US1712812A - Wing for aircraft - Google Patents

Description

y 1929- A. E. 1.. CHORLTON ET AL 1,712,812

v WING FOR AIRCRAFT Filed July 16, 1928 naslr .tltlLAN ERNW'JL LEUFRIC CHORLTOI T, ROLLO AMY-MEET DE HAGA I-IAIG, AND HELMUI JUHN STIEGER,0F L0NDQI i IENGLAND.

WING non Atacama.

Application filed July 16, 1928;, Serial No. 293,094, ariddzr Great Britain December 5, 1927.

This invention relates to wings for aircraft, and more particularly to' cantilever wings in whicha spar or spars projecting from a fuselage support the wing formed around such spar or spars.

Spars employed as cantilevers in monoplane wings, are required to take not only the stresses due to the vertical and horizontal bendingmoments and combinations of these stresses, but also torsional stresses which .tend to twist thev wing, and this has necessitated the employment of a spar or pair or spars of considerable width, Which,owing to the limitation of wing depth, have been dificult to brace satisfactorily against torsion stresses.

According to this invention, a-spar is constructed of a depth. permissible by the thick ness of the wing and of any convenient width. Atsuitable positions along thespar opposed pyramid-bracings orv staying bays through the spar.

: and

are formed projecting fore and aft from the spar with thebases of the pyramids coinciding. The apices of the pyramids are heldapart by struts passing transversely Two pairs of tension members form the edges of each pyramid and connect the apex of the pyramid to the upper andlower booms or members ofthe' spar. i i v In the accompanying drawings: Figure 1 1s a dlagrammatlc section oi: a wing of an aircraft containing a spar con- 'structed in accordance with this invention.

Figure 2 is adiagrammatic perspective view of the same spar.

The spar is illustrated in girder form, A being the u per boom, B being the lower boom and 6 representing the web of the girder. The pyramid bracings will be seen to form staying bays on opposite sides of the girder and are composed of struts D, D.

--The tension members are illustrated in pairs E E and F, F forming one bay,

(id and H, H forming the opposite ba l 'lhe strut D passes through an aperture C in the web O and is thus free and unconnected to the web 0, or tothe spar, except through the tension members E, E F, P, G, G H, H

The tension members are illustrated in the drawings aswires, but it is obvious that tubes or other more rigid connections may be used-in the place of the said wires.

to take bending K isa longitudinal wire connecting the ends of the struts D of the spar on one side tl1ereof,and L is a similar wlre connecting the other ends of the struts D on the opposite side of the spar.

The struts which maintain the apices of the pyramids apart, may be formed by straight-poles or triangular frames, and when the centres of the pyramids coincide with the ribs or with frames arranged in the direction of the chord of the Wing, such ribs or frames may be utilized after being,

suitably strengthened for supporting the apiceso'f the pyramids and taking the tension of the tension members located on the tension members are convenientlymade-of wire, and it will be clearly recognized that the tension members comprising the bays nearest to the fuselage will be required to support greater stress than the wires comprising tension members in the outer bays away from the fuselage. The thickness of: the wires should therefore be chosen in accordance with the distance of the bay from the centre of the machine, larger gauge wires being used near'the fuselage and less gauge wires'being used in the outer. bays.

What We claim as our invention and de sire to secure by Letters Patent is l. Cantilever spars for aircraft adapted stresses and torsional stresses, comprising in combination, upper and lower booms, a web-attached to and holding such booms apart, and pyramid bracing-s constituting bays on opposite sides of the girder, each opposed pair of bays consisting of a compression member passing stresses, comprising in combination, upper and lower booms, a web attached to and holding such booms apart, and pyramid bracings, constituting bays on opposite sides of the girder each opposed pair of bays consisting of a compression member passing transversely through the said web, and four tension members connecting each end of ..lo I

each boom such separated points being 1osuch compression member to the booms.

3. Cantilever spars for' aircraft adapted to take bending stresses and torsional stresses, comprising in combination, upper and lower booms, a web attached to and holding such 'boom's apart and pyramid bracings constituting bays on opposite sides of the girder each opposed pair of bays consisting of compression supports projecting on o posite sides of the girder and tension mem rs connecting the apices of the compression supports to twoseparated points on cated on the booms on opposite sides of a plane containing both apices and perpendicularito the main axis of the spar.

to take bending 4.-'Cantilever spars for aircraft adapted stresses and torsional stresses, comprising in combination, upper and lower booms, a web attached to'.and holding such booms apart, and. pyramid braoings constituting bays on opposite sides of the girder each opposed pair of bays consisting of struts passing transversely through the web of the spar and projecting on o posite sides of the girder, and tension mem rs connecting the opposite ends of the said strut to separated lnts oneach boom.

5. Cantilever spars or aircraft adapted to i take bending stresses and torsional stresses, comprising in combination, upper and lower booms, a web attached to and holding such booms apart, and yramid bracings constituting bays on opposite sides of the girder each oppoM pair of ba consistingof-struts passing transverse y and freely throu h the web of the spar and proand tension mem rs connecting theopposite ends of the said strut to separated I points on each boom.

In witness whereof our hands.

ALAN ERNEST LEQI'IIC noun Ann-r a. IAGA lmc. llI-ILIUI 10ml 5mm.

46 jecting on t e op ite sides of the girder,

we have hereunto set

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