Forums: Whisstock Designs: Centerboard New Topic Post Reply
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lrambeau
Posted: Aug 17th, 2013 at 15:41   |   Subject: Centerboard
I am just finishing-up and coating my 119 ring frames. Then I'll be moving on to spars while I still have the big work table set up. I live in the US northwest were draft is rarely an issue. Have you ever considered a fixed keel 119? Would it be too slow when tacking?
debenriver
Posted: Aug 17th, 2013 at 22:13   |   Subject: Centerboard
Hi Lynn

I'm very glad to hear that you are cutting wood! We spoke a while back about changing the rig – do you still wish to go down that route, in which case I am quite happy to do it and draw up the plans.

With respect to draft:

To produce a reasonable windward performance without a centreboard we really need to get the draft up to 700-750mm (28" - 30"). I think we could do that OK and she would go about without a problem because we would still keep the forefoot reasonably shallow. It would increase the wetted surface area a bit, which would add to the hull resistance.

Because she is basically a canoe body (rather than a wine glass shape), increasing the draft with a long keel produces quite a lot of deadwood aft – which isn't a problem structurally; it's just not as pretty as a traditional reverse curve hull with a tuck in the bilge.

Another option is of course a fin keel – which could go down to about 1200mm (48") or so draft. Again there is no structural problem – just looks a bit unusual on a traditional rig – not that that is a reason not to do it! You are definitely not a trailer-sailer any more.

A third option is to have a fixed keel down to about 650mm draft + a centreboard. In this case we might be able to squeeze the centreboard below the sole, so it wouldn't intrude into the cabin at all.

If you were to go for a cat rig, then we would need to consider rig and keel together as with a cat rig the vessel can become rather unbalanced off the wind, so we need to ensure that there is enough control to keep things in order.

Cheers

George