looking for daggerboard plans catamaran

[gmartin]

I need to find plans for building daggerboard, case, and particularly control line setup for a cruising catamaran (30ft). Size doesn't matter, but not located by water, so I know nothing about how the control lines work, are set up, or the board and case made to allow the lines to work.

[DGentry]

Daggerboards, unless heavily weighted (which are then perhaps better called lifting keels), dont use control lines. Typically, you just lift them up or lower them manually. There are various methods of holding them in place - a bungee cord or dowels, etc, but no control lines.
Centerboards, which pivot inside a case, are a different matter.

I'd do a search for daggerboard construction and extrapolate from there for the size required for your boat. I know that's not much help . . . .

Good luck!
Dave Gentry

[Candyfloss]

Excuse my awfull drawing, but this is how we did it on "Katariana", 45' Ron Given cruising cat.

http://pic50.picturetrail.com/VOL458/12377907/22018525/377900842.jpg

The centerboard has a deep cut-out at the top. At the bottom of the cutout, a hole is drilled down, then an intersecting hole drilled thru the board. The lifting line is threaded in, a knot tied in the end & thus secured.
At the top of the board a stainless pipe frame with feet is screwed. It has a loop to secure the holding-down line. (wooden boards tend to float,so must be held down). These two lines, one up, one down are taken to turning blocks on the deck, then to deck organizers, then to the main winches both sides.
The turning block for the up line is tricky. We fitted a halyard exit block into the edge of the slot, but the sheave must not intrude into the slot or the board will jam. You must not raise or lower the boards while there is any weight on them, ie while sailing.
Apart from that, the case was just 12mm ply, with 50x50 ends, glassed inside before assembling, made over-length, glassed into cut-outs in the hull & deck, trimmed after fitting. All the structural glass is on the inside of the boat, glass outside just for protection.
The boards were laminated 50x50 cedar, glassed over. You need to allow plenty for the glass. Best to have your board too lose than too tight! Glassing them was a bastard. We vacuum bagged them, which was much easier.
Good luck with your build.