GB2177666A - Propulsion means for water craft - Google Patents

Propulsion means for water craft Download PDF

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Publication number
GB2177666A
GB2177666A GB08506821A GB8506821A GB2177666A GB 2177666 A GB2177666 A GB 2177666A GB 08506821 A GB08506821 A GB 08506821A GB 8506821 A GB8506821 A GB 8506821A GB 2177666 A GB2177666 A GB 2177666A
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GB
United Kingdom
Prior art keywords
craft
propeller
water
duct
water craft
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.)
Withdrawn
Application number
GB08506821A
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GB8506821D0 (en
Inventor
Oscar Robert Rendell
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 GB08506821A priority Critical patent/GB2177666A/en
Publication of GB8506821D0 publication Critical patent/GB8506821D0/en
Publication of GB2177666A publication Critical patent/GB2177666A/en
Withdrawn legal-status Critical Current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
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/14—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in non-rotating ducts or rings, e.g. adjustable for steering purpose
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
    • F02B61/04—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers
    • F02B61/045—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers for marine engines

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Toys (AREA)

Abstract

A water craft 1 having a longitudinal tunnel 3, below the water line, housing a driven multiple-turn screw propeller 4 on a longitudinal axis for propelling the craft. The screw is preferably multiple-start. The propeller is driven by an outboard motor 8. <IMAGE>

