The hydrodynamic resistance of a foil is greatly reduced when presented transversally to the forward motion of a boat. A high aspect ratio (span-chord) of a lifting surface such as presented on the renderings, can be useful to get on a plane by increasing the lift drag ratio at low cost in terms of resistance.
The lifting surface adds to the righting moment and the foil buoyancy resists the heeling moment.
Placed aft, on the cockpit sole and sliding to the side of the hull like a dagger board, the aileron presents no particular complication.
The shape of the stern is designed to control the angle of attack of the foil to produce the least resistance when slicing through waves, while the weight of the swing keel controls the angle of incidence being forced by the foil action.
PS: I see a serious application with powerboats to control squat down in one hand, and to promote planing on the other.
Pourquoi placer l'aileron si en AR où les mouvement verticaux au tanguage sont très important. Un brevet US sur ce procédé le situe en milieu de carène. (Ce brevet couvre quel domaine de l'aileron ?)
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Meant US Patent from Infinity DSS
ReplyDeleteIn placing the Side Board, I have considered the various options indicated by the Patented Palmquist's WingMaran (forward),the Dss (middle) and my own conclusion (aft). Because of the hull shape itself, I decided to use the stern for the best location for my board. The believe is that the combination Hull/Board is best achieved for testing, construction and control. I think for instance that hobby horsing is more accentuated by having the board in the middle; location of the centre of buyoancy and gyration. Of course, this is all experimental, and only on paper. I am pursuing the project further by having on the drafting board a 23/24' version for a "Garage" build.
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