US2909143A

US2909143A - Rudder

Info

Publication number: US2909143A
Application number: US669768A
Authority: US
Inventors: Tavares Everett Alfred
Original assignee: Individual
Current assignee: Individual
Priority date: 1957-07-03
Filing date: 1957-07-03
Publication date: 1959-10-20
Anticipated expiration: 1976-10-20

Description

Oct. 20, 1959 E. A. TAIVAREIS' RUDDER Filed July 3, 1957 ATTCIRNEYS United States Patent RUDDER Everett Alfred Tavares, San Leandro, Calif.

Application July 3, 1957, Serial No. 669,768

'1 Claim. (Cl. 114-166) This invention relates to a ship, and more particularly to an improved rudder for a ship.

The object of the invention is to provide a ship rudder which is constructed so that drag and friction will be reduced whereby the ship can travel faster and more efficiently.

Another object of the invention is to provide a ship rudder which is provided with a longitudinally extending passageway so that turbulent water which is churned up by the ships propeller will pass through the passageway whereby there will be a minimum amount of drag or friction or resistance so that the propeller can operate at maximum efliciency whereby the ship will be able to travel faster or more efiiciently, for a given speed of the propeller.

A further object of the invention is to provide a ship rudder which is extremely simple and inexpensive to manufacture.

Other objects and advantages will be apparent during the course of the following description.

In the accompanying drawings, forming a part of this application, and in which like numerals are used to designate like parts throughout the same Figure 1 is a side elevational view of the rudder of the present invention, with parts broken away and in section.

Figure 2 is an end elevational view of the rudder.

Figure 3 is a sectional view taken on the line 3-3 of Figure 1.

Referring in detail to the drawings, the numeral indicates the ship rudder of the present invention, and there is provided an upright member 11 which has a body member 12 on the lower end thereof, Figure 1.

The body member 12 is provided with an elongated substantially horizontally disposed longitudinally extending bore or passageway which is indicated generally by the numeral 13. The passageway 13 has a tapered or flaring shape so that the front portion 14 is of slightly greater area and is more nearly round than the portion 15.

As shown in Figure 2, the side portions of the body member 12 are rounded or curved as indicated by the numeral 16. Depending from the lower front portion of the body member 12 and secured thereto or formed integral therewith is a lug 17. The lower rear portion of the body member 12 terminates in a tapered portion or arm 18. The bottom portion 20 of the rudder is provided with ribs 19, for example, as shown in Figures 1 and 2.

From the foregoing, it is apparent that there has been provided a rudder which is adapted to be used on a ship, and in use the rudder 10 may have its upstanding portion or shank 11 connected to the usual mechanism on the ship. The rudder 10 is adapted to be arranged rearwardly of the usual ship propeller, so that as the propeller churns in the water, the turbulent water will pass through the passageway 13 so that the turbulent water will not impinge against a solid rudder as is the case with conventional rudders. Thus, the turbulent water will be able to move through the passageway 13 so that there will be ice a minimum amount of frictional resistance between the turbulent water and the rudder so that there will be a. minimum amount of drag on movement of the vessel or ship. The passageway 13 is constructed so that the front portion 14 is of slightly greater area than the rear portion 15 to act as or definea flaring mouth or funnel whereby the turbulent Water will be guided into and compressed in passageway 13. Furthermore, by having the rear end 15 of slightly reduced size, the water which issues from the rear of the passageway 13 will issue in the form of a jet which will have a tendency to provide increased propulsion so that the water issuing from the rear end 15 of the passageway 13 will have a tendency to help propel the ship forwardly.

Furthermore, the rudder 10 is constructed so that it includes the rounded side 16 and the tapered portion 18 and this construction provides a streamlined effect which helps minimize resistance or drag as the rudder moves through the water.

The rudder of the present invention is adapted to be used in lieu of the conventional rudders now in use on ships, and the rudder 10 is constructed so that drag in the front portion of the rudder will be reduced whereby water turbulence will be able to effectively pass through the opening or passageway 13 with the minimum amount of friction and resistance. This permits the vessel or ship to travel at faster speeds for a given r.p.m. Furthermore, the turning surfaces are doubled and this permits the turning potential to be increased and at the same time serves to appreciably eliminate the drop in speed due to rapid turns. Furthermore, the turning area is also reduced since the jet of water issuing through the rear end 15 of the passageway serves to push the stern about a smaller axis due to the relocation of the expanding turbulent area at the rear of the rudder.

The lug 17 serves as a means of fastening the lower portion of the rudder to an under bracing of the ship for greater security and it is substantially parallel to the shaft in portion 11. The tapered end 18 offers a streamlined effect and creates eddy currents adjacent the portion 15 which makes this area less dense at faster speeds and allows increased efficiency. The rib 19 serves as further stabilization and balance as well as adding weight to the lower portion of the rudder.

While I have shown a preferred form of my invention, I reserve all rights to such modifications as properly fall within the scope of the invention as claimed.

I claim:

In a rudder, an upright member, a body member on the lower end of said upright member, said body member being provided with a longitudinally extending passageway therein, said passageway having a tapered shape so that the front portion thereof is of slightly greater size than the rear portion thereof, the sides of said body member being shaped arcuately, a tapered end portion projecting rearwardly from the lower end of the rudder, and stabilizing ribs on said body member in alinement with the tapered end portion at the lower end of the rudder.

References Cited in the file of this patent UNITED STATES PATENTS 99,639 Coleman Feb. 8, 1870 779,961 Nicholson Ian. 10, 1905 1,800,135 Corcoran Apr. 7, 1931 2,154,321 Briggs Apr. 11, 1939 2,803,211 Erlbacher Aug. 20, 1957 FOREIGN PATENTS 2,104 Great Britain of 1866