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Патент USA US2409241

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Oct. 15, 1946.
_
T. C, BARBER
2,409,238
AIRPLANE FLIGHT TRAINER
Filed Feb. 19, 1943
14 Sheets-Sheet l
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Filed Feb. 19, 1943
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Filed Feb. 19, 1943
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Patented Oct. 15, 1946
UNITED STATES PATNT OFFICE
2,409,238
AIRPLANE FLIGHT TRAINER
Theodore (3. Barber, Seattle, Wash.
Application February 19, 1943, Serial No. 476,403
11 Claims.
1
This invention relates to apparatus designed
for: use in instructing and training student air
plane pilots; the present device being in the na
ture of an improvement upon the Flight control
coordinator that has been described and illus~
trated in my copending application ?led on No
vember 10, 1941, under Serial No. 418,579, now
(01. s5_‘12)
2
timeter, air speed indicator, rate of climb indi
cator, tachometer, clock, etc, and in which cab,
mechanisms have been provided for causing these
instruments and devices to operate in accordance
with movements of the present ?ight control de
vices and parts associated therewith, thus, by
their readings, to indicate the conditions or situ
ations which would normally result in actual
Patent Number 2,336,711, Dec. 14, 1943.
?ight under similar conditions of operation, and
It is the object of this invention to provide a
in
this way to teach the student the fundamental
10
ground training apparatus whereby a student
principles of proper flightv control and in so doing,
pilot may acquire a comprehensive understanding
to make it possible for him to more easily grasp
of the various controls and instruments as nor
an
instructor’s directions and teachings when
mally used in an airplane, their purpose and
?ight training in air is undertaken, with less
mode of use, the results accomplished through
nervous strain and consequently with faster prog
the manipulation of controls individually and
ress in mastering flying problems and in becoming
the relationship and results of their functions
e?icient-as an airplane pilot.
when used conjointly or collectively.
Still further objects of this invention are to be
It is also an object of this invention to provide
found in the construction of the various parts of
means whereby to teach the student pilot the
the training device, in their operative relationship
basic principles of airplane ?ying, involving the
to each other, in their functions, and the rela—
coordination of movements of foot and hand op
tionship or their functions to each other.
erated control devices; to better impart the proper
In accomplishing the above mentioned and
understanding of the purpose and use of those
various other objects of the invention, I have
instruments that are visually applied to the in
provided the improved details of construction, the
strument panel; to enable the student to acquire
preferred
forms of which are illustrated in the
the sense of proper feeling of the "manually oper
accompanying drawings, wherein
ated controls in stable flight and to develop the
Fig. l is a perspective view of the present
faculty in the student to act while thinking of
more than one thing at a time.
Still another object of the invention is to equip
the training cab with a model airplane, disposed
in a position visible to the pilot while in training
position at the controls and so connected with
the controls and associated apparatus with which
the training cab is equipped that it will maneu
ver, or change position in the same manner as
flight training cab.
Fig. is an elevation of the instrument panel
showing the arrangement of instruments thereon.
Fig. 3 is a longitudinal section of the cab show
ing the mechanism at the right hand side of the
central vertical plane.
'
Fig. 4 is a similar section showing parts at the
left-hand side of the central vertical plane of
would ordinarily be expected of an airplane in
flight if its controls were similarly manipulated,
thus to visually demonstrate to the student in
the cab.
Fig. 5 is a plan, or top view of the cab with the
cover removed to better show location of main
struction, and in its instruments and accommo
strument panel.
training the action in ?ight of the plane due to 40 parts of the apparatus; some of the parts being
omitted to avoid confusion of illustration.
his handling or movement of controls.
Fig. 6 is a horizontal section, substantially on
More speci?cally stated, the various objects of
line
6-6 in Fig. 3.
>
the present invention reside in the provision of
Fig. '7 is a perspective view illustrating the‘ ar
a ground training apparatus that, for conven
rangement of foot controls and the operating con
ience, is herein referred to as a, “training cab”;
nection with the ball bank indicator on the in
this cab being comparable in size, plan of. con
Fig. ‘7a is a plan view of parts shown in Fig. '7. i
dations, to the pilot’s cockpit of the typical train
Fig. 8 is a perspective view of the stick assembly
ing plane, and having control equipment corre
and some of the directly associated parts.
50
sponding to the usual hand and root controls,
Fig. 9 is a side view of parts‘ associated with
and having an instrument panel on which are ar
ranged devices made to indicate readings or con
the stick and rocker shaft.
