Anarchist pa fish and boat Members 494 posts Location: Mt USA Interests: Build and sail fast stuff-

Anarchist Members 494 posts Location: Mt USA Interests: Build and sail fast stuff- Dirtboats iceboats catamarans windsurfers Catch waves fish and snowboard Perceived truth of most adrenaline junkies - "The older I am the faster I went".
A fellow wing enthusiast friend of mine had mentioned an old paper about Miss Nylex. One of the topics in the article talked about main wing section thickness. It sounds like they tested a 12% thick main but found a thicker section worked better for lower Reynolds numbers. Has anyone seen this paper or shed light on proper main wing section thickness. Back to top
I'm not sure about this paper but I'm sure some of the c-class experts can comment on current wing design and section thickness. A lot has advanced since then, namely CFD has been developed such that it is accessible to the average person and their desktop computer. Wind tunnel is very useful but also subject to errors especially at low reynolds numbers were tunnel flow quality becomes more important. In general pa fish and boat thicker sections may result in flow that stays attached longer but trailing edge thickness and overall leading edge airfoil shape are far more important. Back to top
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us772
Anarchist Members 494 posts Location: Mt USA Interests: Build and sail fast stuff- Dirtboats iceboats catamarans windsurfers Catch waves fish and snowboard pa fish and boat Perceived truth of most adrenaline junkies - "The older I am the faster pa fish and boat I went".
Anarchist pa fish and boat Members 494 posts Location: Mt USA Interests: Build and sail fast stuff- Dirtboats iceboats catamarans windsurfers Catch waves fish and snowboard Perceived truth of most adrenaline junkies - "The older I am the faster I went".
I did some wind tunnel testing a while back. I made the wind tunnel myself so it's not perfect but fun to test and compare things with. I also found while testing different sections at low speeds that thicker main wing sections performed better than thinner ones. Samc99us can you elaborate more on the trailing edge thickness. Back to top
US772, Nice job making your own tunnel! I'm fortunate to have access to one at school, with far better measuring equipment but even it is not good enough for details like boundary layer transition detection. I just wrote an entire article pa fish and boat on why you need a thin TE but my fingers slipped and hit the back button on the browser. I'll go with the short version: Super low Reynolds number flow, sub 200,000, benefits from a super thin TE (Kutta condition). This region doesn't apply to our boats (hydrofoils or wings) as the Reynolds number range is greater (Miss Nylex paper says > 500,000). We are also using symmetric foils which by their nature have a thicker TE than the foils I was looking at (FX60-100 for example). However, their still may be some benefits to thinner foils, as Blunted suggests starting with a NACA 0012 for the first 55% of the wing and switching to a NACA 0009 for the 45% chord trailing edge flap. The 0009 is obviously thinner than the 00012. I would be curious to test some of the MH series foils (MH30, 32 come to mind) against the NACA series as these have been refined for low Reynolds number operation and may perform better in certain situations on a wing or rudder/daggerboard. Its also curious that the wing section that produced the best L/D wasn't published in the Miss Nylex paper. It would be awesome to have some wing building plans but I understand the amount of time Steve and Blunted etc. have poured into the effort over the past decade or so and they deserve to be compensated. pa fish and boat I think the biggest expense for most of us is the tooling costs, molds to build carbon ribs aren't exactly cheap. Back to top
Are ribs still built in female molds or done in another manner? These molds may be "relatively" inexpensive but I could see upwards of $10k worth of tooling solely for the ribs, not exactly something the backyard builder can just do. LE tooling is probably another $10k on top of that, or maybe more? Back to top
On a lot of the wing at the ICCC the lower ribs where made from a carbon/honeycomb/carbon layup. It looked like the honeycomb was 2 or 3mm thick, and