US1642163A - Device for reducing the pitching of ships - Google Patents

Device for reducing the pitching of ships Download PDF

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Publication number
US1642163A
US1642163A US147211A US14721126A US1642163A US 1642163 A US1642163 A US 1642163A US 147211 A US147211 A US 147211A US 14721126 A US14721126 A US 14721126A US 1642163 A US1642163 A US 1642163A
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Prior art keywords
pitching
ships
guide members
reducing
plates
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Expired - Lifetime
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US147211A
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Lucke Hermann Friedric Wilhelm
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
    • B63B39/06—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water
    • 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
    • B63H5/16—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in recesses; with stationary water-guiding elements; Means to prevent fouling of the propeller, e.g. guards, cages or screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
    • B63B39/06—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water
    • B63B2039/067—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water effecting motion dampening by means of fixed or movable resistance bodies, e.g. by bilge keels

Definitions

  • This invention relates to a device for reducing the pitching of ships and has for 1ts object to reduce pitching, especially 1n the case of ships travelling under ballast, 1n such a manner that the annoying movement of the propeller out of the water is eliminated during pitching and an idle runnlng of the propeller is obviated.
  • rotary plates have been arranged outside the hull of the ship, these plates being adapted to be brought into their operative position by an extremely complicated device.
  • guide members are arranged on both sides of the rear stem of the vessel, these members extending close up to the propeller blades.
  • the guide members are provided with openings located near the hull of the ship. For the purpose of removing the load of surface pressure further openings of suitable shape are provided.
  • Figure 1 is an elevation of the rear stem of a ship with a guide member consisting of a plate.
  • Figure 2 is an elevation of the rear stem with a guide body composed of a number of plates fitted together in the form of a hollow body.
  • Figure 3 is a plan of the rear stem.
  • Figure 4 is a plan of a guide member consisting of a plate.
  • Figure 5 is a view of the interior of a guide member composed of a number of plates
  • Figure 6 is a section on-the line AB of Figure 5.
  • the guide members may be composed of single plates or of a number of plates in which latter case the plates are fitted together so as to form a hollow body.
  • the guide members a are of such a shape that they extend as close as possible to the propeller blades 6.
  • openings 0 which are arranged near the hull of the ship.
  • the guide members are also provided with openin 's Ii. providing such guide members the pitching of the ship, even when travelling under ballast, is considerably reduced as the guide members oppose a considerable resistance to pitching.

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  • 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

Sept. 13, 1927.
H. F. w. LUCKE DEVICE FOR REDUCING THE PITCHING 0F SHIPS Filed Nov. 9. 1926 Fi Z.
e m W T y. NM
Patented Sept. 13,1927.
UNITED sTATEs PATENT OFFICE.
DEVICE. FOR REDUCING THE IITCHIN G OF SHIPS.
Application filed November 9, 1926, Serial No. 147,211, and in Germany July 29, 1926.
This invention relates to a device for reducing the pitching of ships and has for 1ts object to reduce pitching, especially 1n the case of ships travelling under ballast, 1n such a manner that the annoying movement of the propeller out of the water is eliminated during pitching and an idle runnlng of the propeller is obviated.
Endeavours have been made to overcome this drawback by various means but as the means employed were mostly too complicated or did not fulfill their purpose, they were abandoned.
For example rotary plates have been arranged outside the hull of the ship, these plates being adapted to be brought into their operative position by an extremely complicated device.
According to the present invention guide members are arranged on both sides of the rear stem of the vessel, these members extending close up to the propeller blades. In order to enable a balance of the suction action above and below the guide members to be obtained more easily, the guide members are provided with openings located near the hull of the ship. For the purpose of removing the load of surface pressure further openings of suitable shape are provided.
In the accompanyin trated two examples of subject of the invention.
Figure 1 is an elevation of the rear stem of a ship with a guide member consisting of a plate.
Figure 2 is an elevation of the rear stem with a guide body composed of a number of plates fitted together in the form of a hollow body.
Figure 3 is a plan of the rear stem.
drawing are illusconstruction of the Figure 4 is a plan of a guide member consisting of a plate.
Figure 5 is a view of the interior of a guide member composed of a number of plates, and
Figure 6 is a section on-the line AB of Figure 5.
t the rear stem of the ship stationary guide members a are provided on each side thereof. The guide members may be composed of single plates or of a number of plates in which latter case the plates are fitted together so as to form a hollow body. The guide members a are of such a shape that they extend as close as possible to the propeller blades 6. In order to obtain a satisfactory balance of the suction above and below the guide members at these latter are provided with openings 0 which are arranged near the hull of the ship. In order to remove the load of surface ressure the guide members are also provided with openin 's Ii. providing such guide members the pitching of the ship, even when travelling under ballast, is considerably reduced as the guide members oppose a considerable resistance to pitching.
Having thus described my invention what I claim as new and desire to secure by Letters Patent is A device for reducing the pitching of ships, wherein stationary guide members are provided on both sides of the rear of the s ip and extend close up to the propeller blades and wherein the guide members consist each of a number of plates which are formed into a hollow body.
In testimony whereof I have afiixed my.
signature.
HERMANN FRIEDRICH WILHELM LUCKE.
US147211A 1926-07-29 1926-11-09 Device for reducing the pitching of ships Expired - Lifetime US1642163A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1642163X 1926-07-29

Publications (1)

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US1642163A true US1642163A (en) 1927-09-13

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