Fig. 10 is a cross sectional view on the line
ditions that are to be obtained by the usually
lil—l0 in Fig. 9.
employed instruments such as the directional
Fig. 11 is a, top view of the motor and disk
gyro, gyro turn and bank, arti?cial horizon, al 55
2,409,238
3
assembly whereby the model airplane is rotated.
Fig. 12 is a detail showing linkage between the
right foot pedal and the adjusting lever for the
motor whereby the model plane is turned from
side to side.
Fig. 120 is a top view of the linkage of Fig. 12.
Fig. 13 is a cross sectional view of the cab, sub
stantially 0n the line l3—|3 in Fig. 3, showing
4
that the common types of airplanes used for
training purposes, as well as many used in com
mercial ?ying, have their instrument panels
equipped, at a location readily visible to the pilot,
with an instrument known as a gyro-turn and.
bank indicator, or with an instrument for a simi
lar purpose, which visibly indicates to the pilot
whether or not the plane is in stable ?ight. One
the ball bank indicator operating linkage and
of such types of such instruments employs a ball
foot controls.
10 that is movable under the in?uence of gravity, in
Fig. 14 is an enlarged view of connections of
rods with the ball bank indicator and operating
linkage.
an arcuately curved glass tube of liquid. The ball
is so arranged that it will move from a neutral
position toward opposite ends of the tube in ac
Fig. 15 is a front elevation of the machine
cordance with the degree of bank of the plane ex
showing the mechanism that is adjacent the front 15 cept as those movements might be in?uenced by
end; parts farther back being omitted to avoid
lateral forces that might be due to various causes.
confusion.
In the actual flight of an airplane, the operator
Fig. 16 is a vertical section on line l6--I6 in
normally endeavors to maintain the ball of the
ball bank indicator at a neutral position while
Fig. 17 is a vertical section on line l1—l‘l in 20 banked for turning as well as while in straight
Fig. 15.
Fig. 15.
?ight.
Fig. 18 is a plan view of the motor and its
mounting for operation of the altitude indicating
means; this being a horizontal section substan
If the plane should be banked by the action of
the ailerons alone, plane slipping normally re
sults. If the plane is caused to turn by action
tially on line I 8-| 8 in Fig. 16.
25 of the rudder alone, skidding normally will re
Fig. 19 is a vertical section on line I9—l9 in
sult. The actuation of the stick to bring about
Fig. 15, with some parts shown in Figs. 16 and
banking of the plane, or the actuation of the
17 omitted.
rudder in either direction, will normally result in
Fig. 20 is a section on line 20-20 in Fig. 19.
a certain unstable condition of the plane that will
Fig. 21 is a section on line 2|—2l in Fig. 15.
30 be indicated by movement of the ball of the bank
Fig. 22 is a detailed view of the adjustable
and turn indicator to an o?-center position in the
mounting of the aileron motor.
instrument, and it now is accepted teaching that
Fig. 23 is a cross section on line 23—23 in
only by the proper coordinated and conjoint use
Fig. 22.‘
of ailerons and rudder can the plane be brought
Fig. 24 is a section on line 24-24 in Fig. 22.
35 to and maintained in stable flight and the ball
Fig. 25 is a front view of the motor and ac
maintained at that neutral position indicating
tuated parts for control of banking of the model
stable ?ight. However, the exact manipulations
plane.
of hand and foot controls may vary under differ
Fig. 26 is a detail of the model plane support
ent ?ying conditions and at different speeds.
ing and operating linkage as seen looking in the 40 While in some unusual situations, a fair degree of
direction of the arrow 26 in Fig. 25.
stability in ?ight might be maintained by ma
Fig. 27 is a horizontal section of the linkage
nipulation of either the hand or foot controls in
as seen on line 21-21 in Fig. 25.
dividually, it is in accordance with best prin
Fig. 28 is a side view of parts shown in Fig, 27,
ciples of ?ight control and is the generally ac
looking in the direction of the arrow 28.
cepted procedure, that stability in ?ight shall be
Fig. 29 is a, detail of the operating mechanism
accomplished through ‘the conjoint and properly
of the gyro-horizon.
'
‘
Fig. 30 is a cross section on line 39-36 in
Fig. 29.
‘
Fig. 31 is a front view of the gyro-horizon dial.
Referring more in detail to the drawings
coordinated action of both foot and hand con
trols, and this anticipates also the proper use of
throttle and elevators.
