Structural analysis and design of airplanes (1920)
United States. Army. Air Corps · [Washington] · leaf 135
tested with loading 1, Fig. 76. Some of them were constructedwith the spruce-poplar plywood recommended, and the balance with anall birch plywood of the same thickness. The first type weighed 15 to\SJ/2 oz. unvarnished, and carried an average ultimate load of 600 lbs.Those with birch plywood… … 116 Art. 89 Rib Loading ever, the latter were considerably lighter and developed all the strengththat could be utilized efficiently. Beyond a certain point additionalstrength is of no value. All the diagonal reinforcing was 3/16 x 3/16 in.spruce, except the diagonals adjacent to the spars on the…
Airplanes
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