Improvements in and relating to Boat Propelling Mechanism
Year: 1899

page_text: in
991 oldationa
COMPLETE SPECIFICATION.
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Improvements in and relating to Boat Propelling Mechanism
"
I, PAUL ROBINS TRETHEWEY, of Muskoka Falls, in the County of Muskoka,
Province of Ontario, Canada, Engineer, do hereby declare. the nature of this
invention, and in what manner the same is to be performed, to be particularly
described and ascertained, in and by the following statement: di
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My invention relates to improvements in boat propelling mechanism.
The object of my invention is to provide a simple and efficient means, for, prò-
pelling boats, which will enable them to be moved at a greater, speed, with a
less amount of power.
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To these and other ends, my invention consists in the improved construction
and combination of parts hereinafter described and particularly pointed out in
the appended claims.
parts
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In the drawings, in which similar numerals of reference indicate similar pa
in all of the figures.
Figure 1 is a diagrammatic side elevation of a boat provided, with my improve-
ments.
Figure 2 is a diagrammatic plan view of the same.
***
Figure is a horizontal sectional view taken on the line 33,of, Figure 5.
Figure 4 is a vertical section taken on the line 44 of Figure
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Figure 5 is a rear end view of one of the conduit channels showing the relative
arrangement of parts.
In the general method of boat propulsion as now practiced, two disadvantages
arise in the matter of speed these consisting first in the resistance of the water
through which the bow of the boat is forced, and second in the formation of a
wake."
vacuum at the stem, generally termed the
These disadvantages result in the loss of a great amount of speed requiring
a greater amount of power to operate the propeller, the movement of which
serves to increase the vacuum.
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Many attempts have been made to remedy these defects, and also to feniedy,
in the case of canal boats, the "wash" of the propeller causing the banks to
become affected, but these have proved unsuccessful, owing to various causes.i
The present invention, however, is believed to remedy these defects, by reducing
the resistance at the bow of the boat and preventing the formation of the
vacuum entirely or to a great extent.
This is accomplished, primarily by placing a channel or conduit, or a series of
them from end to end of the boat, the front end allowing of the inlet of the
water at the bow. The water passes through the channel, drawn therethrough
by means of a propeller or screw, and passed out through the rear end, the
passage of the water outward forcing the boat ahead. The propeller or screw,
being located in the channel, no churning" of the water at the rear of the
boat can ensue, enabling canal boats to pass along in the banks of the canal,
at greater speed.
"
To enable a better understanding of the principles to be had, I will now describe
a construction, shown in the drawings, which will illustrate the manner of

page_text: The boat is provided with a central longitudinal channel 2, preferably circular,
having its front end reduced as shown at 3 but opening out through the bow
of the boat, the channel being preferably located along the keel.
Near the rear end of the boat, the channel is camed upward, as at 4, leading
to a channel 5, of slightly reduced size, which continues rearwardly in a longi-
tudinal plane with the channel 2, and has its rear end open.
A shaft 6 extends from the interior of the boat, where it is connected to any
suitable source of power supply, and on said shaft is mounted a propeller or
screw 7 having a periphery approximately of but slightly smaller size than that
of the channel 5. This may, however, be varied as the channel may be formed of
a diameter several times larger than that of the propeller.
If desirable similar channels may be located along the sides of the boat as
shown, where increased speed is desired.
The operation will be readily understood.
The channels 2 and 5, being below the water line of the boat, water will pass
into the channel 2 until it is filled. When the propeller is operated, the water
in the channel 5 will be forced outward through the rear of the boat, forming a
current through the channels 2 and 5 which carries the water from the bow
of the boat through the boat and passes it out of the rear, causing the boat to
move forward, with decreased friction' and the absence of the retarding effects of
the vacuum.
The advantages are many and are thought to be obvious.
While I have herein shown a preferred form of carrying my invention into
effect, yet I do not desire to limit myself to such preferred details of construction,
but claim the right to use any and all modifications thereof which serve to
carry into effect the objects to be attained by this invention in so far as such
modifications and changes may fall within the spirit and scope of my said
invention.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
1. The method of propelling boats, consisting in passing water from the front
of the boat, through said boat and forcing it out of the stern, by power secured in
the path of movement of said water.
2. The combination with a boat, having a channel extending from the front
to the rear thereof, both ends of said channel being open; of meaus, mounted
within said channel for passing water rearwardly through said channel whereby
the boat will be propelled forwardly, substantially as described.
3. The combination with a boat, having a channel extending from the front
to the rear thereof; of a propeller operatively mounted in said channel, for passing
the water rearwardly through said channel whereby the boat will be given a
forward movement, substantially as described.
Dotad this 1ct doy of Va 1890
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.