US2519793A - Boat - Google Patents

Description

A. J. ROWE Aug. 22, 1950 BOAT Filed Dec. 16, 1947 INVENTOR. 6255/?7' Jf/Vaws g flfra Patented Aug. 22, 1950 U N l T ED S TATES PATENT OF 1 K111.

BOAT

Albert J. RoWe,'WestIs1ip, N. '.Y

ApplicationDecember 16, 1947, Serial No. 791,964

2 Claims.

This invention relates to the hulls of boats and has special references to the design of aboat bottom for moderate and high speedboats.

One object of the invention is to provide a 'boat bottom that will enable the boat to ridelevel on a minimum of wetted surface and therefore attaining the maximum speed for the amount of horse power used.

Another object of the invention is that it can be applied to flat, round, semi-round, concave or V bottom hulls. The invention will attain maximum efficiency in a V bottom, the reason for which will be explained later.

It is my theory that objects moving through water and objects moving through air encounter resistances and these resistance are fundamentally identical except for the differences in their densities.

At around 760 M. P. H. air speed you get into what is known as compressability which means that the air builds up like a solid wall in front of an airplane. Water has 40 times the density as air, so when you divide 4.0 into 760 you get 19. Therefore I believe that at speeds above 19 M. P. H. an object moving through the water encounters resistances equal to the ccmpressability encountered by aircraft moving at speeds at 760 M. P. H.

In order to get over this state in air, science has found that you have to go from standard rounded air foils to knife edges (this is where the V bottom works out naturally best because it is knifed from the bow aft) and instead of straight frontal areas on wings and elevators, a 45 degree sweep back is best. Thi enables the plane to knife through the air in stages instead of bucking the whole frontal area at once, thereby enabling the lan to get through the compressability stage.

To attain high speeds in boats the boat bottom must ride on the extreme surface of the water because the deeper it rides in the water the more compressability or resistance it encounters. With my invention the boat bottom lifts itself to the extreme surface and with the 45 degree sweep back it knifes through any compressability or resistance it encounters the same as modern supersonic aircraft.

With the above facts in mind my invention will enable a boat to: 1. Plane faster. 2. Go the same speed with less power than needed by conventional boats. 3. Go 25% faster than conventional boats with equal power. 4. Ride on the extreme surface of the water. 5. Ride level.

6. Ride dry at high speeds in rough water.

7. Handle well at any speed.

The means by which this invention enables a boat to attain the above claims are:

1. Plane faster because the stern lifts itself as a result of the forward motion of the boat against (ill the raised stern bottom surface .at 12 to 15 M.-P.H.

v2. .At higher speeds the wetted area is greatly reduced and the-enginepower is utilized-for for- Ward motion instead .Oif pushing "a lot of boat through solid water.

Following isadesoription of the invention with reference to 'accompanying drawing showing in Figure 1 aside-elevation and LinFigure 2a bottom plan view of the boat, with Figures 3, 4, 5 and 6 showing diagrammatically the chine lines in relation to bottom lines on the planes indicated by lines A, B, C and D in Figures 1 and 2.

Figure 1 is a side view and Figure 2 is a bottom View. In Figures 1 and 2 the area between stations A and B is the riding area at high speed. In Figure 1 the dotted lines marked W. L. are the water lines. The upper line is when the boat is at rest. The lower line is the riding position at high speed.

In Figure 2 the area between stations B and C is where the 45 degree lifting area ends and starts. Figure 1 between stations C and D show where a slight reentrant curve is. This frees the hull at high speed and permits it to ride clear of the water from station B all the way forward. In Figure 2 between stations A and B from the high part of the lifting riding area. at the keel line, the bottom blends into the straight chine line of the boat.

In Figure 3 are shown the chine lines in relation to the bottom lines. D and A and B are the same at the keel and A and B both are on the same plane at the chine and keel while C is higher at the keel due to the reentrant curve shown in Figure 1 between stations 0 and D, but blends into the chine line.

Having explained the object of my invention and described its preferred form, it will be seen that the invention will accomplish the following:

1. A boat will be ride level using my invention.

2. Enable a boat to ride on a minimum of wetted surface.

3. To attain more speed for the amount of horse power used.

4. Simplicity of construction.

5. Maintain planing ability despite severe loads.

6. Attain planing position quickly and at lower speeds.

7. Maintain perfect maneuverability and stability at all speeds.

8. By riding high and level, the boat is dry in choppy water.

What I claim is:

1. A quick lifting, low resistance, self-stabilizing, level riding hull of the speed boat type having a bottom with a smooth, non-bulging planing surface at the extreme stern section, of short forward extent, approximately less than onethird the water line length, and composed of substantially horizontal extending, flat riding planes at opposite sides of and joined at the keel line on a slight dihedral angle and joined with the midship, forwardly extending section by substantially 45 angle sweepbacks, smoothly blending said forwardly extending section into the dihedral of the planing section without protrusion and thereby affording knifing and lifting area leading on slightl downward incline smoothly and continuously into the level riding area afforded by said flat, dihedral planes.

2. A quick lifting, low resistance, self-stabilizing, level riding hull of the speed boat type having a bottom with a smooth, non-bulging planing surface at the extreme stern section, of short forward extent, approximately less than one-third the water line length, and composed of substantially horizontal extending, fiat riding planes at opposite sides of and joined at the keel line on a slight dihedral angle and joined with the midship, forwardly extending section by substantially 45 angle sweepbacks, smoothly blending said forwardly extending section into the dihedral of the planing section without protrusion and thereby affording knifing and lifting area leading on slightly downward incline smoothly and continuously into the level riding area afforded by said flat, dihedral planes, and said bottom forward of said sweepbacks having slightly reentrant curved surfaces smoothly merged into said sweepbacks.

ALBERT J. ROWE.

REFERENCES CITED UNITED STATES PATENTS Number Name Date 1,042,636 Apel Oct. 29, 1912 1,189,227 Baker July 4, 1916 1,797,252 Wallman Mar. 24, 1931 1,880,366 Smedley Oct. 4, 1932 2,369,633 Higgins Feb. 13, 1945 FOREIGN PATENTS Number Country Date 515,361 France Nov. 25, 1920

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