A New or Improved Arrangement of the Propellers and Rudders of Vessels.
Year: 1892

page_text: Date of Application, 23rd July, 1892
Complete Specification Left, 16th Sept., 1892-Accepted. 22nd Oct. 1892
PROVISIONAL SPECIFICATION.
A New or Improved Arrangement of the Propellers and Rudders of
Vessels.
I, JOHN SMITH MC ANDREW, of 99 Douglas Street, Glasgow, in the County of
Lanark, North Britain, Ship Owner, do hereby declare the nature of this inven--
tion to be as follows:-
This invention relates to a new or improved arrangement of the propellers and
rudders of vessels. In accordance with my invention I mount the propeller and
rudder amidships, or thereby, in lieu of at the stern, the object of the said arrange-
ment being to keep the propeller always submerged, and so to prevent the racing
of the engines.
When applying my invention to a double or twin screw vessel I construct the
vessel with two suitably shaped recesses or propeller chambers, arranged imme-
diately abaft the amidship bulkhead. Inside each of these recesses or chambers, I
mount a propeller which may be mounted direct on to the projecting end of the
engine's crank shaft, or, if desired, to a short propeller shaft, thus obviating the
necessity of long propeller shafts as at present.
The partition or wall which divides the two recesses or chambers is formed with
an opening into which the rudder is mounted in any suitable manner, the whole
thus forming an arrangement by which the propeller and rudder are always sub-
merged, and, to a certain extent, protected from damage, by the keel which extends
the whole length of the bottom of the vessel.
I may employ more than oue set of propellers and chambers, such for example
as two or three sets, in the latter of which case a set would be mounted amidship
and a set fore and aft.
Dated this 22nd day of July 1005
JOHNSONS,
115, St. Vincent Street, Glasgow, Petitioner's Agents.
COMPLETE SPECIFICATION.
A New or Improved Arrangement of the Propellers and Rudders of
Vessels.
I, JOHN SMITH MANDREW of 99 Douglas Street, Glasgow in the County of
Lanark, North Britain, Ship Owner, do hereby declare the nature of this inven-
tion 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 a new arrangement of the propellers and rudders of
vessels.
In accordance with my invention I mount the propeller and rudder amidships, or
thereby, in lieu of at the stern, the object of the said arrangement being to keep
the propeller and rudder always submerged and so prevent the racing of the
engines.
Figure 1 of the drawings is a part side elevation of a double or twin screw
vessel constructed in accordance with my said invention.
Figure 2 is a part transverse section of the same taken on line A B, Figure 1.
I construct the vessel with two recesses or propeller chambers B immediately
abaft the amidship bulkhead C. Inside each of these recesses or chambers B I mount
propeller D which may be mounted direct on to the projecting end of the crank
haft of the engine or if desired to a small propeller shaft so as to obviate the
ecessity for the long propeller shafts as heretofore.
гр. 027

page_text: The partition or wall E which divides the two recesses or chambers B is formed
with an opening e into which the rudder F is mounted.
Thus the propellers D and-rudder F are always submerged, and, to a certain
extent, protected from damage, by the keel G which extends the whole length of
the bottom of the vessel.
I may employ more than one set of propellers and chambers, such for example
as two or three sets, in the latter of which case one set would be mounted amidship
and one fore and aft.
Also the propeller shaft may be mounted either parallel to the keel or at angles
thereto.
I may also mount the propelier or propellers amidships and let the rudder remain
at the stern as hitherto.
By the employment of my said invention any existing sailing yacht or vessel
may be easily and readily converted into a steamer.
1.
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
1st. In the construction of vessels, the arrangement of the propeller amidship,
or thereby, in lieu of at the stern, substantially in the manner as, and for the
purposes as hereinbefore described and shown in the annexed drawings.
2nd. In the construction of vessels, the arrangement of the propeller and rudder
amidship, or thereby, in lieu of at the stern substantially in the manner as and for
-the purposes herein before described and shown in the drawings.
Dated this 15th day of September 1892.. ·
JOHNSONS,
115, St. Vincent Street, Glasgow, Applicant's Agents.