’
The present training cab, preferably, is in ac,
cordance with the device shown in perspective
First, it will be explained that in the descrip~
in Fig. 1, and for most practical and obvious pur
tion, the use of the words “forwardly” and “rear
poses, this is made to correspond in shape and
wardly,” or “front” and “rear” has reference to
size to the cockpit portion of the typical training
the location of parts in the cab with reference to 55 plane.
the front and rear ends thereof; the rear end
The present training cab is designated in its
being that back of the student’s seat in the cab.
entirety in Fig. 1 by numeral I. In Figs. 3 and 4,
The present apparatus anticipates that it be
the cab is shown as comprising a horizontal bot
used in the training of student pilots in the fun
tom ?oor 2, right and left side walls 3 and 3',
damentals of ?ight control, while on the ground, 60 respectively, and a hood or cowl 4. Below the
and in this connection, provision is made for
cowl is an instrument panel 5 and rearwardly
stressing the importance of coordination of move
thereof is a seat 6 for occupancy by the student
ments of hand and foot controls, as well as the
in training. The ?oor, as here shown, is sup_
necessity of observing the readings of the vari
on relatively deep longitudinal, opposite
ous ?ght indicating instruments and acting in 65 ported
side sills ‘I mainly for the purpose of providing a
accordance with the readings, as an aid in main
desired clearance space below the floor for certain
taining proper balance in gliding, turning. bank
operating
parts of the mechanism, later de
ing, climbing, landing, and in various other ex“
pected or unexpected maneuvers of the airplane.
scribed, and there are cross sills 3 at opposite
ends of the cab and an intermediate cross sill or
In the following description, various problems of 70 brace
member 9.
?ight control will be explained along with the de
scription and explanation of use of the present
Foot controls
In
the
provision
of foot controls, simulating
In connection with one of the main objects of
those employed in the usual airplane, there is
the present invention, it will here be explained 75 here provided, transversely of the cockpit, at
apparatus.
2,409,288
5
Revolubly supported by this shaft Ill, at its oppo
through the bearing thereby to pivotally mount
site ends respectively, are upwardly extending
right and left foot controls l2 and I3, hereinafter
called foot pedals. These pedals are pivotally
mounted for forward and rearward movements
and each has a lever arm extending downwardly
therefrom. These lever arms, designated respec
tively by numerals [2a and 13a, pass through
floor openings I5, to some distance below the
floor. It has been shown in Figs. 3 and 4 that
two coiled springs I6, is have their forward ends
attached to the lower ends of these lever arms,
respectively, and their rearward ends attached
to brackets !l-ll' that are ?xed to under side
of the cab ?oor directly rearwardly of the levers.
Also, short lengths of chain 58, I8 are attached 20
to the lower ends of the lever arms and extend
forwardly therefrom and at their forward ends
are ?xed. respectively, to the opposite ends of
a horizontal cross lever 59. Lever I9 is pivotally
mounted at its center point by a pivot bolt l9’,
held in a supporting bracket 28, which, in turn,
is ?xed to the cross sill 9 of the cab. The two
coiled springs l6-—l 5 are under equal tension and
normally hold the foot pedals i2 and I3 evenly
at the designated neutral position, as seen in
Fig. 3. The connection of the foot pedals with
the cross lever l9 provides that when either foot
pedal is pressed forwardly, the connecting link
6
a vertical socket member 46 in which the lower
end of the joystick 45 is ?tted. The two side
straps 4| and 4|’ of the yoke pass across the
opposite ends of the tubular cross bearing 40, and
a pivot bolt 46 is extended therethrough and
suitable distance forwardly of the seat and closely
adjacent the floor, as noted best in Figs. 3, 4 and
'7, a horizontal shaft 50, rigidly ?xed to the floor
by brackets l I attached thereto adjacent its ends.
the yoke for forward and rearward oscillation of
the stick. It will be understood also that the
stick may be oscillated laterally in opposite di
rections by reason of the rotatable mounting of
the yoke supporting shaft 26 in the bearings 22
and 23.
The lower end portion of the stick mounting
yoke extends to below the ?oor through an open
ing 48 therein, Figs. 4 and 9, and at the under
side of the floor, coiled springs 49 and 50 have
ends ?xed thereto; these springs, respectively, ex
tend rearwardly and forwardly from the yoke, as
seen in Figs. 3 and 4 and have their other ends
anchored, respectively to a bracket 49' that is
attached to the cab ?oor and to the lower end
portion of the previously mentioned lever arm 32.
These two springs are under balanced tension
and normally retain the joystick 45 in an upright
and predetermined neutral position.
