GB1576818A - Scot jubilee jet propeller - Google Patents

Scot jubilee jet propeller Download PDF

Info

Publication number
GB1576818A
GB1576818A GB5033976A GB5033976A GB1576818A GB 1576818 A GB1576818 A GB 1576818A GB 5033976 A GB5033976 A GB 5033976A GB 5033976 A GB5033976 A GB 5033976A GB 1576818 A GB1576818 A GB 1576818A
Authority
GB
United Kingdom
Prior art keywords
shroud
hub
propeller
blades
diameter
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.)
Expired
Application number
GB5033976A
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 GB5033976A priority Critical patent/GB1576818A/en
Publication of GB1576818A publication Critical patent/GB1576818A/en
Expired legal-status Critical Current

Links

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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

(54) SCOT JUBILEE JET PROPELLER (71) I, JAMES BOWMAN, "Hermione" 11 Milton Place, Pittenweem, Fife, British, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to improvements in propellers mainly for marine purposes although the invention may be applied to aircraft, hovercraft or large volume, low pressure pumping of fluids and in the latter case high pressure can be obtained by having one propeller after another.
According to the present invention, a propeller has a frusto-conical shroud with conical inner and outer surfaces fixed to the blades of the propeller, a hub which in that region where the blades are attached increases in diameter in the direction in which the shroud decreases in diameter, and a boss attached to the hub which projects beyond the shroud at its low diameter end.
A ship makes considerable aeration immediately forward of the propeller which the cone by squeezing turns this soft water into more solid water. Further into the cone the blades and hub squeeze the water firmer still and thrust it aft. However in the region of the blades, a vacuum factor develops on conventional propellers which is overcome in the present invention by the increasing diameter of the hub together with the decreasing diameter of the shroud so that the vacuum area becomes a pressure area. The boss extending clear of the shroud may be constructed and streamlined as is most suitable. The boss in a large deep-drafted ship may be fitted with a non-return air pressure valve.
The invention is more particularly described with reference to the accompanying drawing of a sectional elevation through the propeller.
In the drawing a propeller with a hub 1 has blades 2 which are connected to a shroud 3 which is of frusto-conical shape with conical inner and outer surfaces. The hub 1 is extended outside of the shroud by a boss 4. It can be seen that the radius of the hub increases continuously in the region denoted by lines AA where the blades are connected to the hub by an amount "d" and in the direction in which the diameter of the shroud is decreasing. The maximum and minimum diameters of the shroud are 28 and 25 inches respectively. The length is 7 inches making an angle of 18 which is considered to give maximum efficiency.
The boss is hollow and defines with its walls and sealing plate 5 a chamber 6 wherein air can be pressurised by way of a nonreturn air pressure valve 7.
WHAT I CLAIM IS: 1. A propeller comprising a frustoconical shroud with conical inner and outer surfaces fixed to the blades of the propeller, a hub which in that region where the blades are attached increases in diameter in the direction in which the shroud decreases in diameter and a boss attached to the hub which projects beyond the shroud at its low diameter end.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (1)

