Author states: "In the 1920s, the technical evidence favored neither wood nor metal overall. Technical criteria thus cannot explain the aviation community's enthusiastic support for metal construction. In addition to technical arguments, supporters of metal invoked a nontechnical rhetoric that linked metal with progress and wood with stasis. Using this rhetoric, aviation engineers expressed their belief in the inevitable triumph of the metal airplane, a belief I term the progress ideology of metal. This ideology insured that research and development resources went overwhelmingly to improving metal airplanes".
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