Description

SPECIFICATION Improvements in or relating to propulsion means for water craft Description of the invention This invention relates to water craft and to propulsion means therefor.
The conventional propulsion means for powered water craft is the screw propeller. The present invention provides alternative propulsion means.
Short description of the drawings In order that the invention may be carried into practice, one embodiment will now be described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 is a diagrammatic section on the longitudinal axis of a water craft, showing the power means and propulsion means in side elevation; and Figure 2 is the rear end elevation of the water craft of Figure 1.
Description of the example Referring to the accompanying drawings, a water craft 1 is shown in section in Figure 1 and in end elevation in Figure 2. The water line is shown at 2 in both Figures.
Beneath the craft 1, in this example on the fore and aft axis, is a cylindrical duct 3 housing a propeller 4. The propeller 4 of the example of Figure 1 is a curved blade secured to and wound helically around a drive shaft 5.
The propulsion means may take a number of alternative forms, discussed later herein, but for the present description, it should be noted that the propeller may be a single-start helix, as shown in Figure 1, or a multiple-start helix, as shown in Figure 2.
The drive shaft 5 is carried centrally of the duct 3 by a forward bearing 6 and a rearward bearing 7, shown in Figure 1.
An outboard motor 8 is mounted at the rear of the craft 1 and is provided with the customary vertical drive shaft and housing shown at 9. At the lower end of the housing 9, the drive shaft, shown at 5' in Figure 1, is turned forwardly and is connected by any suitable means, not shown in the drawings, to the propeller drive shaft 5.
The propeller 4 is driven by the motor 8 in the direction which causes rotation of the blade in the sense to take in water at the front of the duct 3 and force it as a jet from the rear, as indicated by the arrows 10 of Figure 1, for forward motion of the craft 1. For rearward motion of the craft 1, the drive shaft 5 is driven in reverse direction by conventional reverse gearing in the drive of the motor 8. The craft 1, in this example, is steered by a conventional rudder, not shown in the drawings.
It is preferred to provide guards at the front and rear of the duct 3, to prevent the intake of debris suspended in the water, during either sense of rotation of the drive shaft 5.
As indicated earlier herein, a number of alternative arrangements of the propulsion means of the invention are possible, besides that of the specific embodiment described. The propeller 4 blade, instead of being continuous between the forward bearing 6 and the rearward bearing 7 may be divided into sections, to provide for one or more intermediate bearings.
Instead of the single axial duct 3 shown in Figure 1, two ducts, one on each side of the axis may be provided. These may then be of shorter length.
The outboard motor, shown in the example of the drawings, is particularly applicable to small craft. Large craft may be provided with an inboard motor. In such case, the drive shaft passes to the exterior of the craft through a watertight bearing.
1. A water craft having a longitudinai duct, below the water line, housing a propeller on a iongitudinal axis, for propelling the craft when the said propeller is driven.
2. A water craft as claimed in Claim 1, in which the propeller is a multiple-turn screw.
3. A water craft as claimed in Claim 2, in which the propeller is a multiple-start screw.
4. A water craft as claimed in any one of the preceding claims, in which the said duct and said propeller extend for at least the major length of the fore-to-aft axis of the craft.
5. A water craft as claimed in any one of the preceding claims, in which the said duct is of circular internal cross-section.
6. A water craft as claimed in any one of the preceding claims, in which the duct is provided with an apertured debris guard at least at its front end.
7. A water craft as claimed in any one of the preceding claims, in which the said propeller is adapted to be driven, by a drive external to the craft.
8. A water craft as claimed in Claim 7, in which the said propeller has a drive from an outboard motor.
9. A water craft as claimed in any one of the preceding claims, in which the said duct and propeller are wholly external to the craft shell.
10. A water craft as claimed in Claim 1, constructed substantially as described herein with reference to the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (10)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Improvements in or relating to propulsion means for water craft Description of the invention This invention relates to water craft and to propulsion means therefor. The conventional propulsion means for powered water craft is the screw propeller. The present invention provides alternative propulsion means. Short description of the drawings In order that the invention may be carried into practice, one embodiment will now be described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 is a diagrammatic section on the longitudinal axis of a water craft, showing the power means and propulsion means in side elevation; and Figure 2 is the rear end elevation of the water craft of Figure 1. Description of the example Referring to the accompanying drawings, a water craft 1 is shown in section in Figure 1 and in end elevation in Figure 2. The water line is shown at 2 in both Figures. Beneath the craft 1, in this example on the fore and aft axis, is a cylindrical duct 3 housing a propeller 4. The propeller 4 of the example of Figure 1 is a curved blade secured to and wound helically around a drive shaft 5. The propulsion means may take a number of alternative forms, discussed later herein, but for the present description, it should be noted that the propeller may be a single-start helix, as shown in Figure 1, or a multiple-start helix, as shown in Figure 2. The drive shaft 5 is carried centrally of the duct 3 by a forward bearing 6 and a rearward bearing 7, shown in Figure 1. An outboard motor 8 is mounted at the rear of the craft 1 and is provided with the customary vertical drive shaft and housing shown at 9. At the lower end of the housing 9, the drive shaft, shown at 5' in Figure 1, is turned forwardly and is connected by any suitable means, not shown in the drawings, to the propeller drive shaft 5. The propeller 4 is driven by the motor 8 in the direction which causes rotation of the blade in the sense to take in water at the front of the duct 3 and force it as a jet from the rear, as indicated by the arrows 10 of Figure 1, for forward motion of the craft 1. For rearward motion of the craft 1, the drive shaft 5 is driven in reverse direction by conventional reverse gearing in the drive of the motor 8. The craft 1, in this example, is steered by a conventional rudder, not shown in the drawings. It is preferred to provide guards at the front and rear of the duct 3, to prevent the intake of debris suspended in the water, during either sense of rotation of the drive shaft 5. As indicated earlier herein, a number of alternative arrangements of the propulsion means of the invention are possible, besides that of the specific embodiment described. The propeller 4 blade, instead of being continuous between the forward bearing 6 and the rearward bearing 7 may be divided into sections, to provide for one or more intermediate bearings. Instead of the single axial duct 3 shown in Figure 1, two ducts, one on each side of the axis may be provided. These may then be of shorter length. The outboard motor, shown in the example of the drawings, is particularly applicable to small craft. Large craft may be provided with an inboard motor. In such case, the drive shaft passes to the exterior of the craft through a watertight bearing. CLAIMS
1. A water craft having a longitudinai duct, below the water line, housing a propeller on a iongitudinal axis, for propelling the craft when the said propeller is driven.
2. A water craft as claimed in Claim 1, in which the propeller is a multiple-turn screw.
3. A water craft as claimed in Claim 2, in which the propeller is a multiple-start screw.
4. A water craft as claimed in any one of the preceding claims, in which the said duct and said propeller extend for at least the major length of the fore-to-aft axis of the craft.
5. A water craft as claimed in any one of the preceding claims, in which the said duct is of circular internal cross-section.
6. A water craft as claimed in any one of the preceding claims, in which the duct is provided with an apertured debris guard at least at its front end.
7. A water craft as claimed in any one of the preceding claims, in which the said propeller is adapted to be driven, by a drive external to the craft.
8. A water craft as claimed in Claim 7, in which the said propeller has a drive from an outboard motor.
9. A water craft as claimed in any one of the preceding claims, in which the said duct and propeller are wholly external to the craft shell.
10. A water craft as claimed in Claim 1, constructed substantially as described herein with reference to the accompanying drawings.
GB08506821A 1985-03-15 1985-03-15 Propulsion means for water craft Withdrawn GB2177666A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08506821A GB2177666A (en) 1985-03-15 1985-03-15 Propulsion means for water craft

