| 摘要 |
A low drag ship hull (10) generally includes a side air cavity (14) initiated by wetted bow section (16), bottom air cavity (18) initiated by wetted bottom nosepiece (20), wetted stern section (22) that closes a lower portion of the side cavity, wetted bottom tailpiece (24) that closes the bottom cavity, stabilizing fin (26), and propulsor (30). The bottom (2) of a catamaran hull cross structure includes bow impact alleviator (32). Optional flaps (34) in the stabilizing fins, together with optional all-movable cannard fins (28) are used for control. Different wetted bow sections and retractable plates (58) are used for starting side cavities. A low drag hull may utilize multiple air cavities. A new low drag hull includes a new upper bottom air cavity (90) that is initiated by an upper bottom wetted nosepiece (20), and closed by an upper bottom tailpiece (24). Alternative designs include a shortened forward hull spaced ahead of a shortened aft hull, and a hydrofoil-supported trimaran (230) with low drag hulls (246, 248). |
