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N.A.C.A. Technical cmorandum io. 341
breaking test, a load multiple of only 6.5; according to the
United States specifications, 8.5; according to the French
specifications, 6.7; according to the Italian specifications,
10.3.
"You see how widely the strength requirements differ in
the different countries for this relatively weak and not very
efficient airplane. It is still worse in the case of an effic-
ient modern single-seat pursuit plane of 300 HP. For instance,
the Italian Piaggio single-seat pursuit plane, a low-wing can-
tilevor airplane which I will discuss more minutely in my lec-
ture, should have, at the breaking point, according to the
1918 3B.L.V., a load multiple of 6.5; according to the United
States specifications, 8.5; according to the French specifi-
cations, not less than 14.9; according to the Italian specifi-
cations, 10.5. As a matter of fact, the breaking test with
this airplane showed a strength of 18 times the normal load.
In any case, therefore, this airplane is much too strong,
i.e., iuch too heavy." (This airplane has recently been re-
constructed on this account.)
"The case is different for very large airplanes. For in-
stance, the Caproni three-engine airplane,- type 3, has an ac-
tual wing strength of 6.12 times the load, while the French
specifications require only 3.2 for an airplane of this kind,
i.e., less than the 1918 B.L.V.
"Thec French doubtless have the greatest strength require-21
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Baumann, A. Strength Calculations on Airplanes, report, December 1925; (https://digital.library.unt.edu/ark:/67531/metadc65144/m1/22/: accessed April 22, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.