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05-30-2020, 06:38 AM
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Join Date: Dec 2014
Location: Just Minutes from KBVI!
Posts: 1,039
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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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05-30-2020, 06:52 AM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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Quote:
Originally Posted by 1001001
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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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
__________________
Bill
RV-7
Lord Kelvin:
“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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05-30-2020, 07:33 AM
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Join Date: Dec 2014
Location: Just Minutes from KBVI!
Posts: 1,039
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Quote:
Originally Posted by BillL
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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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05-30-2020, 07:58 AM
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Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 1,005
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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.
__________________
Ralph
built a few RVs, rebuilt a few more, hot rodded some, & maintained/updated a bunch more
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05-30-2020, 08:52 AM
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Join Date: Feb 2010
Location: Vancouver, BC, Canada
Posts: 860
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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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Terry Edwards
RV-9A (Fuselage)
2020/2021 VAF Contribution Sent
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06-04-2020, 10:35 AM
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Join Date: Mar 2018
Location: Buena Park, California
Posts: 279
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Quote:
Originally Posted by 1001001
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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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.
__________________
RV8 standard build: Empennage 99% completed
Wing -- Closed
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Firewall Forward -- New engine received !
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Donation paid through 2020
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06-04-2020, 10:45 AM
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Join Date: Dec 2014
Location: Just Minutes from KBVI!
Posts: 1,039
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Quote:
Originally Posted by PhatRV
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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Yep. I just don't know the chord dimensions for the other RVs.
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06-04-2020, 12:34 PM
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Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 1,005
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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
__________________
Ralph
built a few RVs, rebuilt a few more, hot rodded some, & maintained/updated a bunch more
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06-04-2020, 02:32 PM
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Join Date: Dec 2014
Location: Just Minutes from KBVI!
Posts: 1,039
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Quote:
Originally Posted by Ralph Inkster
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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Thanks! It's a great start, probably good enough for what I need to do.
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06-04-2020, 09:59 PM
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Join Date: Jan 2008
Location: Ashland, OR
Posts: 2,574
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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.
__________________
Steve Smith
Aeronautical Engineer
RV-8 N825RV
IO-360 A1A
WW 200RV
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Hobbs 625
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bought my old LS6-A back!! 
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