US3752110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Afterplane for marine jet-powered boats
Assignee: HARDIN MARINE A CORP OF
•
Filing: 1972-03-20
•
Granted: 1973-08-14
•
Expires: 1992-03-20
Abstract
Abstract In a jet-powered boat wherein water is drawn through an inlet opening in the bottom of the hull, accelerated by an impeller pump and discharged through a jet nozzle to propel the boat forwardly, the improvement wherein an afterplane is secured to the boat rearwardly of the inlet opening, the afterplane being positioned so that the water flowing past the hull just below the layer of water taken into the inlet opening flows past and in contact with the underplane to exert upward forces thereon.
Inventors
- 👤 R Rhoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:59
CPC Classifications
B; B63; B63H; B63H11/00; B63H11/02; B63H11/04; B63H11/08; B63B; B63B1/00; B63B1/16; B63B1/18; F; F01; F01B; F01B23/00; F01B23/02; F01B23/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
143 words
In a jet boat having a jet propulsion system including a rearwardly projecting jet nozzle, an impeller pump discharging into said nozzle, and a flow channel from the impeller pump to a water inlet in and through the bottom of the hull of the boat, the improvement comprising: an afterplane plate mounted on said boat, said afterplane plate having a width subsTantially equal to the width of said flow channel inlet and extending a substantial distance rearwardly from the rear edge of said flow channel inlet, said afterplane plate being substantially parallel to the planing surface of the hull in the vicinity of said flow channel inlet, and said afterplane plate being positioned vertically relative to said boat that water flowing just under the water taken into said flow channel will flow against and along said afterplane plate in upward reactive engagement therewith.
Claim 2
Dependent Claim
143 words
In a jet boat having a jet propulsion system including a rearwardly projecting jet nozzle, an impeller pump discharging into said nozzle, and a flow channel from the impeller pump to a water inlet in and through the bottom of the hull of the boat, the improvement comprising: an afterplane plate mounted on said boat, said afterplane plate having a width subsTantially equal to the width of said flow channel inlet and extending a substantial distance rearwardly from the rear edge of said flow channel inlet, said afterplane plate being substantially parallel to the planing surface of the hull in the vicinity of said flow channel inlet, and said afterplane plate being positioned vertically relative to said boat that water flowing just under the water taken into said flow channel will flow against and along said afterplane plate in upward reactive engagement therewith.
Claim 3
Dependent Claim
87 words
In a jet boat as set forth in claim 1, wherein said boat has a guide vane in said flow channel, which guide vane projects outwardly and forwardly from said flow channel inlet, and wherein the angle between a line drawn from the forward edge of said afterplane plate to the forward edge of said guide vane and a line drawn through the forward edge of said guide vane parallel to said planing surface of said hull is substantially equal to the planing angle of said boat.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |