Wingsail design

Sails soft & hard (wingsails), kites, and discussions of aerodynamic theory
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Wingsail design

Postby admin » Fri Jan 06, 2017 11:25 am

Thinking about wingsails; anyone considering their design should read Fekete and Newman's paper “Analysis and development of a sailboat with self-trimming wing sail”[1] in particular the second order differential equation which allows prediction of its stability. NACA sections are probably not the best for this application. They are aircraft sections and perform poorly at low Reynolds Numbers. A better choice would be Wortmann FX LV-152 K25, or FX 71-L-150/25. However both of these have a flap, which would mean an extra control. The data for these is in Stuttgarter Profilkatalog 1 by Althaus and Wortmann [2]. The symmetrical Eppler sections numbers E474 and E475.
I have started work on articles on reinforcements and sandwich structures, and I think I should write ones on wingsails and hydrofoils. I will send you copies as soon as I can.
Yours sincerely,

Graeme Vanner.

[1] Available at; also
[2] See

Posts: 1
Joined: Sat Jan 07, 2017 1:54 am

Re: Wingsail design

Postby Sailwing » Sat Jan 07, 2017 2:26 am

I have read the article suggested and it clearly confirms almost exactly the work I have been doing recently on this.
I did not have access to this ground-breaking report when I started. But I came to similar conclusions independently.
I have fitted my experimental wingsails to both catamaran and monohulls. They work fine and clearly make the process
of sailing simpler and more user friendly - see
For those interested, recent iterations of the idea can be seen here: ... wer-system
Or - clearly, the idea is catching on at last!

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