NACA 25112 Mod

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undean

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Joined
Jun 30, 2019
Messages
9
I've come up with what appears to me to be a very well mannered airfoil shape. At least on paper. It is a modification of a 25112. Attached are a few pictures of outputs from XFLR5.

In my ultralight design I was looking at utilizing low moment airfoil(s) for the wings along with carbon skins. Originally I was looking at a 23012 but recall reading that it is fairly sensitive to its dimensions and as such dirt/grime or a minimally out of spec part could severely impact performance. I looked at quite a few other airfoils including 25112 and 43012A.

I like this mod (25113-21) as it appears it would be relatively insensitive to being clean or dirty, has excellent low Reynolds number performance for its very benign pitching moment, a nice and stable center of pressure, and "good enough" other characteristics.

As it has been some time since my Aero coursework please disabuse me of any these notions if they are questionable or suggest another airfoil that may be "better".

It is my first time inserting pictures so hopefully it will go smoothly...

Edit1: The pictures do not blow up as large as I had hoped. I'll post a few different ones shortly.
Edit2: New pictures

Airfoils-Key.PNG
Airfoils-Snip-foils.PNG
Airfoils-Cl-Alpha.PNG
Airfoils-Cm-Alpha.PNG
Airfoils-Cl-Cd-Alpha.PNG
Airfoils-Cl-Cd.PNG
Airfoils-Xnp-Alpha.PNG
 
Last edited:

BJC

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Oct 7, 2013
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11,248
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Originally I was looking at a 23012 but recall reading that it is fairly sensitive to its dimensions and as such dirt/grime or a minimally out of spec part could severely impact performance.
Lots has been written about the “unfavorable characteristics” of the widely used 23012, usually by people who never have flown one.

Even my friend’s old, dirty, beat-up Taylorcraft flew nicely.


BJC
 

plncraze

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May 11, 2006
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1,824
Jim Marske has used mods of some 5 digit series airfoil for some of the same reasons you are. Airfoil Tools.com has some of those under Marske's name. That will let you compare xfoil's results to something being used on a flying airplane. I'm thinking of the Marske Monarch.
 
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