Improvements in and relating to the Propulsion of ships and Boats.
Year: 1888

page_text: Improvements in and relating to the Propulsion of ships and Boats.
I HERBERT JOHN HADDAN of the firm of Herbert & Co, Patent Agents of
18 Buckingham Street, Strand W.C. London in the County of Middlesex, Civil
Engineer, do hereby declare the nature of this invention, a communication to me
from abroad by Wenzel Hotmann of Vienna in the Empire of Austria, Manufacturer
to be as follows:-
This invention consists in a novel method of airanging screw propellers for driving
ships and boats and rudders in combination therewith.
The propellers are arranged in pairs one on each side and are carried on suitable
frames in such a manner that the supposed cylinder described by the screw will not
intersect the side of the vessel if produced within a distance from the screw of at least
two diameters. There may be one pair or two pairs, one pair near each end of the
vessel or there may be more than two pairs The rudders are arranged one before and
one behind each propeller. The rudder shafts are carried in frames and are provided
with cranks connected together by a rigid frame for simultaneouse action when
steering. These improvements may be adapted generally to vessels, they are
advantageous however especially for vessels propelled by man power. The propeller
shafts are in such case geared by chain or other suitable gearing with treddle cranks
driven by man power.
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CAL
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page_text: COMPLETE SPECIFICATION.
Improvements in and relating to the Propulsion of Ships and Boats.
I HERBERT JOHN HADDAN of the firm of Herbert & Co Patent Agents of
18 Buckingham Street, Strand W.C. London in the County of Middlesex, Civil Engineer
do hereby declare the nature of this invention a communication to me from abroad
by Wenzel Hofmann of Vienna in the Empire of Austria Manufacturer and in what
manner the same is to be performed to be particularly described and ascertained in
and by the following statement:-
This invention consists in a novel method of arranging screw propellers for driving
ships and boats which is as follows
Each ship or vessel whether she be driven by machine ot man power receives for
that purpose four screw propellers, two at the fore end, and two at the rear end, and
these are arranged in such a manner that the supposed cylinder described by each
screw will not intersect the side of the vessel if produced within a distance from the
screw of at least two diameters.
In the accompanying drawings Fig. 1 is a diagram representing the screw propelleis
in plan view. Fig. 2 represents in vertical longitudinal section part of a boat provided
with the improvements Fig 3 shows the same in plan view, and Fig. 4 in front
elevation.
Similar letters of reference indicate similar parts throughout the figures.
In Fig 1, K is the body of the vessel, S1, S2, S3, S4, are the four screw propellers.
In Figs. 23 and 4 is shown the application of my invention to a boat moved
by men.
The
Every screw shaft 19 Journalled in a fork or ladder frame g which is suspended
movably upon a bracket B. This has for its object to enable the fork with the propeller
shaft to be lifted in order to clear and lubricate the bearings During this operation
the fork or ladder may be held in its raised position by any known means.
propeller shaft receives its motion from the chain wheel (Figs. 2, 3 and 4) through
any known gear (chain wire rope etc.) from the chain wheel R keyed upon the shatt A.
The latter wheel is rotated by means of the bevel wheels ¹ operated by suitable,
gear according to the power exercised upon the treddle K' by the diver, which power
may be augmented by means of other treddles K2 K3 etc geared in the manner shown
with the treddle shaft K'
In
Figs. 2 and 3 show for instance the fore part of a boat moved by four persons
these figuies are only shown two parts of treddles, the other half of the boat, being of
the same construction is not shown; s¹, s² are adjustable seats for the drivers
The motion of the screw propellers may be effected, instead of by men, by steam or
other motive power and in this case, the driving mechanism is constructed according
to known principles The constructive arrangement of the bearings of the propeller
shafts, the number of the blades of the propeller may be chosen accordingly as the
ship is moved by men or motive power or according to the velocity desired.

page_text: There may also be employed three or more pairs of propelling screws instead of two
pairs, provided the same be placed at the sides of the boat or otherwise in such a
manner as to fulfil the conditions before mentioned as to the distance of free water
before and behind each screw propeller In general the details of construction may be
widely varied without departing from the principles of my invention.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim 18.
1. In ships boats or other water vehicles the combination of two or more pairs of
screw propellers (one pair being at the front of the vessel and one pair at the rear
thereof) said propellers being arranged in such a manner that the supposed cylinder
described by each screw will not intersect the side of the vessel if produced within a
distance from the screw of at least two diameters.
2. In ships or boats of every kind the combination of the screw propellers, of forks
or ladder frames serving as bearings thereto substantially as set forth and adapted to
be raised out of the water for the purpose described.
Dated this 4th day of February 1889.
HERBERT & Co.,
18, Buckingham Street, Strand, W.C,
Agents to Applicant.