Hi All
Just while were on the subject of daggerboards, which would be the best profile to use, I'm thinking in terms of a board at 290mm wide x 23.2mm thick, i.e 8%, do you stick with the 0008 section or go for something like a 63008 section?
Regards
The 63008 is a laminar flow section, and should be avoided for daggerboards. Yes, laminar sections are lower drag, but any vertical scratches (inevitable on daggers) will destroy the laminar flow property, and they will behave worse than the normal 00XX series. Laminar flow sections must have a flawless surface to realize their benefits, and are therefore better suited to rudders and fixed keels on racing boats stored on land.
As for thickness, I've heard that 0009 and 0010 are really hard to improve on for marine applications. Going thinner makes the boards weaker, and you will not be able to build as high aspect ratio board. Assuming you want the highest aspect ratio boards possible to minimize drag, reducing thickness from 0009 to 0008 will force you to reduce aspect ratio by more than 20%, for the same area, load, and construction. With all the stories of boards breaking,
I don't think I'd drop below the conventional wisdom of 0009.
But I'm not expert.
