Your last post got me thinking. You basically canted an asymmetrical foil to provide lift for the windward hull.
It occurs to me that canting the rudders on the leeward hull could do the same thing and the canting could control the turning and leeway of the boat at the same time.
The foils would work better on the outside of the hull rather than between the hulls. Basically the leading foil turns the boat to the windward hull, vertical has the most turning moment and the more horizontal the foil the more lift and less turning moment and less resistant to leeway.
There are two downsides, that I can see though. The first is that the turning momentum would be similar to a rudder restricted to less than 5 degrees or so. and the second is that the trailing foil would be exerting more upward force than the forward foil, aggravating the bow down attitude.
If you went with two axis control of the rudders then there would be no downside (drag penalty) other than the additional hydraulic ram.
Or perhaps more interestingly, you could go with an asymmetrical lee hull to compensate for the leeway, add two canting rudders to the outside of the windward hull and have a fully foiling hydrofoil.
Your current rudder configuration is already close, and you are currently paying the drag penalty for surface piercing foils anyway. I am thinking J or C shaped foils : )
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Posted by: taladorwood@yahoo.com.au
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