US1991512A - Boat - Google Patents

Description

R. W. MILLER Feb. 19, 1935.

l BOAT Filed Feb. 2; 1984 Patented Feb. 19, 19 35' UNITED *STATES PATENT OFFICE This invention relates to hoats, and an object is to provide an improved construction and arrangement of power driven'propelling mechanism forboats of any size from toys to full sized 5 craft.

This and other objects which will be apparent to those skilled in this particular art are accomplished by means of the invention illustrated in the accompanying drawing, in which,

Pig. 1 is a tic plan view illustrative of one embodiment of this invention; i

Fig. 2 is a diagrammatic side elevation of the features shown in Fig. 1; and

Pig. 3 is an end elevation of the stem of the boat illustrated in Figs. 1 and 2.

As illustrated in the accompanying 'drawing} the a invention is shown in connection with a hull 5 of any standard form of construction. Any suitable source'of power 6 such as an internal combustion engine, orv the like,l is adapted to drive the usual propeller '1 securedto a propeller shaft `8 which is driven through a suitable transmission 9.

On each side ofthe hull 5 a casing 10 is mounted preferably at about 'the level of the water line or slighly below, and the casing may extend downwardiy along the sides of the hull to any desired extent. The casing 10 is arranged so as to providera water e 11 having a water intake openingmattheforwardendofeachpassage on opposite sides of the hull. The passages 11 extendaroimdthesternofthehull where they upon the propeller 7 and the casing is so arranged that a discharge passage 13thepropeller7andformsineifect a continuation of the es 11 so that the propeller '1 is effective upon water iiowing'rearwardly through the es 11 and drives the same outwar'dly through the dischargeoutlet 13. In the illustrated embodiment of the "invention, an auxlliary propeller 14 is located in 'each water men forward Of fllt mneller 7- 'The '111xiliaryilmlleul' shafts 15 are driven from-the 9. The effect of the auxillary propellers is to draw water through the passage 11 anddrive it with considerable force to .the propeller '1 in the discharge outlet 13.

It will be noted that the casing 10, as illustrated, extends 'conslderably to the rear of the, hull 5 and constitutes an additional load overhanging the stem. vIn order to prevent this load' from increasing the vdraft of the hull, an airw tight tank 16 is formed acrossjthe upper portion 'of the extended casing to increase the buoyancy thereof.

In operation, water is drawn into the passageways 11 on each side of the hull and is forced rearwardly by the propellers 14 to the propeller 7 which discharges it through the discharge outlet 13. The size and length of the-passages 11 can be varied and the'arrangement of propellers can also be changed or modified in any practiceble manner. Sultable valves, not shown, may obviouslybe employed to shut water out of the passages 11 and 13 when repairs are necessary, and grilles 17 or the like will be suitable at the inlets 12 to prevent extraneous materials,.such as wood or the like, from entering the passages and damaging the propellers or other parts.

It will be apparent that the invention can be variously modifled or adapted within the scope of the appended claim.

I claim:

The combination with a boat hull and a con- 30 ventionally arranged propeller of a casing located outside of said hull and cooperating with the outer face of saidwhull to form a compartment enclosing the said propeller and providing. a discharge outlet astern of said propeller and a 3 water-containing chamber forward of said, propeller, inlets to said compartments on opposite sides of said hull, and means for forcing water from said inlets into said chamber so as to maintain a pressure of water'in said chamber against said propeller to permit effective operation of said propeller at high speed and prevent the formation of a vacuum thereby.

BUDOLPH W. MILLER..

Images