Sailing Experience

Well, it's not that simple. The keel will be more comfortable since you don't have to worry about it, but it will increase draft. Running you can extract the daggerboard which you can't with a keel and the daggerboard is another thing to deal with.

Does a daggerboard have any significant advantage ? I've never used one.

 

So it is a personal decision, ask your wife - she will tell you

Read my lips, they don't move whilst I am typing, Not sufficient difference to warrant beyond convenience & ability to get back sailing & fishing.....

 

I'm sure me ol witch will tell me lots of things once she landed with her broom

 

"Daggerboard or centerboard options will be available. The daggerboard is the simplest and most efficient ... " Ian Farrier, Kiwi designer of trailerable Farrier 22.

"Draft (hull only) 1' 0" (0.3 m) — Draft (board down) 4' 8" (1.4 m)" Corsair 24 trailerable trimaran specs

"A trimaran with a centerboard or a daggerboard is generally faster and can point higher than a similar-size catamaran with fixed keels or daggerboards in the hulls." Sail Magazine, 2007 Buyers Guide

For such a small tri, I was thinking a daggerboard would be simplest, but apparently designers feel there are performance benefits also.

Your wife will probably agree with them.

 

The wife may feel the same way if I get a daggerboard too

I may go for the daggerboard because when retracted the draft is very shallow.

Would it work better slightly foreward of the sail centre force position ?

 

Many side views of Farrier's F22 here. Daggerboard just aft of the mast.

http://www.f-boat.com/pages/trimarans/F-22.html

Another tri, same location.

http://www.f-boat.com/pages/trimarans/F-82.html

More same:
http://www.edhorstmanmultihulldesigns.com/specs/TRI-18_3view.pdf

http://www.graingerdesigns.com.au/stock-plan-detail-145.php

Could be a trend.

 

Well, my mast is 500mm from the transom. I'll have to combine the rudder and the daggerboard then

Don't worry, I think I will want it just slightly foreward of the sail centre of force. Female instinct if you want

 

On a Bermuda rig, just aft of the mast is a bit forward of the main's center of force. I forgot you're inventing a new rig as well as building your first tri. Eating the whole haggis, as our Scots pals would put it!

I do wonder if moving it (the daggerboard, not the mast) too far aft would tend to drive the bows under in a stiff breeze?

 

Last time I sailed my aft masted little tri - in the two hours of mild wind there was - it didn't have a daggerboard or keel on it (lots of side-drift ) with the mast aft it sat right on top of the water. The hulls would burrow more if I stand on them.

My friends bermuda sailed tri's hulls goes right under - he said since we fitted the jib he can feel the amount of lift the jib gives. Before the jib he couldn't go faster than 16km/hr as the hull's would sink into the water - with the jib we got between 20 and 30km/hr.

Now I've never been in any kind of wind that I could say is lifting my tri up out of the water, but it defenately doesn't push the hull's into the water like the bermuda does. You can look at it sailing here
http://www.youtube.com/watch?v=XJzE6HmIYNI

The sailing area is about 8m^2, the mast is bending a lot without stays, so the forestay goes really limp, nou daggerboard or keel. I was on a reach when I took the video, watch the leeward hull. You'll also note the windward hull doesn't lift much.

 

Looks like just forward of center of effort would be just forward of those ugly feet.

Different rig, same propulsive force, same location for the 'board, should work!

 

I have since increased the sailing area to 12m^2 (from 8m^2) - got the sails back on Monday.

I was wondering if it is going to make a big difference

 

That's ok, I just walk on them, or do the steering with them. TBH in general I couldn't care what they looked like

 

Little tri

Fanie you have done a remarkable job (blood - sweat - tears) your build photo pages are fantastic. GO MAN GO

 

What happened to moonlight and roses... ?

I have some more work to do on the little tri but things keeps on interfering with it. And now Charlie is hinting I should do something about my stompers as well.

 

Hay you saffers, look out where you pee.... News break, some "white guys were caught pissing on food and giving it to the cleaners at the uni to eat - idiots videord their effort... Effing ijiots - in front of the courts now & many locals are wanting more than blood......