Improved Propeller Screws and their Application to Ships of all kinds.
Year: 1890

page_text: Date of Application, 10th July, 1890-Accepted, 16th Aug.,
1890
COMPLETE SPECIFICATION.
Improved Propeller Screws and their Application to Ships of
all kinds.
I, JOSEF HAAS, Junior, of No. 84 Haupt Strasse, in the City of Vienna, Austria,
Engineer, do hereby declare the nature of iny said invention, and in what manner the
same is to be performed, to be particularly described and ascertained in and by
the following statement :-
My invention relates to improved propeller screws, and their application to ships of
all kinds, the object being to so apply the said propeller screws to vessels that the
screws are fully protected and arranged near the side walls in the interior of the
vessel, but beneath the lower water line, in order to be readily accessible. My improved
propeller screws can, however, be arranged in the longitudinal centre of the ship
parallel to the keel.
In the accompanying drawings,
Figure 1 is a longitudinal section of the screw with mantle,
Figures 1, and 1 are cross sections of the same,
Figure 2 is an elevation, partly in section, and
Figure 5 a longitudinal section of a part of my invention representing two
modifications of the bearings.
Figure 3 is a top view,
Figure 4 a partial top view representing my invention applied to a ship,
Figure 6 is a cross section on the line x-x in Figure 3.
The screw S is preferably provided with several wings, the number of which can be
varied at desire, as represented for instance in the sectional Figures 1", 1" and 1°. This
screw S with its casing is rotarily arranged between two tubes R, (Figs. 2 and 5),
toothed wheel gearing being provided for driving the same. The casing to the screw
carries one or more toothed rings Z, only one of such rings being, however, shown in
the drawing. The tubes R are securely fixed near the side planks in the interior of
the ship, and several screws can be employed in the same according to the space or
proportional length. The screw is rotated by means of the toothed ring Z, which is in
connection with the machine by means of appropriate gearing.
I
When the screw rotates the water around the screw and in the tubing will also be
put in rotary movement, and simultaneously driven out of the tubing at great speed
in the direction of the arrows, Figure 3, and parallel to the axis of the screw, whilst
the water in front of the screw will be sucked in. According to this arrangement the
screws will drive the water out of each tube at very high speed and in a constant
compact stream, whereby the full power of the machine, less the loss of power by
friction, is transmitted to the ship, whilst the water in the tubing acts on the machine
in the manner similar to that of a fly wheel.
In this case the proportion of labor effected to the power applied is considerably
more favorable than according to the customary methods of employing propeller
screws.
By means of the arrangement of the propeller screws on both sides of the ships, it
is possible to alter the course of the vessel in any direction without applying the
rudder, by reversing the movement of one of the screws, or if the speed of one screw
or a set of screws is reduced or the same are stopped, the ship can be caused to change
tack with or without using the rudder. For instance, by using the arrangement of
the propeller screws as represented in Figure 3, one half of the power of the machine
could, in the last mentioned case, be applied for manoeuvring the ship. By arranging
the outflowing stream of water from the tubes R, as shown by the dotted lines in
Figure 3. increased rapidity of movement can be attained for smaller vessels by
altering the direction of the outflow of the water. The lateral and central arrange-

page_text: ment shown in Figure 4 can be applied for a like purpose as aforementioned. If this
movement of the screw is reversed the ship will be moved in the opposite direction.
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 :-
In ships, the arrangement and application of propeller screws S with appropriate
casing and any desired number and size of wings rotarily arranged in the tubing R,
which run the entire or part of the length of the ship and are fixed on the sides or in
the centre of the ship, (amidships), beneath the lower water line, substantially as
specified, and shown.
Dated this 10th day of Jul, 1800
W. P. THOMPSON & BOULT,
Agents for the Applicant.