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08506821A GB2177666A (en) 1985-03-15 1985-03-15 Propulsion means for water craft

Publications (2)

Publication Number Publication Date
GB8506821D0 GB8506821D0 (en) 1985-04-17
GB2177666A true GB2177666A (en) 1987-01-28

Family

ID=10576079

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08506821A Withdrawn GB2177666A (en) 1985-03-15 1985-03-15 Propulsion means for water craft

Country Status (1)

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GB (1) GB2177666A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999041498A1 (en) * 1998-02-13 1999-08-19 Adolfo Gonzalez Perez Universal hydraulic and wind turbine, and applications

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB371224A (en) * 1931-07-07 1932-04-21 Willman Ielvid Miller Improvements in propellers
GB386913A (en) * 1931-10-23 1933-01-26 Willy Albrecht Improvements in and relating to the propulsion of high-speed ships
GB632499A (en) * 1946-04-10 1949-11-28 Alfred Pace Device for improving the propeller efficiency of ships
GB1033234A (en) * 1963-06-26 1966-06-22 Justinien Marcel Improvements in or relating to a buoyancy device for a surface watercraft
GB1335845A (en) * 1971-05-19 1973-10-31 Mackenzie W Axial screw type marine impeller combining axial flow with centrifugal throw
GB1362694A (en) * 1971-05-13 1974-08-07 White & Co Ltd Samuel Ship retarding system
GB1416531A (en) * 1972-01-14 1975-12-03 Whittle A Hydrofoil craft

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB371224A (en) * 1931-07-07 1932-04-21 Willman Ielvid Miller Improvements in propellers
GB386913A (en) * 1931-10-23 1933-01-26 Willy Albrecht Improvements in and relating to the propulsion of high-speed ships
GB632499A (en) * 1946-04-10 1949-11-28 Alfred Pace Device for improving the propeller efficiency of ships
GB1033234A (en) * 1963-06-26 1966-06-22 Justinien Marcel Improvements in or relating to a buoyancy device for a surface watercraft
GB1362694A (en) * 1971-05-13 1974-08-07 White & Co Ltd Samuel Ship retarding system
GB1335845A (en) * 1971-05-19 1973-10-31 Mackenzie W Axial screw type marine impeller combining axial flow with centrifugal throw
GB1416531A (en) * 1972-01-14 1975-12-03 Whittle A Hydrofoil craft

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999041498A1 (en) * 1998-02-13 1999-08-19 Adolfo Gonzalez Perez Universal hydraulic and wind turbine, and applications
ES2156475A1 (en) * 1998-02-13 2001-06-16 Perez Adolfo Gonzalez Universal hydraulic and wind turbine, and applications

Also Published As

Publication number Publication date
GB8506821D0 (en) 1985-04-17

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)