Improvements in and relating to Vessels Propelled by Screws.
Year: 1889

page_text: Date of Application, 12th Dec., 1889
Complete Specification Left, 12th Sept., 1890-Accepted, 25th Oct., 1890
PROVISIONAL SPECIFICATION.
Improvements in and relating to Vessels Propelled by Screws.
We, FRANÇOIS DE WERNICKI, Civil Engineer, and COMTE THADÉE D'Oksza,
Gentleman, both of 23, Boulevard de Strasbourg, Paris, in the Republic of France,
do hereby declare the nature of this invention to be as follows:-
Our invention relates to screw propellers and to vessels propelled thereby and the
invention consists of what may be termed a multiple screw propeller constructed of
several screws placed one behind the other on the same rotary shaft, each screw,
forming part of the multiple screw propeller, being itself formed of several blades, the
number, form, development, and dimensions of which may be varied according to
requirements.
In applying our multiple screw propeller to a sea going ship we construct the
ship with a central recess or channel at the lower part to receive the propeller which
recess communicates with the rear part by means of two arched passages formed
between two lateral portions or bodies and a central or intermediate body which
supports the screw propeller shaft and serves to receive the motor or steam
generator.
When applying our multiple screw propeller to vessels for river navigation the
propeller is arranged underneath the vessel in a single central channel through which
passes the water thrown backwards by the propeller.
Several of our multiple propellers can be arranged on a single shaft or several of
such propellers can be arranged parallel to each other in a suitable space provided in
the vessel or boat.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in and relating to Vessels Propelled by Screws.
We, FRANÇOIS DE WERNICKI, Civil Engineer and COMTE THADÉE D'OKSZA,
Gentleman, both of 23, Boulevard de Strasbourg, Paris, in the Republic of France,
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 :-
Our invention relates to screw propellers and to vessels propelled thereby and the
invention consists of what may be termed a multiple screw-propeller constructed of
several screws placed one behind the other on the same rotary shaft, and which
co-operate to propel the vessel, each screw forming part of the multiple screw-
propeller being itself formed of one blade or several uniform blades, or blades,
the form, development and dimensions of which may be varied according to
requirements.
In applying our multiple screw-propeller to a sea going ship we advantageously
construct the ship with a central recess or channel at the lower part to receive the
propeller, which recess communicates with the rear part by means of two arched
passages formed between two lateral portions or bodies and a central or intermediate
body which supports the screw-propeller shaft and serves to receive the motor or
steam generator.
When applying our multiple screw-propeller to vessels for river navigation the
D

page_text: propeller is arranged underneath the vessel in a single central channel, through which
passes the water thrown backwards by the propeller.
Several of our multiple propellers can be arranged on a single shaft or several of
such propellers can be arranged parallel to each other in a suitable space provided in
the vessel or boat.
In order to enable our invention to be fully understood we will describe how it can
be carried into practice by reference to the accompanying drawing, in which-
Figure 1 is a longitudinal elevation of a screw-propeller constructed according to
our invention :
Figure 2 is a longitudinal section of a sea-going vessel shewing the manner which
we find advantageous of applying our multiple screw-propeller thereto :
Figure 3 is a horizontal section of the same:
Figures 4, 5 and 6 are transverse sections on the lines M N, P Q, and RS,
respectively of Figure 2:
Figure 7 is an end elevation of the vessel :
Figures 8, 9 and 10 are similar views to Figures 2, 3 and 7 but illustrating
our arrangement for applying our multiple screw-propeller to vessels for river
navigation.
Similar letters in all the figures indicate similar parts.
The multiple screw-propeller as shewn in Figure 1 comprises a number of screws
(four for example) H, H, H, H arranged behind one another on the same shaft M,
each screw consisting of four blades.
We will first describe the application of our multiple screw-propeller by reference
to Figures 1 to 7.
The multiple screw-propeller H is arranged in the middle of the vessel which
divided into two parts A, A connected above by a roof B so as to form a central recess
or chamber in which the propeller is placed. The propeller has one of its bearings
at a, in the front wall of the fore part of the vessel.
The two parts A, A of the vessel extend to the stern, and between them is formed a
downwardly projecting body D, the forward end of which carries the second bearing b
of the propeller shaft.
It will be seen by reference to Figures 2 to 7 of the drawing that the multiple
screw-propeller rotates in an arched chamber protected laterally from the force of the
waves by the lateral parts A, A which latter being extended to the stern form with
the intermediate downwardly projecting body D, two arched passages 0, 0 which
allow the water acted upon by the propeller to pass; the water passes out at the stern
of the vessel between the three stems e, e, e at the stern of the vessel.
It is obvious that the interior framing of the vessel is constructed in such a manner
as to firmly connect or tie together the three bodies or keels A, A and D between which
are formed the water passages.
For vessels for river navigation a more simple arrangement can be employed such
as that represented in Figures 8, 9 and 10. In this case the vessel is at the underside
formed with an opening or recess to receive the multiple screw H, the recess extending
from near midships to the stern so as to form a single channel O which allows free
passage of the water thrown backwards by the propeller.
The propeller is as the former case provided with a bearing at a in the front
body C, but as there is no body at the rear portion of the propeller in which the
latter can take its bearing, we arranged at E a support which is fixed to the roof
of the channel O.
The screws which constitute the multiple screw-propeller may be separated at
equal distances or be situated at various distances from one another. The screws
may also be of any known kind with rounded blades, blades cut at right angles
or pointed or of other form.
The rotary shaft or portion thereof which carries the multiple screw-propeller or
several multiple screw-propellers may be arranged either horizontally or obliquely, or
at any angle to a horizontal line.

page_text: Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, we declare that what
we claim is :
1. A multiple screw-propeller for ships and vessels constructed of several screws
placed one behind the other on the same rotary shaft, each screw forming part of
the multiple screw-propeller being itself formed of one blade or several uniform
blades or blades the form, development and dimensions of which may be varied
according to requirements, substantially as hereinbefore described and illustrated
in Figure 1 of the accompanying drawing.
2. The application of the multiple screw-propeller to a sea-going ship by con-
structing the ship with a central recess or channel at the lower part to receive the
propeller, which recess communicates with the rear part by means of two arched
passages formed between two lateral portions or bodies and a central or intermediate
body which supports the screw-propeller shaft and serves to receive the motor or
steam generator, substantially as hereinbefore described and illustrated in Figures 2
to 7 of the accompanying drawing.
.
3. The application of the multiple screw-propeller to a vessel for river navigation
the propeller being arranged underneath the vessel in a single central channel
through which passes the water thrown backwards by the propeller, substantially
as hereinbefore described and illustrated in Figures 8 to 10 of the accompanying
drawing.
4. The arrangement of several multiple propellers on a single shaft or several of
such propellers arranged parallel to each other in a suitable space provided in the
vessel or boat, substantially as hereinbefore described.
Dated the 12th day of September 1800
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.