GB2264983A - Propeller to delay the onset of cavitation. - Google Patents

Propeller to delay the onset of cavitation. Download PDF

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Publication number
GB2264983A
GB2264983A GB9204544A GB9204544A GB2264983A GB 2264983 A GB2264983 A GB 2264983A GB 9204544 A GB9204544 A GB 9204544A GB 9204544 A GB9204544 A GB 9204544A GB 2264983 A GB2264983 A GB 2264983A
Authority
GB
United Kingdom
Prior art keywords
propeller
blades
cavitation
onset
delay
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Withdrawn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
GB9204544A
Other versions
GB9204544D0 (en
Inventor
Nathan Aldred Wright
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 GB9204544A priority Critical patent/GB2264983A/en
Publication of GB9204544D0 publication Critical patent/GB9204544D0/en
Publication of GB2264983A publication Critical patent/GB2264983A/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Withdrawn legal-status Critical Current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
    • B63H1/00—Propulsive elements directly acting on water
    • B63H1/02—Propulsive elements directly acting on water of rotary type
    • B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
    • B63H1/14—Propellers
    • B63H1/16—Propellers having a shrouding ring attached to blades

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)

Abstract

The propeller has no central hub, so that the onset of cavitation is delayed. The blades 4 are joined to the supporting/ drive ring 6 by any suitable means. There may be any number of blades, and the assembly may be held in place by any means that are applicable. The blades must be of such a shape that lift forces are produced when the arrangement is rotated in direction 7 or 8. The propeller may be mounted on a ship (Fig. 1). <IMAGE>

Description

PROPELLER TO DELAY THE ONSET OF CAVITATION This invention is a propeller that is to propel a vehicle through a fluid or on the interface of two fluids.
Propellers are a common form of propelling a ship, submarine or some other vehicle such as a hovercraft.
Most propellers have the blades attached to a central hub which rotates and thus causes the blades to rotate. The shape of the blades causes a pressure difference on them, due to the rotation, and thus a force is developed on the blades. The propeller then moves in the direction of this force on the blades.
However, propellers that operate in water are prone to a phenomenon known as cavitation. This is a form of local boiling which reduces the efficiency of the propeller and can cause damage to the blades. This effect is strongly linked with the size of the joint of the blades and the hub.
According to the present invention there is a rigid ring onto which any type of lifting blade may be joined by any suitable means. The blades, of which there may be any number, must not touch one another at any point, except possibly at the intersection with the supporting ring.
The blades may overlap but the arrangement must have no central hub.
An example of the use of this invention will now be described, with reference to the accompanying drawing in which:- Figure 1 shows how such a propeller could be installed Figure 2 shows such a propeller in detail.
In the drawing it can be seen that the propeller is housed in a cowling 1 which is fixed to the hull 2 by struts 3.
It is possible that the drive for the propeller could be provided by a chain that is passed through a pair of the struts and onto the supporting ring.
The propeller is of a four blade type in which the blades 4, which are of any type that would provide lift when the supporting ring is rotated in the direction 7 or 8, are attached to the supporting ring 6. When the propeller is rotated in either of the aforementioned directions the hull will move due to the forces, (lift), generated on the blades.

Claims (3)

1. A propeller with no central hub comprising of a number of lifting blades joined to an outer ring.
2. A propeller with no central hub as claimed in Claim 1, with the blades joined to the outer ring by a means that allows the pitch of the blades to be altered.
3. A propeller with no central hub as claimed in Claim 1, with the blades joined to the outer ring by a means that does not allow the pitch of the blades to be altered.
GB9204544A 1992-03-03 1992-03-03 Propeller to delay the onset of cavitation. Withdrawn GB2264983A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9204544A GB2264983A (en) 1992-03-03 1992-03-03 Propeller to delay the onset of cavitation.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9204544A GB2264983A (en) 1992-03-03 1992-03-03 Propeller to delay the onset of cavitation.

Publications (2)

Publication Number Publication Date
GB9204544D0 GB9204544D0 (en) 1992-04-15
GB2264983A true GB2264983A (en) 1993-09-15

Family

ID=10711383

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9204544A Withdrawn GB2264983A (en) 1992-03-03 1992-03-03 Propeller to delay the onset of cavitation.

Country Status (1)

Country Link
GB (1) GB2264983A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9011100B2 (en) 2012-09-12 2015-04-21 Mehmet Nevres ULGEN Demountable propeller
RU2673932C1 (en) * 2017-09-18 2018-12-03 Солас Сайенс Энд Энджиниринг Ко., Лтд. Marine propulsive plant
RU2770259C1 (en) * 2021-07-28 2022-04-14 Владимир Михайлович Анфалов Electric water jet

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB514242A (en) * 1938-04-06 1939-11-02 Henry Weissman Improved shaftless screw propeller
GB750274A (en) * 1954-07-05 1956-06-13 Eugenio Marcon Propelling ships or boats
GB1165970A (en) * 1966-04-04 1969-10-01 Walter G Finch A Vessel for Undersea Use
US3918389A (en) * 1974-11-26 1975-11-11 Kiyoshi Shima Marine steering and propulsion device
GB1447512A (en) * 1973-01-23 1976-08-25 Tec Group Bladed fluid flow machine rotor
US4242979A (en) * 1977-11-09 1981-01-06 Kiyoshi Shima Screw propeller with no shaft boss and ship thruster using such screw propeller
US4648788A (en) * 1984-01-26 1987-03-10 Philip Jochum Device in fluid pressure generators
GB2235254A (en) * 1989-06-02 1991-02-27 John C Ross Multi-bladed propulsion apparatus

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB514242A (en) * 1938-04-06 1939-11-02 Henry Weissman Improved shaftless screw propeller
GB750274A (en) * 1954-07-05 1956-06-13 Eugenio Marcon Propelling ships or boats
GB1165970A (en) * 1966-04-04 1969-10-01 Walter G Finch A Vessel for Undersea Use
GB1447512A (en) * 1973-01-23 1976-08-25 Tec Group Bladed fluid flow machine rotor
US3918389A (en) * 1974-11-26 1975-11-11 Kiyoshi Shima Marine steering and propulsion device
US4242979A (en) * 1977-11-09 1981-01-06 Kiyoshi Shima Screw propeller with no shaft boss and ship thruster using such screw propeller
US4648788A (en) * 1984-01-26 1987-03-10 Philip Jochum Device in fluid pressure generators
GB2235254A (en) * 1989-06-02 1991-02-27 John C Ross Multi-bladed propulsion apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9011100B2 (en) 2012-09-12 2015-04-21 Mehmet Nevres ULGEN Demountable propeller
RU2673932C1 (en) * 2017-09-18 2018-12-03 Солас Сайенс Энд Энджиниринг Ко., Лтд. Marine propulsive plant
RU2770259C1 (en) * 2021-07-28 2022-04-14 Владимир Михайлович Анфалов Electric water jet

Also Published As

Publication number Publication date
GB9204544D0 (en) 1992-04-15

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Legal Events

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