MENTS IN PROPELLERS FOR THE PROPULSION OF VESSELS
Year: 1884

page_text: GEORGE THOMPSON DICKINSON of 17 Lily Avenue of the City and County of
Newcastle upon Tyne do hereby declare the nature of my invention for IMPROVE-
MENTS IN PROPELLERS FOR THE PROPULSION OF VESSELS to be as follows:-
The general object of this propeller is to press against the water during every
part of its revolution without taking it round with it, and thereby forcing the Ship
forward, so that the Ship may glide through the water without being stopped as
they are by the action of the ordinary screw propellers.
With a screw a Ship can only go about as fast as the pitch and rate of the screw
drive it.
The Blades to be the same width from the Boss to the outside end, the outside
corners being rounded off and a champher being taken off the edges and ends of the
Blades.
The Blades to be fixed in the Boss at an angle of about 25 Degrees with the
shaft Front edge of the Blades to be at right hand side of shaft and the back
edge to be at the opposite or left hand side of the shaft.
The front edges of Blades being in advance of the Boss it is always (in going
forward) in fresh (unchurned) water and instead of carrying the water round with
it will press against the water and move the Ship forward and the Blades will not
act as brakes upon the Ship as is usual with Screw Propellers in general.

page_text: I GEORGE THOMPSON DICKINSON of the City and County of Newcastle upon
Tyne Gentleman do hereby declare the nature of my invention for "IMPROVE-
MENTS IN PROPELLERS FOR THE PROPULSION OF VESSELS". and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
-
The general object of my Invention is to provide a Propeller which will press
against the water during every part of its revolution without taking the water
round with it, thereby forcing the ship forward through the water with a gliding
movement instead of an intermittent movement as is the case with screw propellers
as hitherto constructed.
With a screw a ship can only be propelled about as fast as the pitch and rate of
revolution of the screw will drive it.
Figure 1 of the accompanying drawing is a side view and Figure-2 a plan of a
propeller constructed according to my Invention. Figure 3 is a transverse section
of one of the blades.
4
According to my Invention each of the blades A is the same width from the
base B to the outside end a the outside corners being rounded off as shewn at a³
and a chamfer being taken off the edges and ends of the blades as shewn at a³.
The blades A are fixed in the boss Brat an angle of about 25 degrees with the
shaft. The front edges of the blades A. are at the right hand side of the shaft and
the back edges thereof are at the opposite or left hand side of the said shaft.
The front edges of the blades being in advance of the Boss the propeller is
always (in going forward) in fresh (unchurned) water and instead of carrying the
water round with it will press against the water and move the ship forward and
the blades will not act as brakes upon the ship as is the case with screw Propellers
as hitherto constructed.
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 :-
Propellers for ships or like vessels constructed substantially as hereinbefore
described and illustrated by the accompanying drawings.
Dated this 14th day of October 1884.