GB2201929A - Blades for paddles and oars - Google Patents

Blades for paddles and oars Download PDF

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Publication number
GB2201929A
GB2201929A GB08705832A GB8705832A GB2201929A GB 2201929 A GB2201929 A GB 2201929A GB 08705832 A GB08705832 A GB 08705832A GB 8705832 A GB8705832 A GB 8705832A GB 2201929 A GB2201929 A GB 2201929A
Authority
GB
United Kingdom
Prior art keywords
blade
indentations
smooth
pattern
blade according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB08705832A
Other versions
GB8705832D0 (en
GB2201929B (en
Inventor
Robert Nightingale
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB8705832A priority Critical patent/GB2201929B/en
Publication of GB8705832D0 publication Critical patent/GB8705832D0/en
Publication of GB2201929A publication Critical patent/GB2201929A/en
Application granted granted Critical
Publication of GB2201929B publication Critical patent/GB2201929B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H16/00—Marine propulsion by muscle power
    • B63H16/04—Oars; Sculls; Paddles; Poles

Abstract

A blade for a canoe paddle has a front surface which is non-smooth. The non-smooth surface can be provided by way of a pattern of indentations 3, or by any other surface profiling - e.g. a combination of ridges, individual bosses, and indentations. The arrangement has been found to improve the characteristics of the blade as it passes through the water. <IMAGE>

Description

BLADES FOR PADDLES AND OARS This invention relates to blades for paddles or oars and in the preferred embodiment provides a blade having a surface on the front face thereof which is not smooth, and which improves the effectiveness of the blade as compared with a blade of comparable size and shape having a smooth front face.
Heretofore the front face (that is to say the face which is driven against the water as the blade makes a stroke) has been smooth and continuous, or has been provided with one or more through apertures. I have now found that if the smooth surface texture of the blade is disrupted, e.g. by way of a pattern of indentation, the effectiveness of the blade is improved.
Accordingly, one aspect of the present invention provides a blade for a paddle or oar having a front face at least a portion of which has a surface which is not smooth.
Preferably, the majority of the front face of the blade is provided with a non-smooth surface. The non-smooth surface may be provided by way of a pattern of indentation or by way of a pattern of protrusions, or by a combination of indentations and protrusions.
In the presently preferred embodiment of the invention a pattern of substantially square indentations is provided over a large part of the front surface of the blade.
The invention will be better understood from the following description of a preferred embodiment thereof, given by way of example only, reference being had to the accompanying drawing wherein: the single Figure shows the front face of the blade of a canoeing paddle.
Referring to the drawing, the blade 1 is of conventional shape, and is connected in use to a shaft 2 as will be well understood by those skilled in the art.
The front or drive face of the blade illustrated in the drawing would, in the prior art, have been smooth. In the embodiment of the invention illustrated, however, the majority of the front surface is provided with a pattern of indentations 3 each of which is substantially square and, when viewed in transverse cross-section, is substantially square-sided. In an embodiment of the invention indentations of 3.5mm square and between 0.15 and 0.25mm deep have been found satisfactory.
The pattern of indentations 3 preferably covers the entire surface of the front face bounded by the broken line 4.
The blade 1 is preferably formed by laying down a gel coat of suitable material on a mould and laying up fibres and resin on the gel coat to provide a composite FRP structure. In this case, the gel coat is preferably applied to such a thickness that the entire exposed surface of the blade, including the sides and hases of the indentations are formed by the get coat.
Whilst a particular and presently preferred pattern of indentations has been described for the purpose of providing the non-smooth surface, it will be appreciated that other patterns are possible. Further, the nonsmooth surface can be provided by way of projections from the surface, e.g. by way of ridges or individual bosses.
A combination of projections and indentations may prove desirable under some circumstances.
The exact mechanism by which the invention works is not at present fully understood, but it is believed that two factor contribute to the improved effectiveness of the blade. Firstly, the indentations increase the surface area of the blade without increasing the overall dimensions of the blade. In a blade having 1200 square identations each 3.5mm square and each having a depth of .2mm the indentations increase the area of the front face of the blade by 33.6cm2 as compared with a smooth blade. Since the force with which the water resists movement of the blade is substantially proportional to the area of the blade, this increase in area adds substantially to the force with which the water resists movement of the blade.
Secondly, as the blade in use mvoes through the water during the effective portion of a stroke, water spills around the edge of the blade, and some of the power applied to the blade is lost as turbulance. The indentations reduce the rate of water spillage, and thereby the power lost as turbulance. Trials show that blades having a pattern of indentations as described above consistently provide better results than comparable blades having a smooth surface.

