Flying Machine Page: 5 of 6
[2], 4 p. : ill. ; 23 cm.View a full description of this patent.
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i,204,r74
The'central tetrahedral framework is pro-
jected rearwardly to provide asteering:tail
60'having the rudder' 61 and elevators 62.
This steering tail is composed of a lower
5 member 63, which is a projection of the lower
edge 'member 1 of the central part of the
framework, the upper central member 64
and -lateral' members 65; 66, and 67, 68; dis-
pdsed to opposite sides of the members 63
10 and 64; these members being projections of
the-tie-rods which form parts of the horizon-
tal- frames of the central tetrahedral' frame-
work. Similar diagonal and intersecting
braces 69 and 70 are connected between the
15 several parts of the steering tail.
The. aeroplane framework is provided
with suitable sustaining' planes, there being
four such in the 'present drawings, which
planes are cambered and mounted in the
20 framfework in- stepped relation. The top
plane 71 extends across the machine between-
the tie-rods 29 and 30. The second plane 72
is 'set slightly to the rear with respect to the
plane 71 above, and is shorter in length, as
25 required by the tetrahedral shape given the
framework. In a like manner the- third
plane 73 is set a similar distance to-the rear
of the second plane 72, and is still shorter.
The fourth.plane 74'is at the-lower rear part
30 of the framework to the rear of the plane 73
immediately above it, and of the shortest
length.
Each of the tetrahedral portions of the
framework may be provided with complete
35 power plants 75, 76 and 77, with individual
propellers 78, 79 and 80, and each portion of
the framework is furnished with its in-
dividual float- 81, 82 and 83, respectively, to-
gether with the ground wheels 84, 85' and 86.
40 The central steering tail is also furnished
with. a' float 87. In a similar way each part
of the framework may be made to receive
platforms, gun mounts, fuselage, etc., as re-
quired' for the character of the work which
45 the machine is to be used.
If desired, a forward sustaining plane 88
may also be employed and which is prefer-
ably at substantially the same elevation as
the lower rear plane' 74, and being of sub-
5o stantially the same length.
It will be noted that any one of the three
tetrahedral portions of the framework shown
combined in the present drawings, may be
separated out and provide by itself an in-
55 dependent flying machine with all necessary
parts.
It will also be apparent that a flying ma-
chine may be built up of a greater number
of tetrahedral parts than the three shown
60 in the drawings, and they may be overlapped
in various modifications without departing
from the spirit of the present invention.
It will be appreciated that the frame-
work as herein described, is knitted together
66 in an exceedingly strong and rigid combi-nation, each of the 'parts of which is subject-
ed to' a minimum strain; and for this reason
these-parts may be constructed of material
which is now the practice to reject as being
unfit for aeroplane construction, and in this 70
way that cautious selection which aeroplane
construction now demands as respects its
materials, is. entirely eliminated in my pres-
ent invention.
The words "tetrahedron" and "tetrahedral 75
figure" in the claims are intended to mean
either the complete geometrical figure, or
merely sections or truncated figures.
It is obvious that those skilled in the art
may vary the details of construction and ar- 80
rangements of parts without departing from'
the spirit -of my invention, and therefore I do
not wish to be limited to such features ex-
cept as may be required by the claims.
I claim': 85
1. In a flying machine, the combination of
a framework built to resemble a tetrahedron,
a -series of curved sustaining planes mount-
ed in stepped relation at the rear part. of
said framework, propelling means mounted 90
in the forward part of said framework, a
steering tail forming a projection of the
lower part of said framework, and steering
means carried on said tail, substantially as
described. 95
2. In a flying machine, a framework built
up in the figure of a tetrahedron, sustaining
planes mounted in said framework, propel-
ling means carried by said framework, a
steering tail forming a projection of said ioo
framework and built in substantially tetra-
hedral form, and steering means carried by
said tail, substantially as described.
3. A flying machine consisting of an open
framework built up in substantially the 1o5
shape- of a tetrahedron, the top prism of the
tetrahedral framework being removed, a
sustaining plane mounted at the top of the
framework substantially at the base of the
removed prism, other sustaining planes 110
mounted in the framework below the first-
mentioned plane,. propelling means mounted
in the framework, a steering tail extending
from the framework, and steering mecha-
nism carried by such tail, substantially as 115
described.
4. A flying machine composed of a frame-
work built up in the form of a tetrahedral
figure resting on one of the edges, the top
prism extending at right angles to the lower 120
edge being removed, a long sustaining plane
mounted in the top of the framework at
substantially the base of the removed prism,
other progressively shorter sustaining planes
mounted at various elevations in the frame- 125
work below the first-mentioned plane, means
carried by the framework whereby the ma-
chine may be propelled, a steering tail ex-
tending from said framework, steering
means carried by said tail, and launching 130a
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Reference the current page of this Patent.
Critchett, J. C. Flying Machine, patent, February 18, 1919; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1259430/m1/5/: accessed July 8, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.