Hi Sam,

we are getting closer to diving into foils, but not quite there yet!
I dont remember if sections was included in the plywood plans. What I know have been used as a safe section earlier is NACA0007 for daggers and NACA0012 for rudders. But there is a whole world of sections available and tuning that can be done. A very nice catsailor here sent me profile data for a modified NACA0013 to be used as both daggers and rudders. Then there are DAG sections which are used on quite a few catamaran foils..

Planform is also very important.



Not too much info is available but most in the know-how will answer direct questions on a good day.
We will start with proven sections and planforms and eventually make insets if we build experimental sections later on.

Place your bets and hold your breath

Once you get the section sorted out, just make them 2 meters long...or longer.

;^)

2 meters!! Bethewaite was on to something but pulled out before it became ridicilous!

Welcome to modern cats, there is a table of standard F18 board sizes here (last page)

Thanks for the link. 1965x23x192mm is.. Well, a challenge.

Considering the lower boat and perhaps also crew weight of an F16 a smaller foil is probably the optimum. But the trend is clear. Longer and slimmer foils.. Where is the practical limit and is it only a trend that will reverse in time.. I dont know, but I do think we will continue to see long and slim foils

Picked this up on SA: " On an older A-Class with smaller transoms, the conversion from straight to curved boards may have a better chance for improvement if rudder winglets are also included in the upgrade.

There's no doubt that curved boards are here to stay. "

http://forums.sailinganarchy.com/index.php?showtopic=144251#entry4037605

I suppose, that if that is true, we should address the issue in the rules.

I would suspect currently, the limit would have to do with the stiffness of the foil using current materials/technology.

Until, that is, I develop "transparent aluminum"

Speaking as a player in the F18 fleet I don't see the daggerboard length trend ever reversing. Granted there is a pretty small window where they pay but that's where the game is being played now. I'm still running the short boards mainly because I like saying "It's not the length of your daggerboard it's how you use it"

enzyte baby...enzyte