Improvements in Shallow Draught Screw Propelled Vessels.
Year: 1897

page_text: Improvements in Shallow Draught Screw Propelled Vessels.
We, FREDERIC CLAPAREDE, and CLEMENT CLAPAREDE, both of Quai de Seine,
Argenteuil, Seine, France, Engineers, do hereby declare the nature of this
invention to be as follows:-
This invention relates to very shallow draught screw propelled vessels of which
the hull on whatever lines it may be built, is formed with an extension at the
part where the screw or screws is or are situated (whether at the stern. at any
point along the sides at the stem or elsewhere), bounded at the underside by a
plane parallel or nearly so to the surface of the water and immersed to a certain
depth and merging or united directly or indirectly with the hull
completely separated therefrom, the domed chamber receiving the emergent
part of the corresponding screw being situated beyond the hull above the level
of this plane with which the dome of the chamber merges.
01'
An important development of the invention consists in the employment on the
same vessel of a great number of screw propellers of small diameter revolved at
à high rate of speed by suitable motors including turbomotors, steam turbines or
other rotary engines actuated by steam, or other fluid, or by a single engine of
any kind driving a generating dynamo from which electro motors on the several
screw shafts are actuated.
In one arrangement the plane referred to merges with or joins the hull in-
directly, one or several screw propellers preferably an odd number being used
and placed at the bow or -stern whether a sternpost be used or not.
In another arrangement the plane referred to merges with or joins the hull
directly and two or several screw propellers in even number being placed at the
bow or stern with or without a stern post.
.
In another arrangement the plane referred to is completely separated from
the hull, any number of screw propellers being used at the bow or stern.
In another arrangement any number of lateral screw propellers situated quite
at the sides of the hull are employed.
These examples suffice to show the impossibility of indicating all the possible
modifications on account of their great variety and represent only some of the
possible arrangements or combinations to which as regards the arrangements our
invention is in no way limited.
It is to be understood the the invention may be applied to any kind of boat the
domed chamber or chambers for the screws having any desired form or dimen-
sions and being provided or not with one or more rudders placed in the vertical
median plane of the chamber at the front or rear part thereof laterally or in any
other suitable position.
We may also make any suitable arrangement or combination employing a

page_text: stern post or not with one or more screws or one or more rudders, whatever may
be the form of the boat, without departing from the principle of the invention.
Dated this 12th day of July 1897.
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane.
Improvements in Shallow Draught Screw Propelled Vessels.
We, FREDERIC CLAPAREDE, and CLEMENT CLAPAREDE, both of Quai de Seine,
Argenteuil, Seine, France, Engineers, 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:-
This invention relates to very shallow draught screw propelled vessels of which
the hull on whatever lines it may be built, is formed- with an extension at the
part where the screw or screws is or are situated (whether at the stern, at any
point along the sides, at the stem, or elsewhere) bounded at the underside by a
plane parallel, or nearly so, to the surface of the water and immersed to a certain
depth the plane merging or being united directly or indirectly with the hull or
completely separated therefrom, the domed chamber which receives the emergent
part of the corresponding screw being situated beyond the hull above the level
of this plane with which the dome of the chamber merges.
An important 'development of the invention consists in the employment on the
same vessel of a great number of screw propellers of small diameter revolved at
a high rate of speed by suitable motors including turbo-motors, steam turbines, or
other rotary engines actuated by steam or other fluid, or by a single engine of
any kind driving a generating dynamo from which electro-motors on the several
screw shafts are actuated.
Reference is to be had to the accompanying drawings forming part of this
specification wherein Figure 1 is a longitudinal elevation of the part of the
vessel to which the invention is applied, illustrating one of the cases in which
the plane referred to merges with or joins the hull indirectly, one or several screw
propellers (preferably an odd number) being used and placed at the bow or stern,
whether the sternpost indicated in dotted lines, be used or not. Figure 2 is a
corresponding underside plan in the case of one screw, and Figure 3 is a similar
view shewing part of an arrangement comprising several screws, preferably an
odd number, say five. Figure 4 is a longitudinal elevation of the part of the hull
to which the invention applies, shewing one of the cases in which the plane above
referred to merges with or joins the hull directly, two or several screw propellers
in even number being placed at the bow or stern, whether the sternpost indicated
in dotted lines, be used or not. Figure 5 is a corresponding underside plan shew-
ing two screws only, and Figure 6 is a similar view of part of an arrangement
comprising an even number of screws, six for example. Figure 7 shews a longi-
tudinal elevation of the part of the vessel to which the invention applies, in the
case when the plane referred to is completely separated from the hull, any num-
ber of screw propellers being used at the bow or stern. Figure 8 is an underside
plan of a vessel, in the case of any number of lateral screw propellers situated
quite at the sides of the hull. In all these figures, A is the longitudinal axis of
the vessel, B the transverse plane or planes in which the propeller or propellers
is or are situated, and C is the water line.
These examples suffice to shew the impossibility of illustrating all: the possible

page_text: modifications, on account of their great variety, and represent only some of the
possible arrangements or combinations to which, as regards the arrangements
shewn, our invention is in no way limited.
It is to be understood that the invention may be applied to any kind of boat,
the domed chamber or chambers for the screws having any desired form or dimen-
sions and being provided or not with one or more rudders placed in the vertical
median plane of the chamber at the front or rear part thereof, laterally or in
any other suitable position. We may also make any suitable arrangement or com-
bination, employing a sternpost or not, with one or more screws, or one or more
rudders, whatever may be the form of the boat, without departing from the
principle of the invention.
ffi
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:
-
The herein described shallow draught screw propelled vessels wherein the
screw, or each of the screws, whatever may be their number or position, is located
beneath and partly received in a domed chamber rising from a horizontal boun-
dary plane situated below the water-line, the hull (considered as terminating
in the ordinary manner) being provided at each point where a screw is situate,
with an extension bounded at the underside by the said submerged horizontal
plane whether said plane forms a prolongation of the hull or is separated there-
from, the domed chamber receiving the emergent part of the screw substantially
as shewn in the accompanying drawings and for the purpose specified.
IS CIT ay or April 1898.
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.