US2044771A - Boat construction - Google Patents

Description

June 23, 1936.

M. D. cAR JR BOAT CONSTRUCTION Filed Sept. 11, 1954 2 Sheets-Sheet l wimp 12 421 a,:

NvENT OR ATTbRNEX June 23, 1936. M. D. CARR. JR BOAT CONSTRUCTION Filed Sept. 11, 1954 2 Sheets-Sheet 2 ATTORN EY Patented June 23, 1936 UNITE. ST'E'ES FATE 3 Claims.

The invention relates to a boat construction and more especially to a boat bottom.

, The primary object of the invention is the provision of a bottom of this character, wherein there are arranged planing surfaces, these being peculiarly disposed so that the bottom will present a flat bow terminating in a deep V at some point toward the stern, then a reverse V raising toward the. stern, while longitudinal steps are provided having inclines directed upwardly and inwardly toward thelreel and the V andreverse V formations are the center of gravity,andbuoyancy, the reverse formation functioning asan air compression chamber, compressing the air that is sucked into it by partial vacuum createdby the V formation as theboat'moves forward, so that stabilization is assured and water resistance relieved to a minimum. Thus aboat level is had and the stern of the said boat will be prevented from squatting or dragging through the water, while bow wavesare eliminated.

Another, object of the invention is the provisionof a bottom .cf this character, wherein the travel of the boat will be smooth and maximum speed may be attained witha minimum of water resistance and automatic stabilizing assured, the faster the travel of the boat the greater the air compression and thus sustaining the boat from stern squatting or dragging, and since there are nobowtwaves the chine line becomes the water line and the displaced Water at the keel falls diagonally toward the chine, thus compressing air and maintaining buoyancy at a center of gravity.

A; fur therpbiectof the invention is the provision of a bottom of this character which is simple in its construction, novel in form, reliable and efficient in the functioning thereof, and inexpensive to manufacture and install.

With these and other objects in view, the invention consists in the features of construction, combination and arrangement of parts as will be hereinafter more fully described in detail, illustrated in the accompanying drawings, which disclose the preferred embodiment of the invention, and pointed out in the claims hereunto appended.

In the accompanying drawings:

Figure 1 is a bottom plan view of a boat bottom constructed in accordance with the invention.

Figure 2 is a side elevation thereof.

Figure 3 is a view looking toward the stern and the hull or body of the boat being partly in section.

Figure 4 is a bottom plan view of a modified form of boat bottom.

Figure 5 is a side elevation thereof.

Figure 6 is a view lookingtoward the stern, the same being partly in section and partly broken away.

Similar reference characters indicate corre sponding parts throughout the several views in the drawings.

Referring to the drawings in detail, particularly Figures 1 to 3 inclusive, there isshown the preferred embodiment of the invention and the boat hull or body is designated generally at A, while the bottom B isthe present invention and will be hereinafter fully described.

The bottom B has starting at the bow' flat and terminating at the stern fiat the alternatelyarranged V and reverse V formation areas; Ni, ii, l2 and H3, respectively, while built in, the areas Hi and [2 are the longitudinal steps it, each step having an incline upward from the front edge to the back edge or a tilt up toward the keel. On i each side of the bo-atchine from a slight distance forwardly of the reverse V formation area H to the stern is an air retainer l5, this being extended down below the bottom of the chine. The V formation area ill is gradually inclined in a rearward direction and likewise the area I? is gradually inclined in" a rearward direction, while the reverse V formation areas H and it are inclined toward the stern and provide air domes immediately rearwardlyof the areas ill and i2. Thus it will be seen that on the forward travel of the boat, at the rear end of each area l6 and i2 and at the beginningof the areas H and 63, a suction iscreated, causing air to be deposited in the-air domes constituted by the areas I l and i3, the air being caught between the hull and the water, the bow of the hull being caused to rise out of the water during the forward propelling of the boat and at the area II) the air caught between the hull and the water is conveyed by the steps [4 toward the stern, this causing a partial air action between the areas Ill and I2 and the water and such air in the air domes prevents the water from escaping on either side of the boat, this being effected by the air retainers l5. It should be apparent that the air from the front of the boat having filled the area II, and as the ceiling of the air dome or the forward area ll inclines downwardly toward the stern, the faster the boat travels the greater the air is compressed in said air dome and thus causing the stern to ride on compressed air which exists between the bottom of the boat and. the water.