Fixed rigidly to the depending arm 32 and ex
tending directly forward therefrom, axially par
allel to shaft 26, as shown in Figs. 3, 4, 8 and 9, is
a shaft 52, with an upright suspending lever 53
at its forward end. The lever 53 has a support
ing pivot bolt 54 therethrough ?xed in a bracket
55 mounted on the cab floor. This pivot 54 is
axially alined with the pivot axis of shaft 26.
The upper end of the lever 53 extends somewhat
age will cause the other pedal to be moved rear
wardly a corresponding distance, as is the case 35 above the pivot 54 as seen in Fig. 4 for a purpose
in the action of the foot controls provided in
the usual airplane for the control of the rudder
presently to be explained.
Also, for a purpose
later apparent, a motor base 51 is ?xed to the
shaft 52 near its forward end, this being shown
action.
in Figs. 9 and 10. The shaft 52, as swingingly
H and‘ controls
Referring now more particularly to Figs. 3 and 40 suspended by the legs or levers 32 and 53, will be
oscillated from side to side, as is indicated by the
4 it will be noted that bearings 22 and 23 are
arcuate arrow placed thereon in Fig. 10, by the
?xed on the floor I. spaced apart on the central,
side to side action of the stick 45.
longitudinal line of the cockpit, the bearing 22
being just rearward of cross shaft l0 and the
Ball bank indicator and rough air mechanism
bearing 23 being located just forward of the seat
5. Rotatably supported in the bearings 22 and
23 are the forward and rearward end portions of
a horizontal shaft 28. The forward end portion
of the shaft 25 is revolubly held in the bearing 22
while the rearward end portion is revolubly held
in the bearing 23.
A lever arm 32 is ?xed rigidly to and extends
directly downward from the forward end portion
of the shaft 26, passing with clearance through
It is one of the purposes of this training equip
ment to teach the student the use of the ball
bank indicator and how, by reference to the ball
bank indicator, vto maintain stable ?ight in rough
50 air and to learn proper methods of correcting
mistakes he has made in control applications and
to arti?cially simulate the results of improper
control use and rough air. To arti?cially simu
late rough air conditions, I employ a mechanism
Located below the 55 which is shown best in Figs. 13 and 14. This
includes an electric motor 60 that is mounted on
the previously mentioned motor base 55, sup“
ported upon the shaft 52 near its point of ?xed
34’ shown in Fig. 6. which have inner ends ?xed
connection with lever 32. The motor 60 as shown
to the lower end portion of the lever arm 32 and
their outer ends attached to brackets 35 that are GU in Fig. 14 has its drive shaft extended into a
gear reduction housing 6! fixed on the motor and
adjustably ?xed to the side sills of the base frame
from which housing a lateral shaft 62 extends.
of the cab for equalizing spring tension. These
This shaft, which will be driven by the motor at
springs are under balanced tension that results
a relatively slow speed due to the gear reduc
in the lever arm 5°92 being maintained normally in
tion, has a short crank arm 63 at its outer end
vertical position.
and this crank arm is offset laterally from the
Fixed to the rear end portion of the shaft 26
vertical plane of the shaft 26. Electrical energy
and extending equally to opposite sides thereof.
an opening 33 in the ?oor.
floor, at opposite sides of the opening 33, and
transversely directed, are coiled springs 34 and
as shown best in Figs. 8 and 9, is a tubular cross
bearing 40, and pivot-ally mounted by this bear
ing is a yoke y for mounting the joystick 65.
This yoke comprises opposite side straps Al and
4|’, spaced apart along their media] portions and
joined together along their lower end portions,
and with their upper end portions directed to
ward each other and ?xed to the opposite sides of
for the motor can be supplied from a source of
supply under control of a switch located on the
instrument panel 5, such a switch being desig
nated in Fig. 2 by reference character S.
It will be understood then by reference to Figs.
8, 13 and 14 that axial oscillating movements im
parted to the shaft 26 by movement of the stick
45 from side to side, will cause corresponding
2,409,238 "
7’.
oscillating action of the motor '60, and since the
crank arm 63 is laterally offset from the vertical
plane of shaft 26, this action will cause the crank
by the motor 60 to stimulate conditions of rough‘.
air and unstable ?ight, it is the problem of
the student pilot, in accordance with the objects
arm mounting to be oscillated vertically to a cor
of this invention, by properly coordinated action
of the foot and hand controls, to nullify these
mechanically produced movements of the ball in
responding degree, and this causes oscillating
action of the crank arm as indicated by the double
ended arrow adjacent thereto in Fig. 14. The
purpose of this motion presently will be apparent.
The ball bank indicator of this training de
such manner as to retain it centered in the slot
or in what will be referred to as a neutral position.
