Wingsail design
Posted: 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 http://digitool.library.mcgill.ca/R/?fu ... EN01-MCG02; also http://ayrs.org/files/Analysis%20and%20 ... 20sail.pdf
[2] See http://www.iag.uni-stuttgart.de/IAG/ins ... fcat2.html
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 http://digitool.library.mcgill.ca/R/?fu ... EN01-MCG02; also http://ayrs.org/files/Analysis%20and%20 ... 20sail.pdf
[2] See http://www.iag.uni-stuttgart.de/IAG/ins ... fcat2.html