IMPROVEMENTS IN PROPELLERS FOR SHIPS AND OTHER STRUCTURES AND APPARATUS THEREFOR to
Year: 1885

page_text: I, WILLIAM WELCH of 13 Kings Terrace, Portsmouth in the County of Hampshire,
(Civil Engineer) do hereby declare the nature of my invention for IMPROVEMENTS
IN PROPELLERS FOR SHIPS AND OTHER STRUCTURES AND APPARATUS THEREFOR
to be as follows:-
In the formation and construction of the surfaces, and perimeter, of the Blades,
and their combined action in producing Centripetal, Parallactic, and Centrifugal
Forces, acting on the principles of the "Screw" whereby an equable and efficient
power is attained, and preventing vibration and "slip" as with ordinary "Screw
Propellers."
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The centre, surfaces, and perimeter, of the Blades, are produced in the following
manner.
The length or diameter of the Propeller being determined, a plane circle is
described, equal thereto, the entire area forming the surface of tlie Blades.
The centre of the circle, to be the centre of the propeller, and to be considered
the centre of revolution, produced in the centre of the driving axis, or shafting.
Froin and through tlie centre of the circle, a vertical, and horizontal, line is
produced, dividing the circle, in the horizontal line, thus ihaking two semi-circles,
each forming the seperäte Blades of the Propeller, The vertical line to be produced
in the axis of revolution, around which the seperate Blades revolve, right and left
handed, and fixed at any required number of degrees, the perimeter of the Blades
being the circumference of the Propeller, and crossing the centre of the axis of
shafting at any angle of degrees, such angle to be considered the progressive, or
retrograde "pitch" of the Propeller.
The Blades are attached either direct to the shafting, or to any ordinary or
suitable "boss" in fixed form, or attached to the Feathering Apparatus, to suit any
angle of degrees-Any number of Blades, is to be used and the whole or any
section of the plane of the Blades, to be used.
Propellers thus formed will be more efficient, in action, preventing vibration, and
may be of much less diameter, than ordinary "Screw Propellers," and are also
especially adapted for propulsion within tubular, and enclosed channel ways, and
acting in single, or multifold, form on one line of shafting.
Dated this 11th day of Anril 1885.

page_text: Improvements in Propellers for Ships and other Structures and
Apparatus therefor.
WILLIAM WELCH of 13 Kings Terrace Portsmouth, in the County of Hants
(Civil Engineer) do hereby declare the nature of my invention for IMPROVEMENTS
IN PROPELLERS FOR SHIPS AND OTHER STRUCTURES AND APPARATUS THEREFor
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
The object of my Invention is to produce propellers of a more universal, equable,
and efficient power, and less in diameter than propellers now in use, reducing
vibration and "slip," and especially for the propulsion of water atmosphere &c,
within tubular, or channel ways, enclosed, acting in single or multifold form,
producing Centrifugal, Centripetal, or Parrallactic forces.
In order that my Invention may be fully and practically comprehended, viz :-
The formation, centre, surfaces, and construction of the propellers are preduced in
the following manner.
The diameter of the propeller being determined, a circle equal thereto is described,
the entire area forming the surface of the Blades, the centre of the circle to be the
centre of the propeller, and to be considered the centre of revolution, produced in
the centre of the driving axis or shafting.
The surface of the Blades, are in cases where desireable extended into elliptical
form and thereby in enclosed tubular channel ways, or open propulsion made to act
upon an entire cylindrical area, in solid form.
From the centre of the circle, or elliptical surface, a vertical, and horizontal line
is produced, dividing the circle or elliptical surface horizontally, which line is to be
the entering, or leading edge, of the Blades, and thus forming two semi-elliptic or
circular surfaces, each forming the seperate Blades of the Propeller.
The vertical line to be produced in the axis of revolution in the centre of the
Blades, around which the seperate Blades revolve, right and left handed, and fixed
at any required angle-The perimeter of the Blades, being the circumference of the
propeller, and crossing the centre of the axis, or shafting, at any angle of degrees,
such angle to be considered the progressive, or retrograde "pitch" of the propeller.
The Blades are attached direct to the shafting, or to any ordinary suitable
cylindrical, or spherical "boss," or Feathering Apparatus to suit the angle of degrees
required Any number of Blades are used, and the whole, or any sectional
configuration thereof.
Where a greater quantity of water, atmosphere &c, is to be acted upon with a
small diameter, especially in tubular and enclosed spaces, the Blades are worked in
connected sets or pairs, and extended behind each other on the driving shafting,
forming any degree or "pitch" from the centre-line, whereby the whole length of
the cylindrical solid, equal to the extended Blades are acted upon and the water &c
displaced, and proportional progressive, or retrogade power attained.

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
1st The formation and construction of propeller Blades, of semi-circular, or
elliptical seperate planes, the entering, and delivery edges, extending throught the
whole length of the transverse, or horizontal diameters, and continuing its action
over the entire surface and angle of progression during each revolution..
2nd Obtaining a more equable and efficient propelling power with much less
diameter than with the present forms of Propellers, by extending the area of
con-centric angular surface over the several Blades.
3rd The formation of Propeller Blades of a universal character, acting either in
"Screw" or "Paddle Wheel" form and equally efficient in an horizontal, vertical;
or angular position.
4th Extending the propelling surface area, by working the propellers in connected
sets, or pairs, behind each other, in close, or elongated, and manifold form.
Find this eth1
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1000