United States Patent
US Patent 4079688: Displacement hull
US 4079688 · granted 1978-03-21
| Patent Number | 4079688 |
|---|---|
| Title | Displacement hull |
| Filed | 1976-08-12 |
| Granted | 1978-03-21 |
| Inventor(s) | George L. Diry |
| Assignee | Individual |
| CPC Classification | B63B1/04, B63B1/00, B63B1/02 |
| Number of Claims | 2 |
Abstract
A low-drag hull for high-speed displacement type water-craft is constructed with a constant-section keel-less midbody having a length equal to or greater than one-third of the waterline length of the hull, and with a run of less than one-sixth of the hull length. The balance of the hull comprises a slender entry defined by a linear basal ramp extending at the centerline for at least one-half of the length of the entry. The ramp slope is chosen in the range between 10:1 and 18:1. The parallel midbody is constructed with a full cross-section, the section coefficient being always greater than .785, and the ramped entry conforms, within the limits established by the need to fair in the bow and transition sections, to the sectional character of the midbody. The hull form shows a low wetted surface coefficient and sharply reduced wave-making resistance in the range between Froude numbers of 0.60 and 1.20.
Claims Summary
1. A fully bouyant bilaterally symetrical displacement hull for high-speed waterborne craft comprising an entry, a constant section midbody, and a run, said hull having a wetted portion which extends along the length of the hull wherein:said constant section midbody extends over at least one third of the wetted length of the hull;