Progress reports on experimental metal spars (airplane section report)
Niles, A. S., Jr.
Friel, E. C.
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DescriptionLate in 1924 a series of "Standard loading conditions" were formulated by the Engineering Division for use in comparing the merits of different types of metal wing-spar construction and published in Serial Report No. 2450. Early in 1925 a circular proposal was sent to the industry calling for bids on designs of metal spars for the "Single-bay observation" loading of this report. Several of the designs submitted in response to this circular were purchased, and these spars as well as several others have been tested by the division. This document is a progress report giving the essential data obtained from the tests made to date. The principal subjects will be the progress made to date, the present status of the project, proposed developments, and a discussion of certain auxiliary questions that have arisen in connection with the tests.
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