ASW15 airfoils

[Michael Huber]

Hi,

I am looking for airfoil data for the ASW15 wing to machine leading edge templates . I know that the FX 61-163 is used at the root and the FX60-126 at the tip, but how is the transition between the two airfoils? I would guess that the FX 61-163 is used in the inner wing panel and a transition to the FX 60-126 is made in the outer wing panel.

Does anybody have a drawing or some other kind of information that´s more than just a guess?

Thank you
Michael

[DirkW]

Hi Michael,
FX61-163 at root and FX60-126 at tip is correct; mid section I´m not sure.
I would measure chord and thickness at the kink to calculate thickness. If 16.3% then the transition is in the outer panel only.
Same question actually applies to the twist (-2° total at tip). I would turn one wing panel upside down and use a laser balance to measure the vertical distance between trailing edge and the highest point of the profil at root, kink and tip. 
Once that´s all figured out you can use any CAD program to position the defining airfoils, sheet them and then cut the templates.
I attach the coordinates from the Stuttgarter Profilkatalog.
Hope that helps.
Dirk

[Michael Huber]

Hi Dirk,

thank you for your reply. I assumed FX61-163 for the inner wing panel and FX61-163 to FX60-126 for the outer wing panel as written above and made the leading edge templates and they seem to fit quite well. The only real difference is that the leading edge radius at the wingtip is larger than it should be according to the templates. This might be from an older refinishing job, or might even be so in factory condition, I don´t know and have no other 15 at hand to compare.

Michael 

[DirkW]

Stall becomes softer as nose radius increases while performance isn´t compromised too much, so it might be intentionally. If you want you can send the tip template across as a 1:1 pdf or so; I can then check on my wing.

[Michael Huber]

Here is the PDF with the nose templates. The assumptions made for the wing profiles are in this thread and on the last page of the PDF. Airfoil coordinates are from the database included in Profili2. Note that there is some waviness visible at high magnification in the outer templates, this is probably from the FX60-126 coordinates. I doubt that there is any noticeable effect considering the template in a 1:1 scale and typical accuracy in wing sanding.

Please do not distribute these templates anywhere else, so everybody who might download and use the file knows the assumptions made, and errors can be reported (and maybe corrected) here. The file is provided as is for private use, I hope it may be helpful, but I assume no liability for it.

Michael