It is possible also to stabilize the movements
vice as shown in Figs. 3, 4, 7 and 14 comprises a 10 of the ball that are mechanically produced by the‘
ball 65 movable in an arcuate slot 10 formed in a
motor 60 and the crank arm 63, through foot
horizontal direction in the instrument panel 5 in
the direct vision of the student pilot, when oc
cupying the seat 6. This ball is ?xed to the lower
pedal action; it being understood that by the
foot pedal connections made through rod 11, a
corresponding raising and lowering of the 0p
end of an arm 1| depending from a horizontal 15 posite end of the cross arm 16 may be accom
pivot shaft 12. Shaft 12 is held rotatably in a
plished. When the two rods 11 and 85 which
bracket 13 that is ?xed to the forward side of
support opposite ends of the cross arm, are moved
the instrument panel directly above the arcuate
up and down in unison by the proper coordina
slot. Fixed to the forward end of the pivot shaft
tion of hand and foot controls, the cross bar 16
12, as an extension thereof, is a ?exible steel shaft 20 will be moved accordingly and there will be no
15 which, at its forward end, is ?xed to the cen
tral portion of a horizontal cross arm 16.
turning action of the shaft 15 and consequently
Piv
no ball movement. Likewise, it is possible to nul
otally attached, as at 11a in Fig. ‘7, to one end
lify the up and down movements of the end of
of the cross arm 16, is a downwardly extending
cross arm 16 that might be produced through the
rod 11 which, at its lower end has an operating 25 rotating crank arm 63 when the motor is in oper
connection, later described in detail and shown
ation, by actuation of the stick from side to side in
best in Fig. 7 with a lateral crank arm 18' ?xed
synchronism with the crank arm rotation where
to a rod 18 that extends in the longitudinal direc
by to oscillate the motor supporting table to such
tion of the machine, and which at its rearward
extent that the point of crank arm connection
end has pivotal connection at 19a with the upper 30 with the lower end of rod 85 will remain at a con
end of a vertically directed link 19 that is con
stant horizontal level during rotation of the crank
nected pivotally at its lower end to a lever arm
arm 63, and no oscillating action of shaft 15 will
80 that is directed rearwardly from a rigid bar
be produced and the ball will remain at a set
position.
8| that extends along the-cross rod l0 and at
one end, is ?xed rigidly to the right foot pedal.
It will be mentioned here that the up and down
This connection of bar 8| with the foot pedal, as
movement of the cross arm 16 is here made pos
observed in Fig. 7, provides that the lever arm 80
sible without interference with rotation of shaft
will be oscillated vertically with the forward and
12 by reason of the use of the short length of
rearward movements of the foot pedals, and this
?exible shaft 15 that connects with the pivot
oscillation, by reason of the above described con 40 shaft 12.
necting parts 18, 19 and 80 in connection with
It is generally accepted as good flying prac
lever arm 18' and rod_11, can be employed to
tice that the ?ight of a plane should be 50 con
effect an oscillating action of the cross arm 16
trolled by coordinated action of foot and hand
about its opposite end support, whereby to rotate
controls, that the ball bank indicator will be
shaft 15 and, through the arm 1|, to impart oscil 45 maintained in a neutral position. The connec
lating movement to the ball bank indicator in
tions above described make this possible in this
slot 10.
training device.
' .
The rod 18, through which connection of rod
Assuming that the ball is being momentarily
11 is made with lever arm 89, is axially rotatably
moved by the “rough air” simulating action of
supported for a purpose that later will be ex
50 motor 60 from its neutral position to a position
plained in connection with the air speed indi
cator, but for the purpose of a?ording an op
erating connection between the foot pedal system
and the ball bank indicator, it is normally held
against rotation by means later to be disclosed. 55
toward the right, or left, as observed by the pilot.
it can be returned to its neutral position by dc
pressing the corresponding foot pedal and at the
same time moving the stick toward the opposite
side. If the movement of either, or both of these
Fixed pivotally to that end of cross arm 16
controls should be made toward the Wrong di
opposite that to which the upper end of rod 11 is
rection, the travel of the ball away from neutral
attached, is a downwardly extending rod 85 which,
will be accentuated, but when movement of both
at its lower end is ?xed pivotally as indicated in
controls is correctly made, return of the ball to
Figs. '7 and 14, at 85', to the end of the motor 60 neutral is possible and will be accomplished by
crank arm 63. Thus, with the stick and foot
relatively short movements of the controls.
controls held stable and the motor 60 running.
When it is desired merely to teach the student
it will be understood that the crank arm 63 will,
coordination of foot and hand action, for turning
in its rotation, move rod 85 upwardly and down
or banking, it is not necessary that the arti
wardly, thus oscillating ‘the cross arm 16 about 65 ?cially produced movement of the ball by the
its connection with rod 11, and by this oscillation,
action of the motor 60 and its crank arm be em
will turn shaft 15 in such manner as to produce
ployed, for, by reason of the operating connec
back and forth movement of the ball of the bank
tions previously described. it is possible for the’
and turn indicator that would simulate condi
student to move the ball from side to side in the
tions of unstable ?ight of the plane. This motor 70 slot, either by the foot pedal action or by lateral
connection is what has been referred to as the
stick action. and it is possible to correct the move
means for arti?cially creating rough air condi
ment of the ball, as produced by the action of
tions and conditions of improper use of the con
either, by a properly coordinated movement of
trols.
the other. For example, if the right foot pedal
Assuming that the ball 65 is being actuated 75 is depressed as in banking to the right, the-ball
'9
2,409,238
10
model plane will be described in detail later in
will be moved accordingly to the left from neutral
position. This movement can be corrected by
moving the stick to the right, and according to
the speci?cation.
In view of the object that the model airplane
shall be caused to maneuver to various positions,
such as different banked positions, and different
ment, when in actual ?ight, to maintain a stable
angles of ?ight in upwardly or downwardly nosed
condition. Practice along this line, then, consists
positions, in accordance with action of the con
in moving the ball from neutral by action of one
trols and corresponding to results to be expected
set of controls and correcting its position with
in similar action of the controls of a plane in
the other set. When a student has mastered the
coordination of foot and hand movements for 10 actual flight, I have provided a certain connec
tion with the stick whereby the forward and
stabilizing the ball bank indicator in the train
present day teaching that is the proper rnove- .
rearward actions thereof will cause downward or
ing plane, by this kind of practice, it will be easier,
upward nosing of the model plane accordingly.
when actual ?ight is undertaken, for him to
maintain the airplane in stable flight.
Other connections with the hand and foot con
15 trols provide for banking, and for e?ecting
In accordance with another object of the pres
ent invention, having to do with visually showing
change in banking angle of the model plane,
and turning of this model plane, as in the modern
airplane, is a result of banking when produced
by proper coordination of movement of ailerons
the student pilot what the attitude of a plane on
actual ?ight will be as the various controls are
and rudder controls. The ?rst mentioned con
nection for nosing the plane up or down, as seen
manipulated, together or individually, I have
mounted a model airplane above the cab, for~
wardly of the cockpit and in the student’s direct
line of vision. This plane, shown in Figs. 3, 4,
and 13, is designated by numeral Bi, and is hing
edly mounted, as at 88, upon the upper end of
a vertical supporting shaft 99. At its lower end,
in Figs. 2, 5 and 26 comprises a sleeve I95 of
substantial length that is slidable and rotatable
on the upper portion of shaft 89. This sleeve
Model plane and its controls
the shaft 99 is supported rotatably in a bearing
9i! that is mounted on a horizontal, transverse
shelf or platform 9! ?xed in the frame structure.
Somewhat above the bearing 99 the shaft is ro
tatably contained in a guide bearing 92 ?xed to
a frame member as noted in Fig. 4.
Fixed on the lower end portion of the shaft 35
is in two sections, an upper and a lower section,
that are independently rotatable, but which move
up and down together. A link I09 is hingedly
attached at its lower end, as at I91, to the upper
end of the upper section of sleeve 195 and at its
upper end has a hinge connection, as at I98, with
the model plane body somewhat rearwardly of
the hinge 38. A rod H6 is ?xed hingedly at its
upper end to the lower end of the lower section
of the sleeve I95 and it extends in a downwardly
and
rearwardly
inclined
direction,
then ' is
89, just above shelf 9!. is a horizontal friction
directed downward and at its lower end, is piv
disk 93 formed with a bevel peripheral edge sur
face 93'. Located at one side of the disk 93 (see
Figs. 5 and 11) is an electric motor 95 having its
otaiiy ?xed, as seen at I I I in Fig. 8, to the upper
end of a swingingly supported link H2. The
link lid is one of an assembly of links through
40 which the movements of various controls will
effect the position of the model plane. This
with the drive shaft se of a friction wheel 91.
linkage is best shown in Figs. 8, 9 and 10, wherein
The shaft 96 is carried in a gear housing 98 which
it is to be observed that the link H2 is attached
is ?xed to the motor, and the wheel 91, has con
by a pivot bolt M3 to the lower end of a link H4
tact at its periphery with the beveled edge sur
face of the disk 93. When the wheel 91, by reason 45 which, in turn, is pivotally attached by a cross
bolt H5 through its upper end to the upper end
of adjustment in position of the motor 95, is dis
of the previously mentioned post 51 that is ?xed
posed in that upright position at which its plane
on the shaft 52, and it is to be remembered that
coincides with the vertical plane of shaft 89, its
shaft 52 is suspended for oscillation by the lateral
rotation will have no turning influence on the
disk 93, and it will operate by reason of its con 50 or side to side action of the stick. The lower
end portion of link H4, which extends some
tact with the disk to hold the shaft 89 against
what below the level of shaft 52, has pivotal con
rotation and thus retain the model plane in a
nection, as at HIS, with the forward end of a
set position indicating its direction of ?ight.
horizontally directed rod or link I H which, at its
However, tilting the motor on its mounting, to
one side or the other, will cause the wheel 91 to 55 rearward end, has an operating connecting, later
to be described, with the lower end of the mount
be tilted accordingly, and its rotation will then
ing yoke for the stick d5, whereby forward and
impart turning movement to the disk 93 in the
rearward action of the stick will cause forward
direction of tilt of the wheel and at a faster or
and rearward swinging of the lower end of the
slower rate of speed depending on the degree of
.
60 link H4.
the angle of tilt.
It is to be observed by reference to Figs. 8 and
In connection with Fig. 12, I have designated
10, which show the assembly of links in a normal
by the dotted lines back of shaft 89 the normal
position, that the link H4 is vertically suspended
position of friction wheel 8"? with respect to the
from the pivot H5. and that link H2 has a
disk 93, and in dotted lines at the sides of shaft
89 have shown it tilted as for causing the disk ' pivotal connection Ii2a: at its lower end with a
link 2155, later described. Also, the link H2 is
93 to rotate in opposite directions.
inclined rearwardly to a substantial degree from
In order that the tilting or adjusting of the
its lower end supporting pivot H9, placing the
motor may be accomplished for the purpose
pivot point of connection IiI with rod H0, rear
stated, it is shown in Fig. 11 to be ?xed on a
base 99 hingedly pivoted by a shaft I69 to a sup 70 ward of the line of bolt IE5. Therefore, any for
ward or rearward action of the stick, whereby
porting bracket WI that is mounted upon the
in the usual operationof an airplane, the ele
shelf 9!; the hinge axis being axially alined with
vators are adjusted for nosing down or up, will,
the point of contact of disk 9'! with the beveled
through the connecting link II'I, cause link H4
edge surface of disk 93. The means provided
to swing likewise, and by the resultant pivotal
for tilting the motor to effect turning of the
shaft connected through suitable reduction gears
11
‘52,499,338
vmovement of the link I I2, on bolt II3, to tilt
the model plane accordingly, to visually demon
strate the normaleffects on- the airplane of such
operation of the stick.
It will here be mentioned, for later reference,
that the nosing action of the model plane pro
pivotal mounting on a cross shaft I47 in a hori~
zontally disposed supporting frame I48 and has
a horizontally directed arm I45b extended along
but terminating short of the forward end of
frame I48, this arm being connected at its for
ward end, as at I49, with the upper end of a link
I50 which extends downwardly and has a piv
oted connection I50’ at its lower end with a
lever arm I 52 ?xed rigidly to the previously men
duced in banking, is modi?ed by making adjust
ments of the link II2 which places its upper end
connection III with rod IIG closer or farther
from the line of pivot II5; it being understood
that when pivot II I is alined with pivot bolt II5,
swinging of the linkage on pivot II5 will have no
‘moving effect on rod IIB. The reasons for such
adjustments will later be apparent.
In order to bank the model plane in accord
ance with the results that might be produced
in actual ?ight by lateral actions or side to side
movements of the stick, I have provided a slid
:ing collar I29, shown in Figs. 4 and 25 rotatable
12
with the lower end of a vertical leg‘ I 45a- of a
bell crank lever I45. The bell crank lever has
tioned leg 53 and extended laterally therefrom,
as in Fig. 8, at the level of the pivot 54.
Thus,
' when the stick is actuated from side to side, as ,
about the upper portion of sleeve I05, and this A
has a link I2I pivotally attached thereto, as at
I22, and to the body of the model plane at one
side of its hinge mounting on shaft 89. Also,
there is a supporting sleeve I23 for the collar I20,
and this latter sleeve, which is freely ?tted about
the lower portion of the sleeve I05, has the up
per end of a rod I24 pivotally attached thereto.
