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Sept- 10, 1945‘
R. MONTGOMERY ET AL
2,407,514
STRUCTURE FOR SUPPORTING FUEL TANK IN AIRCRAFT WINGS
Filed July 3, 1943
‘ 5 Sheets-Sheet 1
432%.
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SéPt- 10, 1946-
R. MONTGOMERY ETAL
‘2,407,614’
STRUCTURE FOR SUPPORTING FUEL TANK IN AIRCRAFT WINGS‘
Filed July 3, 1943
5 Sheets-Sheet 2
mmNu!
INVENTORS
Robert Montgomery
George W. Schcmzi
BYdytvwkTa
. T
A TTORNE Y
Sept. 10, 1946.
RQMONTGO'MERY ETAL
2,407,614
STRUCTURE FOR SUPPORTING FUEL TANK IN AIRCRAFT WINGS
Filed July 3, 1943
5 Sheets-Sheet 3
}
INVENTORS
Robert Montgomery
I
CreorqeI/V“Schemev
“31%; 75.1‘
ATTORNEY
-
Se5t.10,~1946.
' MONTGOMERY Em;
2407,6114
STRUCTURE FOR SUPPORTING FUEL TANK IN AIRCRAFT WINGS
Filed July 3, 1943
5 Shéets-Sheet. 4
Q
s iai-i i‘
INVENTORS.
Robert Montgomery ‘
George W‘. Schcme.___
BY
TM.
A TTORNEY
7 Sept. 10! 1946.‘
' R. MONTGOMERY 51' AL
2,407,514
STRUCTURE FOR SUPPORTING FUEL TANK IN AIRCRAFT WINGS
Filed July 3, 1943
5 Sheets-Sheét l5
INVENTORS.
(i0 bert Montgomery I
GeorgeW. Schcme
Patented Sept. 10, 1946
2,407,614 I
UNITED STATES PATENT orricr.v
,
2,407,614
sTRUcTURE FOR SUPPORTING FUEL TANKS
.
IN AIRCRAFT WINGS
Robert Montgomery and George W. ,Schane,
Philadelphia, Pa., assignors ‘to The Budd Com
pany, Philadelphia, Pa, a, corporation of Penn
syivania
Application July 3, 1943, Serial No. $93,378 ‘
7 Claims. (Cl. 244-123)
1
This invention relates to ‘aircraft, structures,
2
‘ tion rib, the View being
V
taken on the line 1-1 of
» particularly to the Wing structure of anairplane
Fig 4;
in the region of a removable fuel tank, and has
for an object the ‘provision vof improvements in
‘this art.
"
t
t
Another object is to reinforce the wing struc"
'
the view being taken on the line 8.—-8 of Fig. 4; V
‘ one of the particular objects of the invention
is to provide a‘ sturdy mounting for a fuel tank
of large capacity in the wing of an aircraft.
_ Aliiother. vobject is to provide a removable
fuel
tan 1.
.
g
Fig. 8 is. a partial enlarged vertical spanwise
section of the upper skinblanket and nose rib,
Fig. 9 is a partial enlarged horizontal section
through the rear spar and the adjacent portion
of the main-section rib, the view being takenon
' the line 9—.-9 of Fig. 4; and ‘
10
ture to compensate, for the omission of usual
Fig. 10 is a sectional perspective view of the
nose section, the view being taken in approxi
mately the same region as Fig, ’3.
structural members in the space Occupied by the
tank.
‘
The wing in‘ ‘which’ the tank is mounted com
prises a nose or leading edge section N, a main
Another object is to provide a strong frame for 15 or central section M, anda trailing section T.
the opening through which the tank passes dur~
Only a very small part of the trailing section is
ing insertion and removal.
shown
herein. The main section lies between a
, Another object is to provide ‘arig'id closure for
front spar-like structure F and a rear spar R. '
the opening and to ?rmly anchorvt'he closure
Strictly speaking, the entire nose section con“
the opening '50 that it acts as an effectual struc 20 stitutes the front spar {but the chord-strut struc~
tural unit with the ‘?xed structure. ’
ture which exists at the usual 'front spar location
Another objectis to provide nose section struc~
maybe referred to‘ as a spar-like formation. The
ture which ‘effectively substitutes for interchord
front spar-like structure is comprised of upper
struts in the nose or leading edge of the wing,
and‘low'er span'wise extending L‘-section chords 23
Another object is to provide ribs which furnish ' and interispar struts (not shown but located. be,
a convenient and secure anchorage for tank-sup
porting means‘.
tween the‘ch‘ords at points other than the'tank
.
region, which is herein shown). The struts are
>_ ‘ Another object is to effectively transfer skin
not shown because the ‘front end of the tank 25
blanket loads across the tank region.
