US3626894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tunnel stern boat
Assignee: PENN YAN BOATS Inc
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Filing: 1970-06-01
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Granted: 1971-12-14
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Expires: 1990-06-01
Abstract
Abstract The tunnel of a tunnel stern planing boat is given an improved shape for greater efficiency. The tunnel is gradually and smoothly enlarged as it extends aft toward the propeller, and it has a semicylindrical top fitting relatively closely over the propeller in the plane of the propeller. Then the tunnel extends aft of the propeller a short distance with a gradually enlarging cross-sectional area preferably formed by divergent sidewalls of the tunnel.
Inventors
- 👤 Robert B Stuart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:37
CPC Classifications
B; B63; B63H; B63H5/00; B63H5/07; B63H5/16
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
116 words
In a tunnel stern planing boat having a tunnel open at the transom of said boat, a propeller arranged in said tunnel, means for rotating said propeller, and a rudder arranged aft of said tunnel, an improved tunnel shape comprising: a. the portion of said tunnel forward of said propeller having a gradually enlarging cross-sectional area proceeding aft toward said propeller; b. in the plane of said propeller, said tunnel having a top portion fitting relatively closely over said propeller; c. said tunnel extending a relatively short distance aft of said propeller; and d. the portion of said tunnel aft of said propeller having a cross-sectional area that gradually enlarges with distance aft of said propeller.
Claim 2
Dependent Claim
116 words
In a tunnel stern planing boat having a tunnel open at the transom of said boat, a propeller arranged in said tunnel, means for rotating said propeller, and a rudder arranged aft of said tunnel, an improved tunnel shape comprising: a. the portion of said tunnel forward of said propeller having a gradually enlarging cross-sectional area proceeding aft toward said propeller; b. in the plane of said propeller, said tunnel having a top portion fitting relatively closely over said propeller; c. said tunnel extending a relatively short distance aft of said propeller; and d. the portion of said tunnel aft of said propeller having a cross-sectional area that gradually enlarges with distance aft of said propeller.
Claim 3
Dependent Claim
26 words
The tunnel shape of claim 1 wherein the walls of said tunnel portion aft of said propeller diverge at an angle of from 5* to 15*.
Claim 4
Dependent Claim
23 words
The tunnel shape of claim 1 wherein said enlarging cross-sectional area aft of said propeller is provided by divergent sidewalls of said tunnel.
Claim 5
Dependent Claim
26 words
The tunnel shape of claim 1 wherein said tunnel extends aft of said propeller for a distance approximately equal to one-half a radius of said propeller.
Claim 6
Dependent Claim
12 words
The tunnel shape of claim 1 wherein said top portion is semicylindrical.
Claim 7
Dependent Claim
30 words
The tunnel shape of claim 1 wherein said tunnel portion forward of said propeller is generally rectangular in cross section and is formed to blend gradually into said top portion.
Claim 8
Dependent Claim
26 words
The tunnel shape of claim 6 wherein said forward portion of said tunnel has a substantially constant width and enlarges in height as it proceeds aft.
Claim 9
Dependent Claim
31 words
The tunnel shape of claim 1 wherein said tunnel portion forward of said propeller is generally arch-shaped in cross section and enlarges in both width and height as it proceeds aft.
Claim 10
Dependent Claim
24 words
The tunnel shape of claim 1 wherein junction edges between said tunnel and the outer hull surface of said boat are rounded and smooth.
Claim 11
Dependent Claim
38 words
The tunnel shape of claim 1 wherein a region of said tunnel just forward of said plane of said propeller has a cross-sectional area larger than the cross-sectional area of said tunnel at said plane of said propeller.
Claim 12
Dependent Claim
27 words
The tunnel shape of claim 10 wherein said enlarging cross-sectional area of said tunnel portion aft of said propeller is provided by divergent sidewalls of said tunnel.
References Cited (Backward Citations)
US3138130A
Cited
US3515087A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |