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Author
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Topic: Airfoil help
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Nat
Pilot
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posted 01-25- 01:01 AM
   
Hey Guys, well the airfoils I'm trying to make work for the La5 just aren't, I got the top speed at altitude spot on, and spot on at 1,000ft aswell, but now it can't take off even though it flys great, so I've been sat here looking at Wing Extractor, and reading the old topics about it, and I'm still baffled... Is there anyone out there that could produce me an airfoil for the La5-FN with a numb nuts guide to editing foils?Thanks Guys ~Nat~ ------------------
7./JG3 "Naturlich"
"SDOE... What and where would you like to fly today?"
http://members.nbci.com/naturlich/index.htm </B> IP: Logged |
Tailslide
Pilot
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posted 01-25- 02:44 AM
IMHO we do not have proper software to generate airfoil data and you are better off taking the closest existing SDOE airfoil to the airfoil on your plane. TS IP: Logged |
Bishop
Pilot
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posted 01-25- 03:15 AM
TS:What is your opinion on http://beadec1.ea.bs.dlr.de/Airfoils/calcfoil.htm ? It is possible to take the airfoil coordinates from the UIUC database... play with them a little using "aerofoil" to get the point distribution tighter at the leading and trailing edge and then use the calcfoil to get airfoil data. You can then use Excel to "blend" the results with an existing airfoil to get the post-stall stuff. buuut... the question I ask is:
How accurate are the methods used by the "calcfoil" site? I ask because I have a feeling that the beaufighter airfoil might have ended up with a very high stall angle of attack... which will have to be fixed... IP: Logged |
Tailslide
Pilot
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posted 01-25- 03:29 AM
Bishop, yes I was thinking the same thing.. none of the free stuff I have tried handles post-departure but you should be able to at least find out things like the maximum lift and stall points then use that to tweak the closest existing SDOE airfoil. A good first step would be to try to replicate the values in the default SDOE airfoils using one of these programs to make sure you have the same Reynolds numbers, etc. I've found picking the closest airfoil in SDOE and setting the plane weights, center of gravity, wing areas, fuel tanks, aspect ratios, control surface deflections etc etc works well. Two similarly shaped airfoils don't seem to cause much handling changes compared to the other things I mentioned. If you are modelling some plane with a really out of the norm wing shape it would be worthwhile though. TS IP: Logged |
Nat
Pilot
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posted 01-25- 04:34 AM
rgr that Tail, you're the man when it comes to foild so I'll go through and try and find which might be a better match, right now though it's being a bitch, SDOE doesn't handle very light aircraft with massivly powerful engines though, I think next may be the spit foil to try.Thanks Tail ~Nat~ IP: Logged | |
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