US1713749A - Truss having a plurality of struts for the wings of aeroplanes - Google Patents

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y 1929- c. DORNIER v 1,713,749

TRUSS HAVING A PLURALITY OF STRUTS FOR THE WINGS OF AEROPLANES Filed May 12, 1927 0 y b I f c f Fig". Z.

l I J fi'c' ffc" \f'fic a F I J lnventor: CPorNI'ER Patented NITED STAT CLAUDIUS DORNIEB, 0F FRIEDRICHSHAFFJW-ON-THE-IBODENSEE, GERMANY, ASSIGNOR T0 DORNIER-METALLBAUTEN Gr. M. 3.. H., 0]? FRIEDRICHSHAFEN-ON-THE-BODEN- TBUSS HAVING A IPLURALITY 0F STRUTS FOR THE WINGS OF AEROPLANES.

Application filed May 12, 1927, Serial No. 190,879, and in Germany June 14, 1926.

This invention relates to an aeroplane wing having a plurality of struts and to its connection with the body. The supporting plane comprises a relatively thick central beam and two thinner front and rear beams. The central beam serves as a main girder and in normal flying has -to bear about half thetotal load. Theother two beams can therefore be placed a considerablefdistance forward or rearward, because the web depth then still available in the wing cross section is still sufiicient to stand high stresses. By this enlargement and subdivision of the distance between beams a construction is practicable with lighter wing ribs than would be necessary in the arrangements with only two beams. In addition, this arrangement of three beams presents the possibility of effecting the connection of the main beam in the centre with the body exclusively by means of tensile members, while the compression and tension resisting connections of the two other beams connectingthe wings with the body are thereby relieved to a substantial extent. Owing to the greater'distance of the outer beams from the centre of the wing, moreover, by the alteration in the torque of the air forces during variations in angular position, only relatively small forces act upon the outer beams and their connection with the body, owing to the increase in the length of the lever arms.

A further advantage of the invention is obtained if the lateral supporting struts between the wing and the body are not attached to the wing at the same distance from the central plane of the flying machine. The forces reaching the beams are then diminished owing to the fact that the smaller lever arm brings about a relieving of the adjacent beams through the medium of the wing ribs;

The essential features of the invention are illustrated in various constructional examples in the accompanying drawings, wherein Figure 1 shows in section awing a with three beams. The central beam 6 is connected by a cable 0 with the body, which in this fig ure has been omitted as unnecessary. The front and rear beams d and e are supported fromthe body by struts In Figure 2 the wing a is again secured to the body 9 by struts or cables ,1 and c. The lateral supporting struts f and 0, which are preferably likewise attached to the beams, here lie in one plane.

In the case of the construction according to Figure 3 the struts f and 0' do not coincide in front elevation, but their points of attachment to the wing do not lie at equal distances from the central lane.

What- I c aim is 1. A supporting wing for aeroplanes comprising a main cross beam and two auxiliary cross beams, a tension member capable of resisting tensile forces only connected to the main cross beam and struts capable of acting both as pressure.and-tension members connected to the auxiliary cross beams, as set forth. 7

2. A supporting wing for aeroplanes as set forth in claim 1 and having in addition lateral struts capable of acting both as pressure and tension members connected to the main and auxiliary cross beams at pointsiwhich are not at equal distances from the central plane of the wing, as set forth.

In testimony whereof I have signed my name to this specification.

CLAUDIUS noanmn;

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