US1198211A - Propeller. - Google Patents

Description

F. C. GOETTERT.

PROPELLER.

APPLICATION FILED DEC-28, 1914.

1,198,21 1-. Patented Sept. 12, 1916.

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stantially parallel arrangement.

FRED C. GOETTEBT, 0F ABERDEEN, WASHINGTON.

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Specification of Letters Patent. Patented Sept. 12, 1916.

Application filed December 28, 1914. Serial No. 879,297.

To all whom it may concern: 1

Be it known that I, FRED C. Gon'r'rnn'r, a citizen of the United States, and a resident of Aberdeen, in the coimty of Ghehalis and State of Washington, have made certain new and useful Improvements in Propellers, of which the following is a specification.

My invention is an improvement in propellers, and has for its object to provide a device of the character specified, adapted for use in water craft of every character, and wherein the propelling mechanism is arranged to bore into the water, instead of pounding against the water, thus reducing slippage and increasing the speed in accordance with power, saving fuel, and reducing vibration of the boat and slippage of the propeller, and facilitating reversing, and eliminating swell and dead water.

In the drawings: Figure 1 is a perspective view of the propeller mounted on its shaft,

and Fig. 2 is a longitudinal section slightly enlarged.

The present embodiment of the invention is shown in connection with a propeller shaft- 1 having a key-way 2 at its lower end, for engagement by a key 3, which prevents the blade to be described from rotation with re-' spect to the shaft.

The propeller proper comprises a hub 4 adapted to fit the shaft closely, and blades 5 and 5' spirally arranged with respect to the hub and the shaft, and the blades are integral with the hub. Each blade it will be noticed from an inspection of Fig. 2 is of considerable thickness at the hub, gradually decreasing in thickness toward its free outer edge. Each of the blades 5 and 5 extends half way around the hub, the two blades being oppositely disposed and having a sub- The front and rear faces of the blades are straight 'at one end and convex and concave, respectively, at the opposite end as indicated most clearly in Fig. 2. The intermediate faces of the blades gradually conform to the terminal faces. In practice the propeller is arranged with the ends of the blades having the straight faces forward and the ends with the concavo-convex faces rearward. Thisgives the best results as the blades obtain a maximum working purchase upon the water and a minimum work detracting resistance.

The key 3 prevents rotary movement of the hub and shaft with respect to each-other, and the hub is provided with a key-way 6 registering with thekey-way 2 for receiving the key. A pin 7 is passed transversely of the shaft at the lower end of the hub, to prevent displacement of the propeller longitudinally oftheshaft. The pitch of the blades 1s in accordance with conditions, and the size will depend upon the size of the boat with which the propeller is to be used.

The improved propeller is non-breakable when in motion, and should a blade strike an obstruction, it will easily slip off of the same without becoming caught and broken. The direction of movement of the boat is quickly changed with the improved propeller, and the reverse is almost instantaneous with practically no swell and no dead water. The vibration of the body is greatly reduced, and there is also a great saving in fuel amounting from thirty-three and one-third to-forty per cent. The improved wheel bores into the water, instead of pounding, thus reducing vibration and slippage to a minimum.

The blades may be made much stronger,

, because they extend so shorta distance from the axis of rotation, and by making them of greater thickness adjacent to the hub, they are strengthened and reinforced at this point. With the ordinary form of propeller, when rotated beyond apredetermined speed, power is lost, the water being driven away from the propeller, so that there is nothing forithe propeller to push against. With the present form this cannot happen.

I claim:

1. A screw propeller embodying oppositely disposed spirally arranged blades, said blades having their front and rear faces straight at one end and convex and concave, respectively, at the opposite end, and having the intermediate faces gradually conforming to the terminal faces.

v2. A propeller comprising a hub, oppositely disposed blades extending half Way the intermediate faces gradually conform.- around the hub in a spiral direction, said ing to the terminal faces. blades being thick adjacent to the hub and tapering toward their outer edges, said FRED GOE'TTERT' blades having their front and rear faces WVitnesses:

straightat one endiand convex and concave, H; M: Le- RUE JIL,

respectively, at the opposite end; and having DJ J: COLLINS.

Copies of this patent may--be-obtainedfor five: centseach, by addi'essingzthe Commissioner of Patents, Washington, I). G.

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