The lower end of rod I24 connects pivotally, at
for aileron adjustment and control, the linkage,
above described, will actuate the bell crank I45
accordingly on its pivot I41, and this, through
the bracket I42, will cause the motor I35 to be
pushed forwardly or pulled rearwardly, accord
ing to the direction of movement of the stick,
and this, by reason of the resultant change of
the angular position of the friction disk I36 rel
ative to the line of the cylinder I 3| will cause
the latter to be moved endwise accordingly.
The frame I48 is hingedly mounted at its rear
ward end by supporting brackets I55 mounted
on shelf 9i so that its forward end may oscillate
vertically, and at its forward end, the frame
has pivotal connection at I56, with the upper end
I 26, with the end of an arm I21 that is rigidly
?xed to and extends in a horizontal direction 30 of a link I58 which, at its lower end as seen in
from the base portion of an upright rocker frame
, Fig. '7, has pivotal connection at I59 with a lever
structure, designated generally by numeral I28,
arm I60 that extends forwardly from the bar
this being seen best in Fig. 25.
BI previously described as being extended along
The frame structure I28 has a mounting hinge
the cross rod I 0 and having ?xed connection with
shaft I29 through its base. This shaft is held in 35 the right foot pedal; this being seen in Fig. '1.
brackets I 35 attached to the ?oor I, and is dis
posed in the longitudinal direction of the appa
ratus. At the upper end of the frame structure
I28, is a rotatably mounted friction cylinder I3I
disposed with its axial line directed transversely 40
Thus, this connection provides that the action
of foot pedals, which in the airplane would nor
mally cause rudder action as employed with
banking for turning, will cause an additional
angular adjustment of the motor I35 beyond that
of the machine and lying in a plane at a right
provided by the stick action, whereby travel of
the cylinder l3! will be speeded up.
It is the accepted practise that for best flight
machine.
control in making a turn, banking of the plane
Swingingly mounted, as presently described, .45 by the aileron action should be accompanied by
more in detail, above the friction cylinder I3I is
a corresponding rudder movement to avoid skid
an electric motor I35 adapted to drive a fric
ding or slipping. Therefore, in this trainer, the
tion disk I36 ?xed on a shaft I31 that extends in
student should, in practising the making of a
the general direction of the friction cylinder axis,
turn, conjointly use the stick and foot controls,
and is carried in a gear case £36’ attached to the w and in watching the manuevering of the model
motor. The disk edge rests upon the top edge of
plane, should also pay due attention to the po
the friction cylinder, and it is so arranged that
sition of the ball of the bank and turn indicator,
by swinging the motor mounting about its veiu
to see that it is maintained in neutral position
tical hinge axis, the friction disk will be caused
during the turning operation by properly coordi
to move accordingly, thus to change the angle -. nated movements of the controls used.
of its plane relative to the vertical axial plane
It is to be pointed out that, by the mecha
of the cylinder, so that, incident to its angular
nisms previously described, the banking of the
position and rotation of the disk, to cause the
model plane can be caused by stick action alone,
friction cylinder to travel in an endwise direc
and to some extent, by action of the foot con
tion, one way or the other, depending on the di 60 trols alone, although in actual ?ight of a plane,
rection of inclination of the friction disk. The
this latter would be undesirable as it might easily
rate of such endwise travel of the cylinder 'would
result in unstable ?ight. It has been explained
be dependent upon the extent of the angle to
that in the airplane, the extent of movement
which the disk is thus adjusted.
of these two controls to produce a given result will
The motor I35, as seen in Fig. 25 has a mount 65 be materially shortened and more stable ?ight
ing bracket I40 ?xed thereto, and this has a ball
will be possible when they are properly used con
and socket mounting I45’ with a support I4I,
jointly.
later described in detail. Also as seen in Figs.
, In the mechanism herein illustrated, for dem
4 and 5. there is a triangular bracket I42 lying
onstrating the shortened travel of the controls,
in a vertical plane, and fastened hingedly at its 70 when used conjointly to produce a desired bank
base and by a vertical hinge pin I43, to the mo
ing and turning action of the model plane, is due
tor.
to the fact that the supporting pivot I41 of the
Fig. 4 shows that bracket I42 extends from the
bell crank lever I45, through which the control
motor in a direction toward the rear of the cab
of position of motor I35 and friction disk is oband at its vertex has pivotal connection, at I44, 75 tained by action of the stick, changes with any
angle to the direction of the hinge shaft I29,
that is, in a vertical plane transversely of the
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