Year: 1885

page_text: I, JOHN ISAAO THORNYCROFT, of Church Wharf, Chiswick, in the County of
Middlesex, a member of the firm of John I. Thornycroft & Co, Steam Yacht
and Launch Builders, do hereby declare the nature of this invention to be as
follows:-
In my specification N° 2043. A.D 1885, there is described a navigable vessel
constructed with an external hollow or recess at the under part of the stern to
partly receive the propeller or propellers, and having at each side thereof, a rudder,
the two rudders being connected in such a manner as to operate simultaneously.
Now, my present invention relates to a modification of the invention above
referred to, and has for object to enable a vessel to be efficiently steered by a
somewhat more simple and compact arrangement of parts than illustrated in my
above mentioned specification.
To this end, in lieu of employing two rudders, I provide a single rudder so
arranged in relation to a propeller, that whether it be driven ahead or astern, in
either case the water that leaves the propeller may act upon the rudder. In order
to make the arrangement compact, the axis about which the rudder works is, or
may be, inclined to a vertical plane co-incident with the longitudinal centre line
of the vessel.

page_text: I, JOHN ISAAC THORNYCROFT, of Church Wharf, Chiswick, in the County of
Middlesex, a member of the firm of John I. Thornycroft & Co, Steam Yacht and
Launch Builders, 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 :--
In my specification No 2043. A.D. 1885, there is described a navigable vessel
constructed with an external hollow or recess at the under part of the stern to
partly receive the propeller or propellers and having at each side thereof a rudder,
the two rudders being connected in such a manner as to operate simultaneously.
Now my present invention relates to a modification of the invention above
referred to and has for object to enable a vessel to be efficiently steered by a
somewhat more simple and compact arrangement of parts than illustrated in my
above mentioned specification.
To this end, in lieu of employing two rudders, I provide a single rudder so
arranged in relation to a propeller that whether it be driven ahead or astern, in
either case the water that leaves the propeller may act upon the rudder. In order
to make the arrangement compact, the axis about which the rudder works is, or
may be, inclined to a vertical plane co-incident with the longitudinal centre-line
of the vessel.
Referring to the annexed drawings Fig. 1 is a side elevation, fig. 2 an end
elevation, partly in section; and fig. a plan or top view shewing part of a
navigable vessel with my present arrangement of steering apparatus. 1 is the
vessel, 2 the external hollow or recess at the under part of the stern, and 3 a screw
propeller situated partly within the hollow or recess 2. According to my present
arrangement only one rudder (4) is used. This single rudder in the modification
illustrated is of curved form in vertical transverse section. It is arranged at one
side of the propeller in such a manner that when the propeller is driven-whether,
ahead or astern-water leaving it will act upon the rudder. 5 is the rudder head
extending upward through a stuffing box 6 and provided at its upper end with a
toothed sector 7 in gear with a worm 8 on a shaft 9 operated by a hand wheel 10.
As shown in the drawings the axis about which the rudder turns, is inclined to a
vertical plane coincident with the longitudinal centre line of the vessel, or in other
words is inclined to the vertical centre line of the vessel, which arrangement
admits of the parts being compactly situated and conveniently operated; but the
axis may be vertical if desired. The rudder may be operated in any other
convenient manner than that illustrated. 11 is a frame or support for carrying
the outer portion of the propeller shaft. There may be more than one propeller.

page_text: 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:
As a modification of the invention described in the Specification of my patent
N° 2043 dated 14th February 1885 the use of a single rudder arranged sub-
stantially in the manner hereinabove described to one side of the propeller (or
propellers).