Improvements in Means for Propelling and Steering Vessels, also in Means for Removing Leakage from Vessels and Forcing Water Aboard.
Year: 1895

page_text: Date of Application, 6th Mar., 1895-Accepted,. 1st June, 1895
COMPLETE SPECIFICATION.
Improvements in Means for Propelling and Steering Vessels, also in
Means for Removing Leakage from Vessels and Forcing Water
Aboard.
PAUL BAUMERT, of 178 Uhlandstrasse, Charlottenberg, near Berlin, in the
German Empire, Civil Engineer, do hereby declare the nature of this invention,
aud in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
This invention has been designed with the object of avoiding some of the
principal objections to the use of screw propellers as ordinarily arranged for the
propulsion of navigable vessels.
My improvements are illustrated by Figures 1 and 2 of the accompanying
drawings, which represent respectively longitudinal and transverse sections through
the propelling apparatus.
The screw propeller S, is contained within the after end of a tube A, the
outlet, a, of which is placed as deep in the water as possible, and has a sectional
area equal to the sectional area of the tube A, minus the sectional area of the boss
and the vertical cross section of the blades. The forward end of the tube A is
curved gently, so as to receive water freely at b, below the vessel, or the pipe may
be branched to receive the water on one or both sides, the curvature of the pipe or
pipes being in any case as flat as possible so as to reduce resistance. By this means
the screw compels a dense compact stream of water to issue from the outlet a, in
the most favourable form and position for propulsion. Either one only or two or
more of the propelling devices may be employed, as may be preferred. If two or
more are used, they are arranged on opposite sides of the keel, as indicated by the
figures, where however only one screw and tube are shewn upon one side of the
vessel.
It may be arranged that the openings a and b may be closable by sliding doors
or equivalent devices, in order to facilitate opportunities for repairs.
In case of leakage in the vessel, the forward opening remaining closed, the
tube A may be placed in communication with the hold by means of a suitable pipe
and non-return valve arranged in front of the propeller, when the rotation of the
screw will withdraw the water from the vessel.
The screw may be caused to act as a centrifugal pump for forcing water aboard
by closing the outlet a and placing the tube A in communication behind the
propeller with a pipe lending to the point where the water is desired.
In the event of an accident to tho machinery and the vessel having to proceed
under sail, the propeller will offer no resistance.
By the use of this system of propulsion no vibrations are experienced; with the
employment of twin screws the steering and manouvring are facilitated owing to
the greater compactness of the discharged streams of water; the propellers are
never exposed, and there is no racing.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. For the propulsion of navigable vessels, one or more sorows each rotating
within an open tube, substantially as hereinbefore described and as illustrated by

page_text: 2. In a system of screw propulsion for navigable vessels in which the screw is
contained within an open tube, the combination and arrangement with the tube of
devices for closing one or both ends and for putting the tube into communication
with the interior of the vessel, substantially as and for the purposes hereinbefore
described and as illustrated by the accompanying drawings.
Dated this 5th day of March 1895.
W. E. HEYS & SON,
Agents for the Applicant.