chord length so if you are building something like 24 inches of chord, just multiply everything 24 then you are done.
Yep. I just don't know the chord dimensions for the other RVs.
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  #8  
Old 06-04-2020, 12:34 PM
Ralph Inkster Ralph Inkster is offline
 
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RV-4-6-7-8 (wingtips interchangeable) W415 measured 58"

per brochure specs for above models, wing area / wing span suggests cord about 57.4" to 57.9", I assume brochure numbers are rounded due to wingtip shape etc.

old printed RV-6 plans have rib dimensional cord to rear spar at 43.93" +.040 rear spar + flap hinge flanges of about 1.5" + flap rib cord 10" + rear flap skin radius & thickness .025 + leading edge skin .032 = ????..
Sorry. did not see a overall cord dimensional length.

Take your pick
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  #9  
Old 06-04-2020, 02:32 PM
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1001001 1001001 is offline
 
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Quote:
Originally Posted by Ralph Inkster View Post
RV-4-6-7-8 (wingtips interchangeable) W415 measured 58"

per brochure specs for above models, wing area / wing span suggests cord about 57.4" to 57.9", I assume brochure numbers are rounded due to wingtip shape etc.

old printed RV-6 plans have rib dimensional cord to rear spar at 43.93" +.040 rear spar + flap hinge flanges of about 1.5" + flap rib cord 10" + rear flap skin radius & thickness .025 + leading edge skin .032 = …………..
Sorry. did not see a overall cord dimensional length.

Take your pick
Thanks! It's a great start, probably good enough for what I need to do.
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  #10  
Old 06-04-2020, 09:59 PM
scsmith scsmith is offline
 
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I'm pretty sure the RV-14 uses the same ribs as the RV-10. So if you can measure the chord length on a -10, the 14 will be the same. If you want coordinates, I can supply them.

Likewise the RV-4,6,7,8 all use the same chord length. The RV-3 uses the same airfoil, but a different chord length.

The RV-9 is indeed a Roncz airfoil. I have the coordinates for it, but I am not sure I am at liberty to share them. Best ask Van.
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