  1. **WARNING** start of CLMS field may overlap end of DESC **.
    (54) SCOT JUBILEE JET PROPELLER (71) I, JAMES BOWMAN, "Hermione" 11 Milton Place, Pittenweem, Fife, British, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to improvements in propellers mainly for marine purposes although the invention may be applied to aircraft, hovercraft or large volume, low pressure pumping of fluids and in the latter case high pressure can be obtained by having one propeller after another.
    According to the present invention, a propeller has a frusto-conical shroud with conical inner and outer surfaces fixed to the blades of the propeller, a hub which in that region where the blades are attached increases in diameter in the direction in which the shroud decreases in diameter, and a boss attached to the hub which projects beyond the shroud at its low diameter end.
    A ship makes considerable aeration immediately forward of the propeller which the cone by squeezing turns this soft water into more solid water. Further into the cone the blades and hub squeeze the water firmer still and thrust it aft. However in the region of the blades, a vacuum factor develops on conventional propellers which is overcome in the present invention by the increasing diameter of the hub together with the decreasing diameter of the shroud so that the vacuum area becomes a pressure area. The boss extending clear of the shroud may be constructed and streamlined as is most suitable. The boss in a large deep-drafted ship may be fitted with a non-return air pressure valve.
    The invention is more particularly described with reference to the accompanying drawing of a sectional elevation through the propeller.
    In the drawing a propeller with a hub 1 has blades 2 which are connected to a shroud 3 which is of frusto-conical shape with conical inner and outer surfaces. The hub 1 is extended outside of the shroud by a boss 4. It can be seen that the radius of the hub increases continuously in the region denoted by lines AA where the blades are connected to the hub by an amount "d" and in the direction in which the diameter of the shroud is decreasing. The maximum and minimum diameters of the shroud are 28 and 25 inches respectively. The length is 7 inches making an angle of 18 which is considered to give maximum efficiency.
    The boss is hollow and defines with its walls and sealing plate 5 a chamber 6 wherein air can be pressurised by way of a nonreturn air pressure valve 7.
    WHAT I CLAIM IS:
    1. A propeller comprising a frustoconical shroud with conical inner and outer surfaces fixed to the blades of the propeller, a hub which in that region where the blades are attached increases in diameter in the direction in which the shroud decreases in diameter and a boss attached to the hub which projects beyond the shroud at its low diameter end.
GB5033976A 1977-11-28 1977-11-28 Scot jubilee jet propeller Expired GB1576818A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5033976A GB1576818A (en) 1977-11-28 1977-11-28 Scot jubilee jet propeller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5033976A GB1576818A (en) 1977-11-28 1977-11-28 Scot jubilee jet propeller

Publications (1)

Publication Number Publication Date
GB1576818A true GB1576818A (en) 1980-10-15

Family

ID=10455548

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5033976A Expired GB1576818A (en) 1977-11-28 1977-11-28 Scot jubilee jet propeller

Country Status (1)

Country Link
GB (1) GB1576818A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4413947A (en) * 1980-10-24 1983-11-08 Nissan Motor Company, Limited Fan arrangement
WO2004020278A1 (en) * 2002-08-30 2004-03-11 Romero Vazquez Juan Jose Propeller, propeller propulsion system and vessel comprising propulsion system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4413947A (en) * 1980-10-24 1983-11-08 Nissan Motor Company, Limited Fan arrangement
WO2004020278A1 (en) * 2002-08-30 2004-03-11 Romero Vazquez Juan Jose Propeller, propeller propulsion system and vessel comprising propulsion system
WO2004020280A1 (en) * 2002-08-30 2004-03-11 Romero Vazquez Juan Jose Propeller, propeller propulsion system and vessel comprising propulsion system
ES2249072A1 (en) * 2002-08-30 2006-03-16 Juan Jose Romero Vazquez Propeller, propeller propulsion system and vessel comprising propulsion system

Similar Documents

Publication Publication Date Title
US2426742A (en) Screw propeller
US4331429A (en) Symmetrical propeller
US4586873A (en) Mixer-ejector with jet effect and variable cross-section
US4832570A (en) Boat propeller having counter-rotating screws and provided with a nozzle
US3611966A (en) Submersible vehicle with multiple tubular ring hull
US9914515B1 (en) Barrel extension assemblies and methods for marine propellers
GB1163549A (en) Propellers for Marine Vessels, Land Vehicles and Aircraft
GB1576818A (en) Scot jubilee jet propeller
CN109050853B (en) Marine detachable ducted propeller
US4381901A (en) Anti-cavitation marine propeller
KR940001622B1 (en) Screw propellor for ship
US4969413A (en) Sea- or drag-anchor
US5213525A (en) Jacketed marine propeller
ITGE20110036A1 (en) INTUBATED NAVAL PROPELLER
EP0609389A1 (en) An elastomeric propeller having a flexible elastomeric covering
CN211810169U (en) Take screw device of defoaming function
CN211901014U (en) Centrifugal through-flow water navigation body propulsion device and application equipment
CN208530820U (en) A kind of stern dynamic structural of ship
US1267506A (en) Propeller device.
CN221214534U (en) Propeller capable of reducing cavitation noise
RU214386U1 (en) Boat propeller nozzle
US1015540A (en) Screw-propeller.
RU2213677C2 (en) Water-jet propeller for submarine vessel
EP0056508A1 (en) A method of and apparatus for increasing the thrust produced by a fluid jet discharging from a pipe
SU488754A1 (en) Water jet

Legal Events

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