Just to make sure we are talking about the same Naish Co manufacturer
www.naishfoils.com/First glance engineering notes:
1. First engineering error. Aluminum mast will corrode in sea water within a year even if used only ones. Using stainless steel screws will result in galvanic corrosion due to high difference in electrochemical potential of aluminum and SS Alloy (High Nickel content). In other words. If you get salt on the Al/SS joint you will need to take it on parts, wash it and keep it in dry place. The bolt joints will corrode even in fresh water or high humidity environment - common for where we windsurf. Naish Co suggests to wash it after every use. Washing will not help much. But if you complain Naish Co can excuse itself by telling that you did not wash it good enough.
2. Naish Co promotes the mast material as aerospace grade 6061 aluminum. Wrong. Aerospace is not using 6061. 2024 is common in aerospace. 6061 is good when you need welding joints. 6061 is the lower cost Al Alloy. The extruded profile for the mast is actually very low cost extrusion used in architecture for decorative options on buildings. This is why you can get it for some $10 per foot.
3. The wings are painted black but actually made out of fiberglass. I assume they use the least expensive E-glass with polyester matrix, which is not water prove. This is why the material needs painting. Such of material cost about $3 per pound. I think selection of dominant black in painting is for making it look like carbon.
4. Just an assumption based on apparent low cost design. The holes for the bolts are drilled, not laminated. Drilling cuts fibers resulting in reduction of the structural integrity. Other disadvantage is that drilling exposes fibers to sea water. They paint exterior but they cannot paint the holes. In correct engineering world the non-corrosive barrier needs to be installed between on the interior of the holes. Titanium inserts is a common aerospace solution.
5. The perimeter of the wing is shaped for artistic look, not for performance. They probably experimented with different shapes and picked the one that sales the most. Somehow these experienced foilers think that the wing has to look like a bird wing, regardless of hydrodynamic performance. promoted winglets bent down sounds childish from hydrodynamic prospective. It looks smooth, but simple end plates would perform much better, (but may not look like a bird.) Look it up on the Internet how people designed airplanes in 17th century - all them look like birds but did not fly well. Compare to the modern airplanes that can fly after engineers took it over from the dreamers.
6. All the mechanical connections is "Fail" on structural engineering exam. This is about all the foil designs, and Naish Co just copied.
7. The safety warning on Naish Co adds to 1 through 6 above and actually suggests you do not use these foils.
Because of this I think that promoting Naish and Co on this forum is ok. Just do not tell me that Naich and Co knows how to engineer.
Thank you for the prompt reply. I think I really touched you with critics of Naish and Co. Are you in one team?
My point here is going to school at cost of surfing pays back.