The Art of Aviation: A Handbook Upon Aeroplanes and Their Engines with Notes ... by Robert Wellesley Antony Brewer

Author:Robert Wellesley Antony Brewer
Language: eng
Format: epub
Publisher: C. Lockwood and son
Published: 1910-03-25T05:00:00+00:00

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DETAILS OF SPAR ATTACHMENT

131

Perhaps the average reader has not considered the stresses which come into play in a monoplane of the Bleriot XI. type when in flight. Suppose the wings were unstayed by guys, they would then act as cantilevers, and would be subjected to the greatest bending moment where they are attached to the fusilage. No ap I

preciable bending, however, occurs here in practice, and no provision is made for resisting such stresses, practically the whole of the lift of the wings being transmitted to the fusilage by two flat steel tension bands fixed between the front main spar of either wing and the lower part of the chassis, these bands being 15 mm. broad by I'S mm. thick, as shown in the figures of the machines. The lift from the rear main spar is transmitted by the gauchissement flexible cables to the lower steel A frame attached to the chassis below the aviator's seat.

In addition, however, to the lifting stresses we have a certain proportion of direct lift and direct drift producing a shearing stress in the end of the front main spars where they fit into their sockets, and the two rear main spars tend to close in towards one another due to the drift produced

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