In Figures 4, 5 and 6 of the drawings there is shown a slight modification, wherein the bottom C has a V area I6 starting at the bow flat and terminating in a deep V about approximately three-fourths of the length of the hull from the bow, then a reverse V formation area I! terminating at the stern fiat. In this V formation area l6 there are built longitudinal steps I8, each step having an incline upward from the front edge to the back edge or a tilt upward toward the keel, while on each side chine starting slightly forwardly of the reverse V formation area I! is an air retainer l9, this terminating at the stern and extending down below the bottom of the chine.

It is, of course, understood that the area [9 is gradually inclined in a rearward direction and likewise the area i7 is gradually inclined toward the stern and this area constitutes an air dome.

Arranged midship is a pull propeller 29 having its power shaft 21 horizontally disposed and located considerably below the bottom of the boat, so that the propeller 20 when driven will clear the said bottom and thus work in undisturbed water, which gives maximum efficiency in the driving of the boat.

It should be apparent that by reason of the construction of the bottom of the boat the said bottom is riding on aerated water, which reduces water resistance to the minimum and the only limit to the boats speed is the revolutions and pitch of the propeller. In a rough sea, the risers of the steps 54 and i8 act as shock absorbers and thus pound in the sea in a shearing motion, with the result of stabilization to the boat to eliminate. sidewise drift, particularly in a side wind, and materially increases the strength of the boat bottom.

When the boat is in motion at the areas I i, l3 and II, respectively, the said areas are never void of air and the faster the boat travels the more the air is compressed, with the result that the stern will be. carried high without a squatting or dragging action at this point. The entire boat will be held on top of the water; it at no time going through the water, but gliding on the top. The boat is susceptible, by reason of the bottom formation, of turning in a small circle and is stabilized at all speeds and in a rough sea, and particularly at high speed, it being assured of level and easy riding, free from bumps and vibrations.

The propeller shaft 2i is operated through connection with any suitable source of power.

The boat with the bottom construction is susceptible of maximum speed of travel, more seaworthy, possessed of greater carrying capacity, shallow drift and is susceptible of being run at high speed through a narrow channel or stream and pulls no swell and throws no side Waves, it gliding over the top of the water instead of plowing through the same. The boat can be held in its course in heavy side currents or side winds and in shallow drift will be steady, and Without danger of ground running.

What is claimed is:

i. In a boat construction, a bow end bottom having V formation and inclined rearwardly, a stern end bottom of upwardly arched formation and inclined rearwardly to provide throughout the same an air dome immediately in rear of the V shaped formation, the upwardly arched formation being inset within the body of the boat to be disposed elevated with respect to the plane of the V formation and wholly within the body and means disposed at opposite longer edges of the bottom and extending slightly forwardly of the upwardly arched formation and terminating at the stern end for providing air retainers at the air dome.

2. In a boat construction, a bow end bottom having V formation and inclined rearwardly, a stern end bottom of upwardly arched formation and inclined rearwardly to provide throughout" the same an air dome immediately in rear of the V shaped formation, the upwardly arched formation being inset within thev body of the boat to be disposed elevated with respect to the plane of the V formation and wholly Within the body, means disposed at opposite longer edges of the bottom and extending slightly forwardly of the upwardly arched formation and terminating at the stern end for providing air retainers at the air dome and steps at the V formation and inclined in the direction of a keel and having perpendicular risers.

3. In a boat construction, a bow end bottom having V formation and inclined rearwardly, a stern end bottom of upwardly arched formation and inclined rearwardly tb provide throughout the same an air dome immediately in rear of the V shaped formation, the upwardly arched formation being inset within the body of the boat to be disposed elevated with respect to the plane of the V formation and wholly within the body, means disposed at opposite longer edges of the bottom and extending slightly forwardly of the upwardly arched formation and terminating at the stem end for providing air retainers at the air dome,

steps at the V formation and inclined in the direction of a keel and having perpendicular risers and a propeller depending midship and operating fore of the air dome.

MILTON D. CARR, JR.

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