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Патент USA US2406918

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Sept. 194g.
¿2,405,918
|-:.Y A. STALKER'
WING
y 4Filed Jan. 15, 1940
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Sept. 3, 1946.
E. A. STALKER
25406591 81
WING _
Filed Jan; 15, 1940
----.'
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4 Sheets-Sheet 3 `
' Sept. 3, 1946.
E. A. sTMKl-:Rl
WING
» 2,406,918
’
¿Filed @411.415.1940
F163. 12.
tm3. 13.
4 Sheets-Shea; 4
Patented Sept. 3, `1946l
2,406,918
UNITED STATES `PATENT "OFFICE
2,406,918
WING
Edward A. Stalker, Ann Arbor, Mich.
`
Application January 15, 1940, Serial No. 313,967
Y 13 Claims.
(C1. 244-42)
1
2
(_
My invention relates to wings and particularly
wings employing boundary layer control, and the
desirable to have a high arching of the mean
objects of my invention are first to provide a`
tional flap it is dii‘ñcult to achieve a high arching
and an upper surface free of abrupt changes of
curvature. The present invention provides gen~
erously curved upper surfaces with a high value
of the maximum ordinate of the mean camber
camber line.
means of increasing- the lifting capacity of wings
by slots employed with a specially shaped wing; ’
second to provide a wing with a variable area and
means to control the boundary layer; third to
provide mechanism particularly adapted to the
line.
manipulation of the movable ' portions» of the
Wing; fourth to provide a Wing adapted for eiii
cient lateral control.
l
In Figures 1 to 5a is shown the means of
10 cambering the Wing with a special type of flap
»
whereby a wing section of smooth curvature is
I attain these objects by the means illustrated
in the accompanying drawings in which
Figure 1 is a fragmentary top plan View of a
wing;
With a thin wing and the conven
obtained.
15 and the auxiliary at 5.
»
l
The wing is I and the Wing flap is 2, the aux
iliary flap is 3. The main nap 2 is pivoted at 4
'
Figure 2 is a section along the line 2--2 in
In the high speed attitude shown in Figure 2,
Figure l;
the auxiliary flap closes the induction slots 6 in
Figure 3 is a section along the line 2-2 in
the wing surface. The wing also has the dis
Figure 1 with the flap deflected;
charge slot 8 through which air is ejected by the
Figure 3a is a fragmentary spanwise section 20 blower 9 Which inducts air through the slot I0.
along the line 3ft-3a in Figure 3;
With the flap depressed as shown in Figure 3
Figure 4 is a fragmentary section along the
air is inducted also from the slots 6 and II.
line ßl--ll in Figure 1;
The flap 3 carries a group of T-shaped lugs I2
Figure 5 is a fragmentary top plan View of
which slide in a slot I3 of the flap 2. When it is
another wing;
depressed there is a slot II formed between the
Figure 5a is a fragmentary plan section of the
surface of flap 2 and the auxiliary ñap 3.
wing in Figure 1 to show the lever mechanism;
As shown in Figures 1 and 5a particularly the
Figure 6 is a section along line 6-6 in Figure 1;
nap is moved by the multiple lever device I4
Figure 7 is a fragmentary section along line
which is hinged to the wing at I5. The device is
6_5 in Figure 1 with the flap deflected;
30 moved by the'arm I6 which is pivotally supported
Figure 8 is similar to Figure 'Ito illustrate an
on the sparV Il. The arm is operably connected
unsatisfactory form of flap;
r
to I4 by means of a lug I8 which projects through
Figure 9 is a fragmentary top plan view of the
the slot I9 in the arm I6 which is rotated by the
preferred wing;
action of the piston 2l in the cylinder 22. Fluid
Figure l0 is a section along the line IU-Ißrin
pressure is conveyed to the cylinder through the
Figure 5;
tubes 23 and 24 and the direction of flow is con
trolled by a valve in the cabin of the aircraft
Figure l1 is a section along line lll-I0 in Fig
ure 5 with the flap> deflected;
Figure 12 is still another form of the invention
(not shown). .
A small movement of the lug I8 causes a large
shown in top plan view;
40 movement of the end of the lever device which
Figure 13 shows the wing of Figure 12 with the
is attached to the nap at 24.
.auxiliary Wing extended;
Thus the problem of obtaining a large flap
Figure 14 is a section along line III-_I4 in
travel with a small control motion is solved and
Figure 12; and
a flap is provided which preserves a smooth con»
Figure 15 is a section along the line I5-I5 .45 tour to the wing even when it is depressed through
`
a great angle.
I have shown in my U. S. Patent No. 1,913,644
The aileron is 25 and is operable in the usual
howthe induction and discharge of fluid -through
manner. Its inner end is shielded by the shield
vslots in the surface of a wing can increase the
26 so that the flow is across the aileron chord
in Figure 13.
maximum lifting capacity. The present appli
cation discloses means to increase the effective
ness of Wings employing slots.
r
50 wise even when the flap 2 is depressed. Without
l
For high speed it is desirable to use a relatively
thin wing of very little or no arching of the mean
camber line, but for high _lifting capacity it is 55
the shield there would be a flow spanwise along
the aileron into the low‘pressure area above the
flap 2 when‘it is depressed and this would reduce
the effectiveness of both.
'
`It is to be noted that the flap in the retracted
2,406,91á
3
4
flap or auxiliary wing here disclosed is of great
importance to thin wings, In fact boundary layer
position provides for the covering of the slot 6 so
that a smooth wing surface is available for high
control has not been successful heretofore on thin
wings but the present invention makes it possible
It is also to be noted that the curved forward
portion of the flap is important in providing a Cn to attain as high maximum lifting capacity on
thin wings as on thick.
generously curved upper contour of the wing
Customary flaps have a chord length of 20 per
when the flap is depressed.
cent of the Wing chord and are deflected 60 de
In the preferred form of the invention shown
grees to obtain their maximum lifting effect. I
in Figures 5 to 7 and 9 to 11 the aileron is a flap
21 of the type described and ahead of it is a series 10 ñnd that with the well rounded upper surface pro
vided by my invention the flap chord can be
of discharge slots 28 which are served with fluid
greatly increased preferably to 50 per cent and
by the blower 34, The aileron has the induction
the angle increased to 90 degrees preferably, The
slots 29 in its surface in communication with
desirable characteristics can be stated in terms
the blower inlet by means of the duct 30.
of the product of the flap chord expressed as a
The aileron is thicker than the portion of the
fraction of the wing chord and the flap angle ex
wing immediately ahead to provide a well rounded
pressed in degrees. Thus the value of the product
upper surface when the aileron is depressed. The
should be greater than l2.
additional thickness provides a greater radius of
speed ñight.
Another feature of the flaps and/or auxiliary
curvature as may be seen from a comparison of
Figures 7 and 8. The aileron of the latter figure 20 vanes I employ is that they are open along their
leading edge for communication to the front body
has the thickness of the normal wing section.
of the wing. This is difñcult to do, especially for
The auxiliary flap 3a is held against the aileron
flaps which rotate through large angles. Yet it
by the spring 3 l.
is an important feature, to provide for a sufficient
The wing also has lift augmenting flaps 32 and
volume of now through the slot in the flap. If a
33, Figures 5, l0 and 11. By providing two flaps
small opening is used the suction or blowing pres
the upper surface is given a still rounder con
sure must be uneconomically high to provide a
tour to reduce the power required by the blower
sufficient
volume.
34.
Even more important, a large opening extend»
The flaps are rotated by means of connecting
ing along the span of the flap provides for a dis
rods 35 and S6 actuated by the cranks 5 and 6.
tributed ñow through the slot which is very im
A push rod llû leads from the bell crank 6 to a
portant for its effectiveness. If the opening were
pilot’s control.
at one end of the flap it would have to be small
The flaps 32 and 33 have an induction slot 3l
and then the flow through the slot is apt to be
and 38, respectively, which are in communication
chiefly through the portion of the slot near the
with the inlet of the blower 34 as shown in Fig
said end. rI‘he easy and obvious place to have the
ures 5 and 10_
opening is at the end of the flap. Then sealing
In still another form of the invention the 'flap
presents no difñculty since the flap can rotate
is both rotated downward and extended rearward
about the center of the duct communicating be
as shown in Figures 12 to 15.
The wing is dla and the flap is 4|. Normally 40 tween the wing and the flap. I have gone con
trary to this precedent and located the communi
the flap is housed within the wing and is slid
cation passage at the front of the flap and pro
rearward by the screws 42, nut 43, and connecting
vided an effective means of doing it.
rod et. The wing carries two T-shaped lugs 45
In the drawings the communication opening
which are situated in a groove ¿E in the top of
exists for the full length of the flap but it may be
the nap and formed in the rib 4l'. The construc
varied or suppressed at certain locations to
tion is similar to that shown in Figure 3a.
change the flow through the slot. I have found
The flap has the two slots 48 and 49 which are
that the area of the opening should be at least
exposed when it is extended. When it is re
greater than one quarter of the area cf the slot
tracted the slots are of course closed or shielded
50 to be successful.
by the upper surface of the wing.
I have disclosed two types of flap arrangements
There is a lower surface nap -50 hinged at 5I
suitable for ailerons or for lift augmentation.
with its outer end borne by a lug projecting into
Either type may be used for either purpose.
'
a chordwise groove formed in the rib 52.
A flap which varies the upper surface of the
The flap is slid rearward by the rotation of the
wing I call an upper surface flap. I use the term
screws d2 turned by the helical gears 53 and 54,
flap for any type of nap. I use the term “lift
the latter on the spanwise extending shaft 55.
flap” to indicate the flap or flaps which are moved
The blower 34 draws the air into slots 48 and
symmetrically on opposite sides of the vertical
t9 and discharges it through slot 56.
plane of symmetry of the aircraft to increase the
Where the flap is rotatable the hinge should
be located below the mean camber line of the wing 60 lift. Flaps with differential motion are control
naps.
- section, This means that the radius of curvature
A point on the w'mg chord situated a distance
of the upper surface just opposite the hinge is
greater than one-half the thickness of the wing
section at the hinge. The value of this radius
in from either the leading or trailing edge equal
to 10 per cent of the chord I call a l0 per cent
should also have an absolute lower limit of 10 per 65
point.
cent of the chord length of the wing section.
In addition to having a wing of high mean
camber it is desirable that its suction slots be
located chiefly in the rear one-half of the wing.
This arrangement will produce the greatest lift for
the least expenditure of blower power.
The customary flap does not provide a suin
While I have illustrated certain specific forms
of the invention it is to be understood that
changes may be made without departing from
- the spirit of the invention and that I intend to
ciently well rounded upper surface on a wing for
efñcient boundary layer control and this is par
1. A wing structure comprising a wing main
body the upper surface of which is defined by a
ticularly true for thin wings. Hence. the type of
curve of a radius longer than the maximum thick
claim my invention broadly as indicated in the
accompanying claims.
I claim:
’ *2,406,918
S
_
6
ness of the wing, a lift‘flap portion having an up
position in alignment therewith forming' a regir'
per surface deñned by a curve of a radius greater
than the thickness of the wing adjacent the end
of said main body, the lower surface of said main
body and of said ñap being closed to through
passage of air from the region below to the region
above the wing in all relative positions of the wing
larly curved lower airfoil surface to a lowered
high lift position at a substantial angle with re
and flap, means enclosed by said wing and flap
for mounting said flap for adjustment about a
radius of less length than the thickness of the
wing at said end of ‘the main body providing for
changing its position Vwith respect to said main
body from a raised high speed position in align
ment therewith forming a regularly curved lower
spect thereto, the forwardly projecting portion
of ‘said upper curved flap surface lapping the
trailing end of said main body in the raised po
sition of said flap, said forwardly projecting por
tion being movable into position closely adjacent
the end of said main body exposing said curved
upper surface thereof when the flap is in lowered
position to provide a substantially continuous
upper curved surface for said combinedl wing and
flap of substantial radii, said combined upper
curved surface of the wing and iiap having a slot
airfoil surface to a lowered high lift position at a
therein in communication with the interior of
the wing in the high lift position of said flap, and
substantial angle with respect thereto, the for
wardly projecting portion of said upper» curved
blower means within the wing for inducting the
flap surface lapping the trailing end of said main
-boundary layer of said upper curved wing portion
body in the raised position- of said iiap, said for
to increase the velocity of air flow thereover.
wardly projecting portion being movable into 20 4. A wing structure comprising a wing main
position closely adjacent the end of said‘main
body the upper surface of which is defined by a
body exposing said curved uppersurface thereof
curve of a radius longer than the maximum
when the flap is in lowered position to provide a
thickness of the wing, a lift flap portion having an
substantially continuous upper curved surface for
upper surface deñned by a curve of a radius
said combined wing and flap of substantial radii. 25 greater than the thickness of the wing adjacent
2. A wing structure comprising a wing main
the end of said main body, the lower surface of
said main body and of said flap being closed to
body the upper surface of which is deñned by a
through passage of air from the region below
curve of a radius longer than the maximum thick
ness of the wing, a lift flap portion having an up
to the region above the wing in all relative po
per surface defined by a curve of a radius greater 30 sitions of the wing and flap, means enclosed by
said wing and iiap for mounting said flap for
than the thickness of the wing adjacent the end of
adjustment about a radius of less length than
said main body, the lower surface of said main
body and of said flap being closed to through
the thickness of the wing at said end of the main
body providing for changing its position with re
passage of air fromthe region below to the region
above the wing in all relative positions of the wing 35 spect to said main body from a raised high speed
position in alignment therewith forming a regu
and flap, means enclosed by said wing and nap for
larly curved lower airfoil surface to a lowered
mounting said flap for adjustment about a radius
high lift position at a substantial angle with
of less length than the thickness of the wing at
respect thereto, the forwardly projecting portion
said end of the main body providing for chang
ing its position with respect to said main body 40 of said upper curved flap surface lapping the
trailing end of said main body in the raised po
from a raised high speed position in alignment
sition of said nap, said forwardly projecting por
therewith forming a regular curved lower airfoil
tion being movable into position closely adjacent
surface to a lowered high lift position at a sub- l
the end of said main body exposing said curved
stantial angle with respect thereto, the forwardly
upper surface thereof when the flap is in lowered
projecting portion of said upper curved flap sur
position to provide a substantially continuous up
face lapping the trailing end of said main bodi7
per curved surface for said combined wing and
in the raised position of said flap, said forwardly
flap of substantial radii, an auxiliary flap for clos
projecting portion being movable into position
ing and completing the continuous outer surface
closely adjacent the end of said main body ex
posing said curved upper surface thereof when the ,50 of said combined wing and flap, and means for
adjustably mounting said auxiliary flap providing
ñap is in lowered position to provide a substan
for movement thereof into closing relation as
tially continuous upper curved surface for said
said lift flap is adjusted from one position to
combined wing and fiap of substantial radii, said
another.
combined upper curved surface of the wing and
5. A wing structure comprising a wing main
flap having a slot therein in communication with .55
body the upper surface of which is defined by a
the interior of the wing, and means within the
curve of a radius longer than the maximum
wing for causing a flow of air through said slot
thickness of the wing, a. plurality of articulated
to increase the velocity of air flow in the boundary
layer on said upper curved surface. .
lift nap elements arranged in tandem, each hav
3. A wing structure comprising a wing main 60 ing an upper surface defined by a curve of a
radius greater than the thickness of the preced
body the upper surface of which is defined by
ing wing or flap section at the trailing ends
a curve of a radius longer than the maximum
thereof, the lower surfaces of said wing main
thickness of the wing, a lift flap portion having
body and of said flap elements being closed to
an upper surface defined lby a curve of a radius
greater than the thickness of the wing adjacent i 65 through passage of air from the region below to
the region above the wing in all -relative positions
the end of said main body, the lower surface
of said wing and iiaps, said lower surfaces in the
of said main body and of said flap being closed
raised position of said flaps being smooth and
to through passage of air from the region below
free of closed bottom recesses, means for hinging
f to the region above the wing in all relative po
sitions of the wing and flap, means enclosed by 70 the foremost fiap element’to said main body
said wing and flap for mounting said flap for
substantially in the plane of the lower surface of
adjustment about a radius of less length than the
said wing, means for hinging a succeeding iiap
thickness-of the wing at said end of the main
element to the preceding flap element in sub
body Vproviding for changing its position with re
stantially the plane of the lower surface thereof,
'spect to said‘main bodyfrom ‘a raised >high Vspeedz
each of said flap elements having a forwardly
2,496,9,1É
projecting portion of a curvature comparable
with that of the normally exposed. partv of the
upper- curved surface of said flap and adapted
to lap the rear end of the projecting section in
the raised position thereof, means providing for
lowering said flaps to respective positions where
said forwardly projecting portions are brought
against the ends of the respective preceding sec
for said combined wing and flap of substantial
radii, said combined upper curved surface of the
wing and flap havingfa slot therein in commu
nication with the interior of the Wing, the for
ward end of said flap being open to provide direct
communication and free flow of air through the
wing interior, and means within the wing for
causing a flow of air through said slot and the
open end of said nap to increase the velocity of
tions thereby providing an upper curved surface
of substantial radius which is substantially con 10 air Aiiow in the boundary layer on said upper
tinuous over said wing and flap elements.
curved surface.
8. A wing structure comprising a wing main
6. A wing structure comprising a wing main
body the upper surface of which is deñned by
body the upper surface of which is defined by a
a curve of a radius longer than the maximum
curve of a radius longer than the maximum thickness of the wing, a plurality of articulated lift 15 thickness of the wing, a lift flap portion having
nap elements arranged in tandem, each having
an upper surface defined by a curve of a radius
an upper surface defined by a curve of a radius
greater than the thickness of the wing adjacent
the end of said main body, means enclosed by
said wing and flap for mounting said flap for
greater than the thickness of the preceding wing
or ñap section at the trailing ends thereof, the
lower surfaces of said wing main body and of 20 adjustment about a radius of less length than
said flap elements being closed to through pas
the thickness of the Wing at said end of the
sage of air` from the region below to the region
main body providing for changing its position
above the wing in all relative positions of said
with respect to said main body from a raised
wing and naps, said lower surfaces in the raised
high speed position in alignment therewith form
position of said flaps being smooth anddree of 25 ing a regularly curved lower airfoil surface to
closed bottom recesses, means for hinging the
a lowered vhigh lift position at a substantial angle
foremost nap element to said main body sub
with respect thereto, the forwardly projecting
stantially in the plane of the lower surface of
portion of said upper curved flap surface lapping
said wing, means for hinging a succeeding flap
.the trailing end of said main body in the raised
element to the preceding iiap element in sub- 30 position of said iiap, said forwardly projecting
stantially the plane of the lower surface thereof,
portion being movable into position closely ad
each of said flap elements having a forwardly
jacent the end of said main body exposing said
projecting portion of a curvature comparable
curved upper surface thereof when the nap is
with that of the normally exposed part of the
in lowered position to provide a substantially
upper curvedsurface of said flap and adapted 35 continuous upper curved surface for said corn
to lap the rear end of the preceding section in
bined wing and ñap of substantial radii, said
the raised position thereof, means providing for
combined upper curved surface of the wing and
lowering said flaps to respective positions where
ñap having a slot therein in communication with
said forwardly projecting portions are brought
the interior of the wing, the forward end of
against the ends of the respective preceding sec« 40 said flap being open to provide direct communi
tions thereby providing an upper curved surface
cation and free flow of air through the wing
of substantial radius which is substantially con
interior, and means within the wing for causing
tinuous over said wing and flap elements, said
a fiow of air through said slot and the open
combined upper curved surface of the wing and
end of said flap to increase the velocity of air
flap elements having at least one slot therein :in
yflow in the boundary layer on said upper curved
communication with the interior of the wing, and
surface.
blower means within the wing for causing a flow
9. A wing structure comprising a wing main
of air through said slot to increase the velocity
body the upper surface of which is defined by a
of air flow in the boundary layer on said upper
curve of a radius longer than the maximum thick
curved surface.
50 ness of the wing, a lift flap assembly including
7. A wing structure comprising a wing main
a plurality of sections arranged in articulated
body the upper surface of which is deñned by a
tandem relation with respect to said wing main
curve of a radius longer than the maximum
thickness of the wing, a lift flap portion having
body, said lift flap sections having portions the
upper surface of which is defined by a curve of
an upper surface defined by a curve of a radius
a radius greater than the thickness of the imme
greater than the thickness of the wing adja 55 diately preceding wing structure, the lower sur
cent the -end of said main body, the lower sur
face of saidvmain body and of said flaps being
face of said main body and of said flap being
closed at the junctions therebetween to through
closed to through passage of air from the region
passage of air from the region below to the region
below to the region above the wing in all relative
above the wing in all relative positions of the
60
positions of the wing and flap, means for mount
wing and flaps, means for mounting said flaps
ing said flap for adjustment providing for chang
for adjustment providing for changing their po
ing its position with respect to said main body
sition with respect to said main body from a
from a raised high speed position in alignment
raised high speed position in alignment therewith
therewith forming a regularly curved lower air 65 forming a regularly shaped lower airfoil surface
foil surface to a lowered high lift position at a
to a lowered high lift position at a substantial
substantial angle with respect thereto, the for
angle with respect thereto, the forwardly pro
wardly projecting portion of said upper curved
jecting portion of said flap surfaces lapping the
nap surface lapping the trailing end of said main
trailing end of the preceding wing structure in
body in the raised position of said flap, said
the raised position of the said ñap, said forwardly
forwardly projecting portion being movable into 70 projecting portions being movable into position
position closely adjacent the end of said main
closely adjacent the ends of the preceding wing
body exposing said curved upper surface thereof
structure exposing said curved upper surfaces
when the nap is in lowered position to provide
thereof when the flaps are in lowered position
a substantially continuous upper curved surface 75 to provide va substantially >continuous upper
9
2,406,918`
10
curved surface for said combined wing and flaps
velocity of air ñow in the boundary layer on said
of substantial radius, said combined upper sur
upper curved surface.
face of the wing and flap sections having a slot
l1. A wing structure comprising a wing main
body the upper surface of which is defined by a
therein in communication with the interior of
the wing, the forward end of the forward flap CPA curve of a radius longer than the maximum thick
section being opened to provide direct communi
ness of the wing, a lift flap assembly including a
cation and free flow of air through the wing in
plurality of sections arranged in articulated tan
terior, and means within the wing for causing a
dem relation with respect to said wing main body,
flow of air through said slot and the open end
said lift flap sections having portions the upper
of said flap to increase the velocity of air iiow
surface of which is each defined by a curve of
in the boundary layer on said upper curved sur
face.
l0, A wing structure comprising a wing main
body the upper surface of which is defined by a
curve of a radius longer than the maximum thick
ness of the wing, a lift ilap assembly including a
plurality of sections arranged in articulated tan
dem relation with respect to said wing main body,
said lift fiap sections having portions the upper
surfaces of which is each defined by a curve of
a radius greater than the thickness of the im
a radius greater than the thickness of the im
mediately preceding wing structure, the lower sur
face of said main body and of said flap sections
being closed at the junctions therebetween to
through passage of air from the region below to
the region above the wing in all relative positions
of the wing and flap sections, means for mount
ing said flap sections for adjustment providing
for changing their position with respect to said
, main body from a raised high speed position in
alignment therewith to a lowered high lift posi
mediately preceding wing structure, the lower sur
tion at a substantial angle with respect thereto,
face of said main body and of said flap sections
the forwardly projecting portion of a said flap
being closed at the junctions therebetween to
lapping the trailing end of the preceding wing
through passage of air from the region below to 25 structure in the raised position of said flap, said
the region above the wing in all relative positions
forwardly projecting portion being movable into
position closely adjacent the ends of the preced
of the wing and flap sections, means for mount
ing said nap sections for adjustment providing
ing wing structure exposing the curved upper sur
for changing their position with respect to said
face thereof when the nap sections are in lowered
main body from a raised high speed position in 30 position to provide a substantially continuous
alignment therewith to a lowered high lift posi
upper curved surface for said combined wing and
tion at a substantial angle with respect thereto,
flap of substantial radius, said combined upper
the forwardly projecting upper portion of a said
curved surface of thewing and said flap sections
ñap section lapping the trailing end of the pre
having a slot in said second ñap section in com
ceding wing structure in the raised position of 35 munication with the interior of the wings the for
said flap, said forwardly projecting portion being
ward end of the rear iiap and both ends of the
movable into position closely adjacent the end of
forward flap being opened t0 provide direct com
the preceding wing structure exposing the curved
munication and free flow of air through the in
upper surface thereof when said flap sections are
terior of the wing structure.
in lowered position to provide a substantially con 40
12. A wing structure as defined in claim 7 in
tinuous upper curved surface for said combined
which the lapping relationship between the flap
wing and flap of substantial radius, said combined
surface and the end of the wing main body is pro
upper curved surface of the wing and flap having
vided by means of an auxiliary covering flap which
at least one slot therein in communication with
forms a continuing convex upper surface contour
the interior of the wing, the forward flap section
when the lift flap is in raised high speed position.
having a communication passage therethrough
13. A wing structure as defined in claim l0 in
for free iiow of air through the wing interior, and
which the ñow is inducted into the wing interior
means within the wing for causing a ñow of air
inwardly through said slot.
through said slot and said passage to increase the
EDWARD A. STALKER.
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