Propeller Page: 3 of 4
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UNITED STATESPATENT OFFICE.
DAVID H. BLAKE, OF SAN ANTONIO, TEXAS, ASSIGNOR OF FORTY-EIGHT ONE-
HUNDREDTHS TO JAMES W. HAPPLE, OF SANDERSON, TEXAS, ROBERT E. JOHN-
SON AND LE GRAND MERRIMAN, BOTH OF PECOS, TEXAS, AND CHARLES H.
MERRIMAN, OF NEW YORK,' N. Y.
PROPELLER.Speciilcation of Letters Patent. Patented July 23,1912.
Application filed April 10, 1912. Serial No. 689,699.To all whom it may concern:
Be it known that I, DAvD H. BLAK, a
citizen of the United States, and a resident
of San Antonio, in the county of Bexar and
5 State of Texas, have invented a new and
Improved Propeller, of which the following
is a full, clear, and exact description.
The invention relates to marine propel-
lers, and has for an object to provide a form
10 of propeller designed to give increased effi-
ciency in proportion to its size, and to pro-
vide in connection with the improved pro-
peller novel means of preventing a vacuum
behind the propeller.
15 The invention will be particularly ex-
plained in the specific description herein-
after to be given, and then pointed out in
the claims.
Reference is to be had to the accompany-
20 ing drawings forming a part of this speci-
fication, in which similar characters of ref-
erence indicate corresponding parts in all
the views.
Figure 1 is a side elevation of a propeller
25 embodying my invention, showing the same
applied to a vessel; Fig. 2 is a front view
of the propeller; Fig. 3 is a plan view; Fig.
4 is a cross section on the line 2-2 of Fig.
3; and Fig. 5 is a sectional view of my im-
30 proved means for conducting air to the keel
and stern of a vessel.
The improved propeller comprises a hub,
tapered toward its front end, as at 10, and
a pair of similar blades disposed on the hub
35 at right angles to each other, and each con-
sisting of two members 11, 12, at right an-
gles to each other. The planes of the re-
spective members 11 of the blades transect
each other, as clearly shown in Fig. 3, and
40 are disposed radially to the hub 10 and at
an angle of about forty-five degrees to the
axis pf the hub, while the members 12 are
parallel with the axis of the hub, and in
planes parallel with each other. The mem-
45 bers 11 and 12 of each propeller blade are
so proportioned as to present surfaces sub-
stantially of equal area. Each member 11
presents at its rear face a straight flat sur-
face 13 of substantially rectangular form,
50 and each member 12 presents at its inner
face a similar straight flat surface of sub-
stantially rectangular form. The radial
members 11 extend for their full width tothe inner line, or a point where they join
the hub 10, and the said blades are conter- 55
minous with each other, the inner or base
lines of the blades meeting on the median
line of the hub 10. With the radial mem-
bers thus formed and thus emanating from
the median line of the hub, the two transect- 60
ing members 11 will present surfaces ex-
tending to the axis and there is therefore
no space for the passage of water adjacent
to the axis. The forward surfaces of the
radial members 11 taper toward the sides, 65
providing thin edges 20, and presenting a
front surface rounding toward each edge
20 of the said member. Similarly, the mem-
bers 12 that extend parallel with the axis
of the hub taper in three directions at their 70
outer sides and are therefore of gradually
reduced thickness toward the two side edges
21 and the free rear edge 22, so that the
outer surfaces of the said members 12 are
on lines tapering rearwardly in all direc- 75
tions from the juncture with the radial
members 11. By forming the radial mem-
bers 11 the full width to the center of the
hub, and thus preventing all passage of the
water at the hub, slip is prevented, and the 80
churning of the water and lost motion of
the propeller are minimized. Also the ra-
dial blades at their center give an effective
propelling pressure against the water with-
out dragging of the center of the propeller, 85
and the entire volume of the water within
the plane presented by the rear faces of the
blades is forced backward.
The members 12 of the propellers consti-
tute more than mere flanges, since they.will 90
have a propelling action themselves because
of their relation to the axis of the propeller
and to the radial members 11, as viewed in
plan or in side view. Thus it will be seen
from Fig. 3, that the inner edge of each 95
member 12, or the line on which said mem-
ber joins the radial member 11 is inclined
to the axis of the propeller, and thus in the
rotation of the propeller the blade 12 will
have a propelling action somewhat after the 100
manner of the propelling force exerted in
sculling.
In connection with my improved pro-
peller, it is desirable to prevent a vacuum
in the rear of the blades, particularly since 105
there is no direct space for the water to pass1,033,662.
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Reference the current page of this Patent.
Blake, David H. Propeller, patent, July 23, 1912; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth515030/m1/3/?q=%22%22~1: accessed June 21, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.