The enumerated and other objects of the in
vention will “be apparent from the following deé
30
place of the omitted struts‘. ‘ The rear spar R in
scription Iofan ezieinplary embodiment of the in
Icludes'a web 22', upper and lower L-chords 23,
vention, reference being made to thelaccompany
ing drawings thereof, wherein:
extends through the ‘line where the struts ‘would
be located, and other structure is “provided in
and vertical sti?‘ener struts 24. I
I ’
V
,
The wing, in addition to thespars F and‘ R,
includes (Figs. 1 and 2) other frame elements in
Fig. 1 is a top plan view of the nose and center
sections of an airplane wing in the tank region;
Fig. 2 is a corresponding bottom plan view;
section ribs 35. A small part of one of the main-'
_ Fig. 3 ‘is a vertical chordwise section through
the wing structure with the closure or door re
channel section cap strips or chords 30a, a com- 7
moved ‘and the tank in process of being inserted,
the view being taken on the ‘line 3-—4 of ‘Fig. 1;
Fig. 4 is a similar vertical chordwise section’,
also taken on the section line 3—4 of‘Fig. 1, but
showing the tank and door in ?nal assembly po
sition;
_
‘5 is ‘aside elevation of “a main-section rib
elementremoved from the Fig. 4 ‘assembly to show
its structure alone‘;
n
‘ ‘ .
the form of main-section ribs 30’and aligned nose
section ribs 30 is shown in Fig. 6. It comprises 2
.40
plete web .301), and stiffening struts 300., The
wing includes anu-pper cover or skin blanket 46,
a lower cover or skin blanket 50, and a ‘nose cover
or skin blanket B0.
. _ ‘
‘
g
The nose blanket 50 is shown ‘to be ‘made up of
' an upper portion Sea, a lower ‘portion 60b, and a
‘front closure portion 600. Theskin portions are
‘connected ‘by ‘splice strips 5i.‘ In ‘addition to‘the '
‘skin sheets proper, the nose blankets 60a and 60b
‘ Fig. '6 is a partial enlarged vertical ‘spanwise
comprise through-running stringers B2.
section of the lower skin blanket at the door and
frame joint, the view ‘being taken ‘on the line vt'--t
‘ The main section‘rskin‘blankets 4,0, ‘59, besides
the skin sheets proper, comprise Y-bulb stringers
ill toward the front and rear edges,‘hat-'shaped
Channel-?anged stringers 42 in the middle, and
heavier 'hatlsha‘ped border "stringers 43 at vthe ex
of Fig. "2;
Fig. "7 ‘is a “partial enlarged vertical spanwise
section "of the upper skin blanket and ‘maina'se'ci - ‘trem’e "frontand rear ‘edges. In theregions or the
2,407,614
3
Y-bulb stringers 4| the skin blankets are pro
vided with clips 44 for adjustable connection to
the ribs; and in the region of the hat-shaped
stringers 42 the blankets are provided with
?anged clip strips 45 for adjustable connection to’
4
running stringers 52. The inner ?angededges
are arcuately recessed, as at 36d to fit the front .
end of the tank 23.
-langed lightening holes 336
are provided in the webs. The webs are connected
in box-like fashion near, the upper edge by two
channel-shapedbars 361‘, 35g and near the lower
edge by two channel-shaped bars 3671;, ‘35k. At
thegupper projecting ends the webs are further
ably altered, though the general representation
connected by a terminal channel-shaped spacer
of parts remains the same as in typical portions
36m which at the front edge is welded to the
of the wing. Thus there are main ribs, but they 10 upper spar chord 20. A similar channel-shaped
are made heavier, of di?erent shape, and divided
spacer 361i is welded between the webs near the :
differently; there are nose section ribs, but they
mid-height but disposed with the open side out
are made heavier, of double web's, interconnected
ward. A bolt 3'5 passing through a hole in the '_
the
ribs.
"
V
'
'
,
In the tank region the structure is consider
and reinforced, and recessed on the rear end to
webs 36a and the bar 3% serves as anchorage for
?t the front end of the tank; and the front spar 15 a tank supporting strap 33, Flanged clips 39
like formation is Present onlyin the form of the
attach the webs 36a to the lower spar chord 20.
upper and lower'chords which are'conn‘ected at
The lower ends of the webs extend beyond the
spaced points by the nose ribs instead‘ of by the '
typical inter-chord struts. A portion of the lower
spar chord 28, as does also the end of the bar '
skin blanket is omitted‘to form an opening in 20 36h, to partly underlie the tank 25 andto serve
sufficient size to pass the tank ther'ethrough. This
opening is heavily reinforced around its marginal
edges. _ And a. strongly. constructured closure or
‘as anchorage for the closurejfor the lower skin
' blanket opening. . The opening'is designated as
‘EB and the closure ‘or door as 89. > I
.,
The forward ends of the rib-‘strut webs 3hr,
door is provided to ?ll the opening and form, a
or
splicers thereof ,as, shown straddle. andare
25
rigid continuation of the'skin blanket and ribs
welded to the nose rib webs 33a, 1
g '
_
across the opening. Speci?cally the construc
tionis as follows:
I
'_j
" ‘
‘
' '
‘
A'third strap member ,63 ?lls the, space 110e,;
tween the ‘strap members 33 _andij33 'and'the
‘ Referring to Figs. 3,
straps are tightened on the tank by clamp bolts
rearfspar It and theupper chord 2!] of the front
64 secured between projecting spaced lugs 65' on
spar F at. every- ribiTstation there ' is‘ disposed and’ 30
4,5,
.7, andIQ, between the ~
_
secured an L-shaped'rib-strut member 38, r This
is a double-webbed me'mbercomprising the par~
allel' plate web'sv 31a}? outer web-connecting ex
teriorly-‘?anged channel members 31b (horizontal v
or rib)’ and 3,lc’(vertic‘al or strut), an inner web
connecting . channel . member 3ld for the upper
- longlor .rib L-arm of the rib-strut, transverse
stiffening " elements 31a for the upper long or
rib L-arm, nestedangle-section reinforcing ele
ments 3lf for thevertical short L-arm near the
lower end, and inclined stiffeners 3 to in the crotch
of the L. The L-shaped rib strut'3l is madewid
est in the crotch, and diminishes. toward the ends
‘in 7cantile'ver fashion, and interiorly iscurved to
?tthe' top and. the upper portion of one end of
thetan'kl?. ‘:As shown ‘i'nFi'g. 9;‘ the ?anges of
theF'channel-shaped vertical orstru't member Bic
the straps.
.
‘
'
v
j
‘
.
.
,
The bottom opening 'lll’is suitablyreinforced
around its edges. At the front edge (Fig. 3)‘ an
L-shaped chord ‘H ‘is secured by welding and also
by bolts 12 to the lower spar ‘chord 10;’, At the
‘ nose ribs opposite the "clips 39 other clips 13 are
provided and the bolts ltexten'd through the
?anges, of both clips 39 and‘13‘as well as'the
> chords, 2!) andfH. Above the" chords, the" clips ,3?
and ‘I3 are-secured together through their‘?anges
by bolts 74, An outer plate l51is ,w'e'lded across /
the outer?anges of the ‘chords ,2U“and"'|‘l.
At the rear edge‘ of the opening an Leshaped
chord 13 is welded to the lower chord '23 of the
rear spar and a marginal'plate v‘I’! is welded to
the outer ?anges of the chords‘ 23__and 'HiLThe r
lower end of the strut’portion of the rib-strut .
member 3! is welded in with‘the chords 2'3 and 16
are welded .to the web .22-~of thefreaipfspar, the
nestingélements 31f valsolbeing welded in where
present, and one ?angeof the spar stiffening strut 50 At the ends (Fig. 6) the stringers, 4!, 42, are
reinforced by embracing end __members Makin
24 also being welded?inlwhere ‘present.’ The outer
here.
corner of theL-shaped member 3| is provided ,
.
'
.
.
.
"
“
terior projecting plates 18a,;outer plates 18b,-v and
Z-section' chords 'Hlwelded through their ?anges
with anupwardprojection 3m to connect with
the upper chord 23' of the rear'sp'ar and ?anged
reinforcing plates 3 lie are ‘welded to the webs 31a
to, the plates 18a and'iSb respectively.
‘ '
I The closure or door 30 comprises a. section of
here. Also in .the corner, ?anged reinforcing
cleats 3lm are welded to the sides of the webs at
athrough-hole for ‘a bolt 32 which anchors a
tank-securing strap 33. The long arm of the rib
ginal hat-shaped stringers >43, ‘rib chord elements
strut member 3|, that is the rib portion thereof,
is connected to the upper skin blanket as usual
for the typical ribs. by the clips “and the ?anged
strips,45.. This is shown in Fig, '7. .
~
, V - .
A typical nose. rib 35 is shown in Fig. 10. It
consists ofafskeletonized ?anged web35a and
one or more l'connecting struts 35in The rib‘
shown here is an intermediate ‘orfsecondary nose
rib, the typical noseribs which fall in alignment
the ‘lower skin blanket 59, including, Y-bulb
stringers 4 I, middle hat-shaped stringers 4l2,_'mar
5!, connecting clips ?i'and‘clip strips 4-5.; '
At the front and rear edgesVKFigtBl
door
is reinforced by L-shaped chords'52 and outer
?at plates 53. Flanged end c1ips54 ‘are'swelded '
to the rib elements 5!,‘ to the‘string'e'rs' 43, to
the chords 52, and to ‘the skin
the flat
plates 53.
'
‘
'
At the ends'lFig; 6)"the‘ edge ‘reinforcement
‘of the door is similar to thatiat the‘ edge of ‘the
opening. .Thus there are stringer embracingen'd ,
with the typical-main section ribs’ 33 being some- e members Ma, innerplates 56a, outer-projecting
what heavierybut it serves to show the general 70 plates 56b,‘ and. Z-sectioned-chords 571;. welded
through their ?anges to .Y the platesi?m??b.
character of the typical ribs.
The aligned ribs 36 of the nose-section com
- prise a’ pair of parallel flanged webs 36a and
stiffening struts 33b, Theouter ?anged edges
are notched, as at 350, to receive the through
The rib chord elements (Fig. 6) comprise the
spaced parallel side webs 51a, outer ?angedychan- ,
nels 5H). and inner channel memberf?ilch "
As shown in Figs. é-and 6, the door is ‘ec'ured
5
2,407,614
by short bolts 8| which pass through the- outer
projecting flanges of the nested'marginal chord
members, and long bolts 82 which pass through
the marginal plates of the door and the project
6
viding conjointly the interior opening for a tank,
a tank secured therein, and means for securing
said closure in said opening to form a rigid con
tinuation of the wing structureacross the open
ing end of the bar members 3% (at the front
ing, said opening extending through, the wing
edge) and inserted anchorage clips 83 -(at the
surface on one side and being provided at the
rear edge‘). The short bolts 8| are located at
surface with angle-strip framing and flat outer‘
short intervals entirely around the door and the
border plates, said closure being provided with
long bolts t2 are located at the ribs.
nesting angle-strip framing and flat outer border
As shown in Fig. 1. a ?lling opening, closed 10 plates, and said securing means ccacting with
by a removable cap 84, is provided in the top
said angle strips and flat border plates.
of the wing; and, as'shown in Fig. 2, a sump
3. A wing construction for carrying a remov
opening; closed by a removable cap %5 is provided
able tank, comprising in combination a main .
in the bottom of the wing.
section comprising rib elements and stringer
As shown in Fig. 3, the tank 25 is inserted by
reinforced skin blankets secured thereto, the ribs
5
!
pushing itsfront end upward and forward over
the projecting parts until it seats in‘the arcuate
and skin blanket of a portion of the bottom of
the wing being removably, ?tted as a closure in
a tank-passing opening, a nose section compris
ing nose ribs and a skin blanket thereon, said
of the rib-strut members. The tank straps 33, 20 nose ribs and main section rib elements providing
38, and 63 are then connected by the bolts 64.
‘ conjointly the interior opening for a tank, a tank
Thereafter the closure 86. is placed in the open
secured therein, and means for securing said
ing and secured by the bolts 8 l, 82.
closure in said opening to form a rigid continua
The rigid reinforced frame of the bottom open
tion of the wing structure across the opening,
ing, the rigid structure of the body and rein
said opening extending through the wing surface
forced frame of the door and the numerous se
on one side and being provided at the surface
curing bolts insure that the wing across the
on the front and rear edges with L-shaped frame
opening is as strong as it is elsewhere. Also the
members, on the ends with Z-shaped frame mem
double web ribs and the cantilever construction
bers, and on the outside with ?at border strips,
of the rib-struts insure that the interior frame 30 said closure being provided with nesting framing
here is as strong as it is in adjacent parts of the
of corresponding shape and flat border plates,
wing.
and said securing means coacting with said frame
It is thus seen that the invention provides
members and ?at border plates.
ample space within the wing for a tank; that
4. A wing construction for carrying a remov
the tank can be inserted and removed apart from
able tank, comprising, in combination, a main
the wing assembly; and that the wing in the tank
section comprising rib elements and stringer
region is substantially as strong as in adjacent
reinforced skin blankets secured thereto, the ribs
regions.
and skin blanket of a portion of the bottom of
While one embodiment of the invention has
the wing being removably ?tted as a closure in
been described to illustrate the principles of the
a tank-passing opening, a nose section comprising
invention it is to be understood that the inven
nose ribs and a skin blanket thereon, said nose
tion may have various embodiments within the
ribs and main section rib elements providing con
limits of the prior art and the scope of the sub
jointly the interior opening for a tank, a tank
joined claims.
secured therein, and means for securing said
What is claimed is:
closure in said opening to form a rigid continua
1. A wing construction for carrying a remov
tion of the wing structure across the opening, said
able tank, comprising, in combination, a nose
opening extending through the wing surface on
section, a main section, a front spar-like struc
one side and being provided at the surface fram
_ture between said sections, a rear spar behind
ing, the ribs of the upper part of the main sec
the main section, nose ribs recessed on the rear
tion being extended down at the rear end of the
end adjacent the front spar structure, a tank
main section as struts to the lower part of the
?tting the recessed ends of the nose ribs, the
wing and being connected at the lower end to
front spar structure being open intermediate its
the frame members of the opening.
edges in the tank region to permit the front end
5. A wing construction for carrying a remov
recesses in the rear of the nose ribs.‘ Then its
rear end is pushed up to fit in the curved crotch
of the tank to extend therethrough, one or more *
L-shaped rib-strut members secured to the front
of the rear spar and extending across the top of
the main section and being connected to the nose
ribs at the front end, an upper skin blanket se
cured to said rib-strut members, the rear end of =
the tank ?tting a shaped portion on the inside
able tank, comprising, in combination, a main
section comprising rib. elements and stringer
reinforced skin blankets secured thereto, the ribs
and skin blanket of a portion of the bottom of the
wing being removably ?tted as a closure in a
tank-passing opening, a, nose section comprising
edge of the rib-strut members, straps carried by
nose ribs and a skin blanket thereon, said nose
ribs and main section rib elements providing con
said nose ribs and said rib-strut members sup
porting said tank, and a closure secured in a
jointly the interior opening for a tank, a, tank
secured therein, and means for securing said clo
tank-passing opening in the lower part of the
sure in said opening to form a rigid continuation
Wing.
of the wing structure across the opening, the tank.
securing means including suspension straps at
tached at their upper ends to the upper portion
'
2. A wing construction for carrying a remov
able tank, comprising, in combination, a main
section comprising rib elements and stringer
reiniorced skin‘blankets secured thereto, the ribs .'
and skin blanket of a portion of the bottom of
the Wing being removably ?tted as a closure in
of said ribs.
.
6. A wing construction for carrying a remov
able tank, comprising, in combination, a main
section comprising rib elements and stringer
a tank-passim1r opening, a nose section compris
reinforced skin blankets secured thereto, the ribs
ing- nose ribs and a skin blanket thereon, said
and skin blanket of a portion of the bottom of the
nose ribs and main section rib elements pro 75 wing being removably ?tted as a closure in a tank
2,407,614
7
passing opening, a nosesection comprising nose
ribs and a skin blanket thereon, said nose ribs
and main section rib elements providing con
jointly the interior opening for a tank, a tank
secured therein, and means for securing said clo
sure in said opening‘ to form a rigid continuation
of the wing structure across the opening, said
8
- '7. A wing construction comprising, in com- ‘
bination, an interior frame and upper and lower
skin blankets, the blankets including spanwise ex
tending stringers, the frame comprising front and
rear spar means and rib elements secured thereto
and having an interior tank space and the lower
skin blanket having an opening, a tank disposed
in said space, the tank being insertable through
said opening, said opening having a reinforcing
one side and having its front and rear edges at
the wing surface reinforced by angular spar 10 frame, and a closure for said opening forming a
‘ opening extending through the wing surface on
continuation of. the skin blanket and having
chords, by angular frame members secured there
stringers forming a continuation of the skin
to, and by ?at border strips on the outside, the
blanket stringers and rib elements forming a con
opening having its end edges reinforced by
tinuation of said frame rib elements, and said 010.
stringer-embracing elements, by ?at plates on
the inside and outside, and by Z-section members 15 sure having a reinforcing frame, the reinforcing
frame at the ends of the opening and the closure
whose ?anges are secured to the ?at plates, the
comprising members embracing the ends of the
closure being reinforced on its front and rear
stringers, outer and inner plates secured to oppo
edges by angular frame members and by ?at
site sides of the skin blanket, and Z-shaped mem
border strips on the outside, the closure having
its end edges reinforced by stringer-embracing , bers secured through their ?anges to said plates.
elements, by ?at plates on the inside and outside,
ROBERT MONTGOMERY.’
and by Z-section members whose ?anges are se
GEORGE W, SCI-IANE.
cured to the ?at plates, and said securing means
coacting with said reinforcing means.
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