HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old May 13, 2008, 08:47 AM
Registered User
The Far East
Joined Jan 2006
853 Posts
Help!
Goettingen 580 airfoil coordinate

I need it to design a wing for my current scale sailplane project. Coordinates for this particular airfoil was not in UIUC database, Compufoil, or in any of books I have. Would appreciate any info. TIA.
suirendoujin is offline Find More Posts by suirendoujin
Reply With Quote
Sign up now
to remove ads between posts
Old May 13, 2008, 10:26 AM
Registered User
Florida
Joined Jul 2004
829 Posts
suirendoujin, I could not even locate this airfoil in Profili 2.18. Google did not show up anything obvious, looks like this one will be tough. Joser
Thermaleer is offline Find More Posts by Thermaleer
Reply With Quote
Old May 13, 2008, 06:18 PM
Registered User
The Far East
Joined Jan 2006
853 Posts
Thermaleer, Yes, this one IS tough. Goettingen airfoil numbers are numbers given in sequence to an airfoil design, so you have to get hold of the actual coordinates or an accurate drawing. I am hoping European modeler can help me out.
suirendoujin is offline Find More Posts by suirendoujin
Reply With Quote
Old May 13, 2008, 11:46 PM
Registered User
Florida
Joined Jul 2004
829 Posts
What aircraft was it used on? Maybe it can be lofted from a set of drawings?
Thermaleer is offline Find More Posts by Thermaleer
Reply With Quote
Old May 14, 2008, 08:45 AM
Registered User
The Far East
Joined Jan 2006
853 Posts
This airfoil was used on Kyutei Type 5. A vintage sailplane with historic significance here in Japan. Made the first over an hour flight, auto-tow and aero tow. My build thread is here, http://www.rcgroups.com/forums/showthread.php?t=815703
There is a drawing of the airfoil in one of the 3 views I have. Unfortunately, its only 37 mm in chord, so in order to use it I must blow it up ten times. So much with accuracey. Goettingen 580 does look vaguely? similar to thickened Eppler 214. So, I f I cannot obtain coordinates, then will have to take an alternative approach.
suirendoujin is offline Find More Posts by suirendoujin
Reply With Quote
Old May 14, 2008, 10:32 AM
Suspended Account
Joined Mar 2007
498 Posts
Assuming that's the fullsize gliders foil...
From what I've read scale foils don't always fair well at modelling sizes.Have you considered using something similar but designed for our reynolds numbers spread ??
HTH
Ghost
ghostofpf1 is offline Find More Posts by ghostofpf1
Reply With Quote
Old May 14, 2008, 10:45 AM
Registered User
Salt Lake City, Utah
Joined Nov 2004
820 Posts
You may want to consider a thick high camber HQ airfoil.
Lance Prior is offline Find More Posts by Lance Prior
Reply With Quote
Old May 14, 2008, 03:05 PM
dare to thermal
Mannheim, Germany
Joined May 2004
572 Posts
Or may be a sd7062 (thinned to 12%). IMO itīs not necessary to add more drag by using too thick airfoils. The Re-numbers will be at least 150k or 200k.

Bernd
Bernd Brunner is offline Find More Posts by Bernd Brunner
Reply With Quote
Old May 14, 2008, 03:42 PM
Registered User
Salt Lake City, Utah
Joined Nov 2004
820 Posts
I suggested thick purely for scale appearance.

Looking at the drawing the foil appears to be about 15% thick or more.
Lance Prior is offline Find More Posts by Lance Prior
Reply With Quote
Old May 14, 2008, 05:18 PM
Registered User
United States, MA, Waltham
Joined Dec 2001
6,938 Posts
Is the University still there? That's where the airfoil came from, isn't it? If so, perhaps if you can find a German speaker you can find it and they'll just give you the coordinates. A lot of trouble, I suppose. Perhaps they even have all those coordinates on a web site?
lincoln is offline Find More Posts by lincoln
RCG Plus Member
Latest blog entry: paper blast tube test
Reply With Quote
Old May 14, 2008, 06:16 PM
Registered User
The Far East
Joined Jan 2006
853 Posts
Thank you all for your input. Goettingen 580 was used on full scale. At quarer scale, I thought, well, was hoping, to get away with it, biased more to scale appearance than performance.
suirendoujin is offline Find More Posts by suirendoujin
Reply With Quote
Old May 14, 2008, 09:40 PM
Jim C Patrick
jcpatrick's Avatar
Shenandoah County
Joined Jan 2008
839 Posts
suirendoujin - What happened to Hiroshi Takeuchi's NASG Airfoil Database? There were a lot of Gottingen airfoils there, and now the site is gone.

Here is a comparison of the airfoil you posted, the SD7062 Bernd suggested, and a Drela airfoil designed for hand launch gliders. You might want to try this one. If you find the 580 coordinates or data, I'm sure someone will help you make some airfoil drawings.
jcpatrick is offline Find More Posts by jcpatrick
Reply With Quote
Old May 15, 2008, 09:25 AM
Registered User
The Far East
Joined Jan 2006
853 Posts
Well, based on the rather simple, if not crude airfoil shape provided with the 3 views I have, it looks like Goe 580 had a 13.5 % thick airfoil. If I can modify the coordinates of AG27-13% by thinning it to say, 12 % and giving it Philips entry, I might have an airfoil which might be a nice compromise between scale looks and performance. Thank you jcpatrick. I will probably reach a verdict? on Monday.
suirendoujin is offline Find More Posts by suirendoujin
Reply With Quote
Old May 15, 2008, 12:04 PM
Registered User
Salt Lake City, Utah
Joined Nov 2004
820 Posts
Are you talking about taking an AG27 and making it 13% thick?

You would probably be better off to use an airfoil that is designed to be the thickness you require instead of making a thin one thick.
Lance Prior is offline Find More Posts by Lance Prior
Reply With Quote
Old May 15, 2008, 01:52 PM
dare to thermal
Mannheim, Germany
Joined May 2004
572 Posts
suirendoujin, what do you mean with "scale appearance"? Wouldnīt you fly the model, is it static? May be you can ask Loopingfred about the airfoil he has used on his KA-3 (2.5m; scale 1:4). By the way, i have looked at the polars befor i recommended the modified SD7062.

Cheers,
Bernd
Bernd Brunner is offline Find More Posts by Bernd Brunner
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion airfoil coordinate extraction Pheasant The Builders Workshop 5 Feb 05, 2006 10:02 AM