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Author
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Topic: Airfoils
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Spanky the Mad Dog
Pilot
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posted 03-18- 06:22 AM
   
Spanky here... Hi guys. I'm wondering about airfoils. I was wondering which one to use for the p40 What i'm wondering is what do the NACA #s mean? If i use one that has #s that are really close to the P40s #s will that be decent? Check this out. Curtiss P-40 Warhawk NACA 2215 NACA 2209
Supermarine 300 Spitfire I NACA 2213 NACA 2209.4 If those #s mean anything then i would say the airfoil is pretty similar. I know the wing itself was much different but I'm just talking the airfoil. Also where do i tell my plane which airfoil to use? Can i do it in OPS or is it in the asc file?
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jedi
Pilot
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posted 03-18- 10:15 AM
Click on the wing, or wingtip in OPS. Select the properties tab. You'll see a line that says airSection "P51foil" or "Typhfoil" or similar. Double-click that line, and it will allow you to edit it. The different airfoils are listed in the startup.ppf file, but the syntax you need to use is as above.For example, it will list an airfoil "P51D.sm" in the startup.ppf file, but the line in the properties for that is "P51foil". I believe the property description must match the folder name of the plane, i.e. the airfoil for the Typhoon is "Typhfoil". As for the numbering of the NACA airfoils, I'd be fairly confident that 2209.4 is pretty close to 2209, but not so confident that 2215 is necessarily close to 2213. What you might be able to do is find a site that has pictures of the airfoils. Then pick the one in the game that looks closest. ------------------
--jedi-- IP: Logged |
Tailslide
Pilot
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posted 03-18- 10:25 AM
The airfoil is just the outline of the wing if you cut a slice out of it. The NACA numbers are a code to represent this shape. If you look in the biblio forum there are free programs that will draw the shape from the naca number. There's even a plugin for max that will create a 3d wing from the NACA number (this is how I got the right shape for the 3d object of the wing and tail sections of my yak). TS IP: Logged |
Falck
Pilot
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posted 03-18- 10:32 AM
NACA was the aerodynamics agency that preceded NASA.
http://cosmos.kriss.re.kr/flowmeasurement/naca/naca.html That page has everything you want to know
The last two numbers are the foils crossectional height as a percentage of the chord. So yes I would assume that 2215 is close to 2213, but it may not be close enough. You may want to have a look at this too http://www.ctaz.com/~kelcomp/airfoils5.htm IP: Logged |
Spanky the Mad Dog
Pilot
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posted 03-18- 03:10 PM
Spanky here... Hi guys thanks for the info and tips. I guess your right that 2213 might not be really close to 2215 but. I bet its alot closer then just picking a wing that i THINK is similar. i'm going to go with it unless anyone can see any problems.
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Spanky the Mad Dog
Pilot
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posted 03-18- 03:51 PM
spanky here... hmm just tried that software and 2213 and 2215 are decently close but 2209 and 2209.4 are crazy CRAZY different. So wacky. K heres one for you guys. WE are just using the same airfoil. I guess the root one for the whole wing. That can't possibly be right guys. We should have to state the root and tip. When are we going to fix that? I guess after SOS? if ever? IP: Logged |
Tailslide
Pilot
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posted 03-18- 03:57 PM
Easy enough spanky.. just give the root and tip different airfoils when you make the plane. TS
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Falck
Pilot
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posted 03-18- 04:00 PM
The wing has pretty much the same cross-section throughout, cept for the very end.
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Spanky the Mad Dog
Pilot
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posted 03-19- 07:24 AM
Spanky here..
What do you mean tail? The only airfoils i have to work with are the ones all ready in game right?
Falck the spit cross section changes quite a bit.
If you ask me the way the game looks at it right now. The whole wing is using the root at the same size the whole way. But i haven't really gotten too far into the whole airfoil with openplane thing yet.
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