US3745963A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boat structure
Assignee: Individual
•
Filing: 1970-08-14
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Granted: 1973-07-17
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Expires: 1990-08-14
Abstract
Abstract The invention is a new boat structure and a method of boat propulsion. The hull has a propeller receiving cavity in the aft portion which is open to the bottom and the stern of the boat. It is of size and construction to receive only a portion of the propeller, and in operation the cavity is substantially out of the water. The boat has a power source to drive the propeller, and steering apparatus mounted in the hull to steer the boat. The new method of the invention provides a means of propulsion for a boat hull wherein in operation the driving propeller blade is in the water only approximately one half the time, and the cavity provided in the bottom of the stern of the boat hull out of the water receives the blade of the propeller during its travel out of the water. The preferred specific embodiment of the new method utilizes two such propellers in operation, turning on axis longitudinal to the longitudinal axis of the boat hull, substantially parallel and spaced on either side of the boat hull longitudinal axis, with the propellers rotating in opposite direction. A central cushion of air beneath the boat hull is provided in operation.
Inventors
- 👤 W Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:51
CPC Classifications
B; B63; B63H; B63H5/00; B63H5/07; B63H5/16; B63B; B63B1/00; B63B1/16; B63B1/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
144 words
A boat structure comprising: a. a hull structure having a somewhat flat bottom portion, a substantially vertical transom, and upturned and pointed bow portion, and b. said hull structure has an upwardly curved center portion extended forwardly from said transom, each side of said curved center portion is integral through a chine edge with respective horizontal rocker areas whereby said boat in optimum operation in a body of water contacts said body of water substantially only on said rocker areas and said center portion is above said water, said center portion representing the major portion of the bottom of said boat adjacent said transom, and the curvature of same is such that in operation of said boat in said body of water a supporting cushion of air is formed between the water and the area of said boat hull having said curved center portion.
Claim 2
Dependent Claim
144 words
A boat structure comprising: a. a hull structure having a somewhat flat bottom portion, a substantially vertical transom, and upturned and pointed bow portion, and b. said hull structure has an upwardly curved center portion extended forwardly from said transom, each side of said curved center portion is integral through a chine edge with respective horizontal rocker areas whereby said boat in optimum operation in a body of water contacts said body of water substantially only on said rocker areas and said center portion is above said water, said center portion representing the major portion of the bottom of said boat adjacent said transom, and the curvature of same is such that in operation of said boat in said body of water a supporting cushion of air is formed between the water and the area of said boat hull having said curved center portion.
Claim 3
Dependent Claim
103 words
The boat structure as described in claim 1, wherein: a. said center portion and said rocker areas extend from the stern of said hull forward a short distance with constant dimensions and extend forward therefrom with diminishing dimensions to blend with said upturned bow portion of same, b. a driving means mounted in a propeller receiving cavity in said hull structure operable to rotate a propeller, and c. a steering means mounted on said hull structure operable to steer said boat, whereby said boat in operation has only a portion of said propeller therein said cavity and not in the body of water.
Claim 4
Dependent Claim
90 words
The boat structure as described in claim 1, wherein: a. said hull structure has a propeller receiving cavity which is partially cylindrical In transverse cross-section, has a partially rounded forward end portion and is integrally formed with said hull structure, b. said cavity in the stern end portion thereof has a rudder pivotally mounted vertically and extending therethrough said cavity extending therebelow said hull bottom, and c. a driving means in said propeller receiving cavity has a propeller with less than half of said propeller partially in said receiving cavity.
Claim 5
Dependent Claim
52 words
The boat structure as described in claim 1, wherein: a. said hull structure includes a cavitation plate extended rearwardly across the outer portions of said transom having a portion thereof positioned on opposite sides of said curved center portion to provide adjustable, additional support to increase the stability of the boat structure.
Claim 6
Independent Claim
137 words
A method of propelling a boat having a hull, a propeller means, and a driving means therefore, comprising: a. operating said propeller means in a vertical plane, b. transferring energy to the water by said propeller means, c. operating said propeller during the cycle of rotation with the propeller partially contained in the water and partially out of the water, d. having a supporting cushion of air under a center portion of said hull and over a major portion of the width thereof at the stern thereof, said hull having horizontal aft rocker portions representing a minor portion of the bottom of said boat at the stern thereof and extended outwardly of said center portion, and e. supporting the structure of said boat on said aft rocker portions in contact with the water when propelling said boat.
Claim 7
Independent Claim
137 words
A method of propelling a boat having a hull, a propeller means, and a driving means therefore, comprising: a. operating said propeller means in a vertical plane, b. transferring energy to the water by said propeller means, c. operating said propeller during the cycle of rotation with the propeller partially contained in the water and partially out of the water, d. having a supporting cushion of air under a center portion of said hull and over a major portion of the width thereof at the stern thereof, said hull having horizontal aft rocker portions representing a minor portion of the bottom of said boat at the stern thereof and extended outwardly of said center portion, and e. supporting the structure of said boat on said aft rocker portions in contact with the water when propelling said boat.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |