Hulls for planing and semi-planing craft
AssigneeFuturetech Technologies Limited
InventorIan James Duncan
Life of this patent
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Abstract
The invention relates to hulls for planing or semi-planing water craft. The hull (4) has an abruptly down-swept trailing edge portion (18) which, in the preferred embodiment, is in the form of a flap extending across the full width of the transom of the hull and which projects beyond the level of an upswept portion of the underside (14) of the hull by only a small fraction of the length (L) of the hull. According to another aspect of the invention, a hull (4) having a lightly cambered nose portion (5, 10, 12) is also described and claimed. The claimed hulls offer higher lift coefficients and lift/drag ratios than conventional planing hulls, and can operate at zero angle of attack at design speed.
Claims18
A hull (4) for planing or semi-planing water craft, the hull having a lower surface (14) and an abruptly down-swept trailing edge portion (18);
- characterzed in that a blending surface (15) is provided between the lower surface (14) and the trailing edge portion (18), wherein said trailing edge portion is provided in the form of a flap means (18) projecting downwardly from the hull (4) and where the angle (3) of the flap means (18) is fixed.
Dependencies are inferred from the claim text.