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Daggerboards and rudders for AO14


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Ok, - yeah yeah, I know seasons already started, but new baby has delayed getting the other baby out of the carport. The other baby is a Alpha Omega 4.3 with the big (13.5 m2) cat rig.

My problem is this:

The previous owner was a recreational shallow lake sailer and has replaced the original boards with a lovely looking('glass over cedar and ash), but somewhat useless(for an AO) set of boards from a Paper Tiger - (hull depth at slots is much greater on the AO compared to a PT). Also - the rudders have been replaced by what looks like a set of shortened Hobie14 rudders (blunt, heavy and short).

The ensuing result is a cat that doesn't point very well, generally handles like crap, and is rather difficult to tack.

I have aquired LxW specs of the original boards and rudders but not profiles or shapes. I'm thinking NACA 00012 and 00010 profiles will be somewhere close, but not sure. Also, I have no idea what shapes would be best suited for each.

I can competently home-build in cedar and carbon(or kevlar/aramid) so construction is not a problem, but resources on the net in terms of modern fin shapes for cats are virtually non-existent.

Can anyone offer wisdom/plans/links/opinions or anything else that will help??? Even some old boards and rudders sitting around that no-one needs. I aim to make them in the Chrissie break if it comes to making new ones, or is it all too silly and I should look for s/hand A-class fins?

Many Thanks

btw: a lovely set of glass over cedar and ash dagger boards for a Paper Tiger will be on offer soon as new boards are completed!

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my tuppence - the width of the dagger slot sounds like it'll dictate the measurement - ie chord and NACA number, if you get smart you'll have a baggy board which isn't fast!

there's a free program called Profili from which you can get drawings printed to make a template (the free version doesn't do profiles). NACA 4's should be ok for most speeds I would guess. There's heaps of info on the Moth forums but you'll find people very cagey about profiles (although I'd bet that the moth vertical profiles are standard).

KO

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http://www.catsailor.com/gallery/displayimage.php?album=random&cat=10074&pos=-414

go here for images of my AO which give an idea of the centreboard shape - these are the early ones with the later model ones one solid piece with a tapered top .

contact Darryl Barrett as he was the Ao builder and still has the centreboard and rudder moulds

ao14@optusnet.com.au

tel adelaide 8362 0877 if this is still the correct number for the AO and F14 association

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