Claims (9)

1. A blade for a paddle or oar having a front face at least a portion of which has a surface which is not smooth.
2. A blade according to claim 1 wherein the majority of the front face of the blade has a surface which is nonsmooth.
3. A blade according to claim 1 or claim 2 wherein the non-smooth surface is provided by a pattern of indentations in the surface of the blade.
4. A blade according to claim 3 wherein the pattern of indentations comprises at least an area having substantially square indentations.
5. A blade according to claim 4 wherein the square indentations are orientated such that a diagonal of each square is substantially parallel to the longitudinal axis of the blade.
6. A blade according to claim 1 or claim 2 wherein the non-smooth surface is provided by way of a pattern of protrusions.
7. A blade according to any of claims 1 to 5 wherein the non-smooth surface is provided by a combination of indentations and protrusions.
8. A blade according to claim 6 or claim 7 wherein the protrusions are in the form of ridges or individual bosses.
9. A blade substantially as hereinbefore described with reference to the drawing.
GB8705832A 1987-03-12 1987-03-12 Blades for canoe paddles and oars Expired - Lifetime GB2201929B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8705832A GB2201929B (en) 1987-03-12 1987-03-12 Blades for canoe paddles and oars

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8705832A GB2201929B (en) 1987-03-12 1987-03-12 Blades for canoe paddles and oars

Publications (3)

Publication Number Publication Date
GB8705832D0 GB8705832D0 (en) 1987-04-15
GB2201929A true GB2201929A (en) 1988-09-14
GB2201929B GB2201929B (en) 1991-04-24

Family

ID=10613805

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8705832A Expired - Lifetime GB2201929B (en) 1987-03-12 1987-03-12 Blades for canoe paddles and oars

Country Status (1)

Country Link
GB (1) GB2201929B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5147233A (en) * 1991-08-05 1992-09-15 Han's Paddles, Inc. Swimmer training paddle
GB2261418A (en) * 1991-11-16 1993-05-19 Geoffrey Fairbairn Oar or paddle blades

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB265022A (en) * 1926-03-09 1927-02-03 George James Ayling Improvement connected with oars and sculls
GB292080A (en) * 1927-06-10 1929-08-22 Jean Louis Ribard Improvements in or relating to surfaces to be exposed to pressure fluid
GB451652A (en) * 1935-05-06 1936-08-10 Walther Meienreis Improvements in and relating to oars
GB593442A (en) * 1945-05-04 1947-10-16 Frank Collar Foldable or collapsible oars, paddles, booms, spars or the like
GB766106A (en) * 1955-03-25 1957-01-16 Henry Lamar Sistrunk Table tennis bat and method of assembly
GB1347209A (en) * 1972-05-10 1974-02-27 Heller M Sledges or gliding appliances
US4128239A (en) * 1976-10-29 1978-12-05 Lewis Grenadier Solid molded paddle construction
US4302194A (en) * 1980-04-14 1981-11-24 Perales Gavino R Combined aquatic support and propulsion device
US4493663A (en) * 1983-01-10 1985-01-15 Richmond Raymond W One-handed paddle
GB2151931A (en) * 1983-11-30 1985-07-31 Juan Nicola Bats e.g. for table tennis

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB265022A (en) * 1926-03-09 1927-02-03 George James Ayling Improvement connected with oars and sculls
GB292080A (en) * 1927-06-10 1929-08-22 Jean Louis Ribard Improvements in or relating to surfaces to be exposed to pressure fluid
GB451652A (en) * 1935-05-06 1936-08-10 Walther Meienreis Improvements in and relating to oars
GB593442A (en) * 1945-05-04 1947-10-16 Frank Collar Foldable or collapsible oars, paddles, booms, spars or the like
GB766106A (en) * 1955-03-25 1957-01-16 Henry Lamar Sistrunk Table tennis bat and method of assembly
GB1347209A (en) * 1972-05-10 1974-02-27 Heller M Sledges or gliding appliances
US4128239A (en) * 1976-10-29 1978-12-05 Lewis Grenadier Solid molded paddle construction
US4302194A (en) * 1980-04-14 1981-11-24 Perales Gavino R Combined aquatic support and propulsion device
US4493663A (en) * 1983-01-10 1985-01-15 Richmond Raymond W One-handed paddle
GB2151931A (en) * 1983-11-30 1985-07-31 Juan Nicola Bats e.g. for table tennis

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5147233A (en) * 1991-08-05 1992-09-15 Han's Paddles, Inc. Swimmer training paddle
GB2261418A (en) * 1991-11-16 1993-05-19 Geoffrey Fairbairn Oar or paddle blades

Also Published As

Publication number Publication date
GB8705832D0 (en) 1987-04-15
GB2201929B (en) 1991-04-24

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20000312