| 摘要 |
<p>A hull (7) and keel (3) includes a keel (3) with enough buoyancy to support its own weight, including any ballast (2), and enough additional buoyancy to support the weight of the hull (7) to which it is attached so that the hull (7) rests on, or near, the surface of the water (1). The length of the keel (3) exceeds five times the width of the keel (3). Where the hull (7) and keel (3) meet, the hull (7) has flat surfaces (4, 6) which are disposed on or near the surface of the water (1).</p> |
