US1055874A - Boat-hull. - Google Patents

Description

J. CAMPBELL.

BOAT HULL.

Y APPLICATION FILED mus, 1911'. 1,055,874. Patented Mar. 11,1913.

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J. CAMPBELL.

BOAT HULL.

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1,055,874. Patentd Mar. 11,1913.

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JOHN cAmPiiELt,

OF MINNEAPOLIS, MINNESOTA, ASSIGNOB OF .ONE-HALF TO THOMAS E. MODERMOTT, F MINNEAPOLIS, MINNES OTA.

' BOAT-HULL.

gimm filed m 6, 1911. Serial No. 525,524,

Be it known that I, Jorm CAMPBELL, a

" citizen of the United States, residing at- Minneapolis, in the'coiintyfofHennepin and State of Minnesota, have invented certain new and useful Improvements in Boat- Halls; and I d'o hereby declare the following to be a full, clear,nand exact description of the invention, such as will enable others skilled in the artto' which it appertams to make and use the same.

My invention has for.its object to provide a launch or motorboat of the'highest possible speed capacity, and, tothis end, the invention consists of the novel constructionand arrangement of parts hereinafter de- 'scribed and defined in-the claims.

In designing the hull -or body oft-his motor boat, I have made the same much in the.form of a fish. That. is, the 'largelor relatively wide body portion'is 'placedi'in front close to thebow and a long narrow tail portion-is extended at the stern. -The cock-pit for the engine and the passengers is arranged in the relatively-wide front portion and th tail or narrowedstern portion is preferably made an -'air-tight compartment. Also, as'afea-tdre of .the invention, Iprovide two propellers, one located at the of the narrowed stern-orf tail and the other located below theinte'rmediate poi" tion of the hull, preferably slightly at the Both of these pro rear of the cock-pit. pellers may, and preferablyLWill be, driven from (the same engine; The rear propeller may have its axis and shaft horizontally extended, while the front or lower propeller will have its axis and shaft inclined. The rudder is preferably mounted beneath the boat just at the rearof the front or lower propellen' f'- In the accompanying drawings which illustrate the invention, like characters indicate like parts throughout the several views. 7

Referring to the drawings, Figure 'l-is aperspective view, showing the improved boat; and Fig. 2 is a plan view thereof, with some parts broken parts sectioned.

The relatively-wide body or front portion 1 of the boat hull preferably extends about half the entire length of the hull, and the portion 2 extends approxi-' narrowed 'tail mately the other half of the length of the by the rapid passage of the boat through 'thewatier.

explosive type.

that may be imparted to the boat with the away and some i' lflcation of Letters Intent, Patgnted Mar. 11, 1911;.

' hull. The body 1....1 "tail portions 1 and 2 are united by gradually curved lines which are designed to best adapt themselves to the wake or roll of the water produced The numeral 3 indicates th which is formed int-he body 1, as already indicated, and the numeral 4 indicates the.

air-tight compartment formed withinthe tail portion 2.

The numeral 5 indicates the rear propeller and the numeral 6 the frontor lower propeller, the shafts of which will be extended into the'cock-pit'and, as already stated, preferably connected to a common engine or motor, not shown, but which would preferably of the multi-cylinder The numeral 7 indicates the rudder'which is mpunted at the rear front propeller '6, as s hdwm-in a bracket 8 secured to the bottom ofthe boat. This rudder may be controlled by any suitable connections, not .shown.' p

Boat hulls, as generally designed, have such short stern portions-or these stern portions are so abruptly terminated that, under high speed, very greatsuction and back-- draw is produced on the-boat hull. The long gradually narrowing tail rtion2 re-' duces to a minimum the 'backraw or drag of the boat hull under high speeds and, hence, correspondingly increases the speed motor of any determined power. Also, the arrangement of the propellers increasesthe speed capacity of the-boat. -The rear propeller 5 produces a direct forward pressureon the boat while the front propeller 6 produces a pressure which is mainly directly forward but which is also slightly upward,

so that the draft of the hull, under high speed, is somewhat decreased.

The air compartment or chamber in the 100 tail of the boat hull gives a buoyancy which is required to keep the hull approximately level even under high speeds and, furthermore, it berves as a safety device to prevent sinking of the boat in case ofaccident.

By reference to Fig. 1, it will be noted that the body portion 1 and tail portion 2 of the hull are approximately the same depth throughout. This is important where the long tail or stern is employed and is a no cockpitfeature which, combined with the said long tail, makes it possible to keep the boat hull approximately horizontal under all speeds.

What I claim is:

1. A boat hull having'arelatively wide body portion extended immediately rearward from its bow and'having a relatively narrow and long tail portion extended rearward therefrom on curved Concave lines, the

said bod and tail portions having approximately t e same depth. i

2. A boat hull having a relatively wide body portion extended immediately rearward from its bow and having arelatively Copies of this patent may be obtained for and the said tail portion being formed hol-\2o low and air tight.

In testimony whereof I aflix my signature in presence of two witnesses.

JOHN CAMPBELL.

Witnesses:

HARRIET A. CREW, HARRY D. KILGoRn.

five cents each, by addressing the Commissioner of latentsv W ashington,D.C. 4

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