US4487152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boat stabilizer
Assignee: Individual
•
Filing: 1974-06-24
•
Granted: 1984-12-11
•
Expires: 1994-06-24
Abstract
Abstract A stabilizer for boats, the stabilizer being of generally delta planform, having a positive upper camber and a negative lower camber in chordwise cross section, being mountable upon a propeller post and in adjacent spaced relation from the propeller and adapted to be submerged, the stabilizer providing a lifting force to the stern, a downward force to the bow and a generally stabilizing affect upon the boat to which it is adapted.
Inventors
- 👤 Wilfred Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:28
CPC Classifications
B; B63; B63H; B63H20/00; B63H20/32; B63H20/34; B63B; B63B39/00; B63B39/06; B63B39/061; F; F02; F02B; F02B61/00; F02B61/04; F02B61/045
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
221 words
A stabilizer capable of being fitted over a cavitation plate located on a motor post of a boat motor so as to extend outwardly around said motor post, said stabilizer comprising: a foil member having a generally delta wing shape and including a nose portion located in front of said post, leading edges extending outwardly from opposite sides of said nose portion towards the rear of said foil member, ends located at the extremities of said leading edges remote from said nose portion and a trailing edge extending between said ends to the rear of said post, said foil member being shaped so as to provide an upwardly directed force tending to lift said stern of said boat as said motor is operated and having as a part of said shape a positively cambered upper surface, said foil member also having a groove extending between its upper and lower surfaces from said trailing edge and extending towards said nose and a slot extending into said foil member from said groove, said groove being sufficiently large so as to extend around said post, said groove and said slot being dimensioned so that said foil member is capable of being positioned on said post by being slid around said post into a position such that said anti-cavitation plate is fitted within said groove.
Claim 2
Dependent Claim
221 words
A stabilizer capable of being fitted over a cavitation plate located on a motor post of a boat motor so as to extend outwardly around said motor post, said stabilizer comprising: a foil member having a generally delta wing shape and including a nose portion located in front of said post, leading edges extending outwardly from opposite sides of said nose portion towards the rear of said foil member, ends located at the extremities of said leading edges remote from said nose portion and a trailing edge extending between said ends to the rear of said post, said foil member being shaped so as to provide an upwardly directed force tending to lift said stern of said boat as said motor is operated and having as a part of said shape a positively cambered upper surface, said foil member also having a groove extending between its upper and lower surfaces from said trailing edge and extending towards said nose and a slot extending into said foil member from said groove, said groove being sufficiently large so as to extend around said post, said groove and said slot being dimensioned so that said foil member is capable of being positioned on said post by being slid around said post into a position such that said anti-cavitation plate is fitted within said groove.
Claim 3
Dependent Claim
37 words
A stabilizer as claimed in claim 1 wherein: said foil member includes means for securing said foil member to said motor post by engaging said anti-cavitation plate, said means for securing being located on said foil member.
Claim 4
Dependent Claim
29 words
A stabilizer as claimed in claim 1 wherein: said leading edges are straight and are located at an angle of from 10° to 50° with respect to one another.
Claim 5
Dependent Claim
58 words
A stabilizer as claimed in claim 4 wherein: said foil member includes means for securing said foil member to said motor post by engaging said anti-cavitation plate, said means for securing being located on said foil member, said leading edges are straight and are located at an angle of from 10° to 50° with respect to one another.
Claim 6
Dependent Claim
262 words
In the combination of a boat, a motor located on the stern assembly, said motor having a motor post extending downwardly from said stern, a propeller mounted on said post adjacent to the lower end thereof and an anti-cavitation plate located on and extending outwardly from said post and a stabilizer means mounted on said post the improvement which comprises: said stabilizer means comprising a foil member located on said anti-cavitation plate, said foil member having a generally delta wing shape and including a nose portion located in front of said post, leading edges extending outwardly from opposite sides of said nose portion towards the rear of said foil member, ends located at the extremities of said leading edges remote from said nose portion and a trailing edge extending between said ends at the rear of said post, said foil member being shaped so as to provie an upwardly directed force tending to lift said stern of said boat as said motor is operated and having as a part of said shape a positively cambered upper surface, said foil member also having a groove extending between its upper and lower surfaces from said trailing edge and extending towards said nose and a slot extending into said foil member from said groove, said groove being sufficiently large so as to extend around said post, said groove and said slot being dimensioned so that said foil member is capable of being positioned on said post by being slid around said post into a position such that said anti-cavitation plate is fitted within said groove.
Claim 7
Dependent Claim
262 words
In the combination of a boat, a motor located on the stern assembly, said motor having a motor post extending downwardly from said stern, a propeller mounted on said post adjacent to the lower end thereof and an anti-cavitation plate located on and extending outwardly from said post and a stabilizer means mounted on said post the improvement which comprises: said stabilizer means comprising a foil member located on said anti-cavitation plate, said foil member having a generally delta wing shape and including a nose portion located in front of said post, leading edges extending outwardly from opposite sides of said nose portion towards the rear of said foil member, ends located at the extremities of said leading edges remote from said nose portion and a trailing edge extending between said ends at the rear of said post, said foil member being shaped so as to provie an upwardly directed force tending to lift said stern of said boat as said motor is operated and having as a part of said shape a positively cambered upper surface, said foil member also having a groove extending between its upper and lower surfaces from said trailing edge and extending towards said nose and a slot extending into said foil member from said groove, said groove being sufficiently large so as to extend around said post, said groove and said slot being dimensioned so that said foil member is capable of being positioned on said post by being slid around said post into a position such that said anti-cavitation plate is fitted within said groove.
Claim 8
Dependent Claim
36 words
The combination claimed in claim 5 herein: said foil member includes means for securing said foil member to said motor post by engaging said anti-cavitation plate, said means for securing being located on said foil member.
Claim 9
Dependent Claim
28 words
The combination claimed in claim 5 wherein: said leading edges are straight and are located at an angle of from 10° to 50° with respect to one another.
Claim 10
Dependent Claim
57 words
The combination claimed in claim 5 wherein: said foil member includes means for securing said foil member to said motor post by engaging said anti-cavitation plate, said means for securing being located on said foil member, said leading edges are straight and are located at an angle of from 10° to 50° with respect to one another.
References Cited (Backward Citations)
US2319640A
Cited
GB716879A
Cited
US2963000A
Cited
US2998795A
Cited
US3114343A
Cited
US3099240A
Cited
US3139853A
Cited
US3211119A
Cited
US3343512A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |