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disconnectedradical
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 Posted: Jul 24, 2012 - 10:33 PM
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Enthusiast
Joined: Dec 31, 2010 - 12:44 AM
Posts: 84
Status: Offline
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| It seems that the F-22 uses a commercial NACA airfoil for its wings. According to aerospaceweb.org, the F-22 uses NACA 64A?05.92 at the root and NACA 64A?04.29 tip. Why doesn't the F-22 use a custom supercritical design? |
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Sponsor
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 Posted: May 23, 2013 - 6:54 PM
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F-16.net Sponsor
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Roscoe
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Posted: Jul 25, 2012 - 07:10 AM
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Elite 1K
Joined: Jun 29, 2004 - 09:14 PM
Posts: 1279
Location: Las Vegas
Status: Offline
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| Why should they? |
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Roscoe
<b>"It's time to get medieval, I'm goin' in for guns"</b> - <i>Dos Gringos</i>
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disconnectedradical
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Posted: Jul 25, 2012 - 07:14 AM
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Enthusiast
Joined: Dec 31, 2010 - 12:44 AM
Posts: 84
Status: Offline
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Roscoe wrote:
Why should they?
Considering that there are computer programs available that can create a customized wing that maximizes performance, I'm a bit puzzled that the F-22 uses an "off-the-shelf" airfoil. |
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em745
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Posted: Jul 26, 2012 - 12:38 AM
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Active Member
Joined: Oct 18, 2007 - 09:28 AM
Posts: 131
Status: Offline
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disconnectedradical wrote:
I'm a bit puzzled that the F-22 uses an "off-the-shelf" airfoil.
Maybe "supercritical" is less VLO-friendly than NACA?  |
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cola
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Posted: Jul 26, 2012 - 01:46 AM
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Senior member
Joined: May 18, 2009 - 01:52 AM
Posts: 373
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em745,
how did you figure, the F22 doesn't have a supercritical wing? |
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Cheers, Cola
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tacf-x
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Posted: Jul 26, 2012 - 06:28 AM
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Senior member
Joined: Sep 17, 2011 - 03:25 AM
Posts: 431
Location: Champaign, Illinois
Status: Offline
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cola wrote:
em745,
how did you figure, the F22 doesn't have a supercritical wing?
The F-22's airfoil as cited by aerospaceweb.org has been shown to be a very thin symmetric airfoil with a relatively sharp leading edge. It doesn't appear to be supercritical. I can't quite find an image but I seem to remember one website actually plotting the F-22's airfoils at some point. |
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f22spec
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Posted: Jul 26, 2012 - 10:08 AM
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Newbie
Joined: Mar 25, 2012 - 10:52 PM
Posts: 19
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| While I can't confirm whether the airfoil on the F-22 is "off the shelf" or not, I will say this. If the "off the shelf" version works sufficiently for the needs of the F-22, it's going to be used instead of a customized version purely for production cost purposes. Everything that is customized always costs more than a generic "off the shelf" version. |
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popcorn
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Posted: Jul 26, 2012 - 02:18 PM
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Elite 2K
Joined: Sep 24, 2008 - 09:55 AM
Posts: 2037
Status: Offline
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| The Raptor outclasses everything else flying so I guess they chose the airfoil. |
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cola
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Posted: Jul 26, 2012 - 02:28 PM
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Senior member
Joined: May 18, 2009 - 01:52 AM
Posts: 373
Status: Offline
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tacf-x wrote:
The F-22's airfoil as cited by aerospaceweb.org has been shown to be a very thin symmetric airfoil with a relatively sharp leading edge. It doesn't appear to be supercritical.
How do you figure it's symmetrical, in the first place?
I thought "?" stands for undisclosed, not "0". |
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Cheers, Cola
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tacf-x
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Posted: Jul 27, 2012 - 03:02 AM
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Senior member
Joined: Sep 17, 2011 - 03:25 AM
Posts: 431
Location: Champaign, Illinois
Status: Offline
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cola wrote:
tacf-x wrote:
The F-22's airfoil as cited by aerospaceweb.org has been shown to be a very thin symmetric airfoil with a relatively sharp leading edge. It doesn't appear to be supercritical.
How do you figure it's symmetrical, in the first place?
I thought "?" stands for undisclosed, not "0".
http://www.pdas.com/naca456samples.html
This site says it's "0" not "?" though. |
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cola
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Posted: Jul 27, 2012 - 08:53 AM
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Senior member
Joined: May 18, 2009 - 01:52 AM
Posts: 373
Status: Offline
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Good find...thx. 
Still, an a=0.8 suggests it's a supercritical profile, by any account. |
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Cheers, Cola
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