This would be a great topic to get clarified, because the rudders are an area of concern for a number of us, I think.
I would like to be able to remove the stress from the rudders when sailing at high speed. If I didn't want shallow draft, I would consider a fixed keel. I still might consider a 1' stub keel, maybe 6 feet long, under the lw hull. If I could get a motoring draft of 2', that would be ok. I don't expect to sail it hard in really shallow water; I just want to be able to sail it lightly, which would not depress the lw hull much.
I am pretty sure that Rob has stated that is just an issue of building the rudders as strong as they need to be, but I would like to better understand the relationship between the forces required for steering and the forces required for leeway protection.
- Gardner
On Mon, Aug 3, 2009 at 12:19 PM, jrwells2007 <jrwells2007@yahoo.com.au > wrote:
If I remember correctly, a harryproa can be sailed with only the stern over-sized rudder so the usual balancing of the CE and the CLR is not particularly applicable.
Rob or someone will correct me but I think that the lack of leeboards or centreplates is to avoid the cost and complication of a third foil. Bear in mind that there is a long hull with considerable lateral resistance.> Ok, I like the explanation, but I am still having problems finding it. On a
> harryproa, I know that the CE of the sails is aft of the mast, because it is
> a rotating rig. The center of lateral resistance should be right at the
> mast, since the hulls are symmetrical. So, if I put the leeboard next to the
> mast, right in the center, that should satisfy.
>
> So, I am still confused, since that is apparently the wrong answer. I hate
> it when I look in the back of the book for the answer and still can't work
> it out <grin>
>
> - Gardner
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