Horten H IX V3
Artisans have built airplanes with plywood since well before World War I because crossing each layer, or ply, counters the weakness of a single sheet when bent with the grain rather than across the grain (Melvin Wachowiak /Smithsonian MCI photo).
Image Number: WEB12023-2011
Credit: National Air and Space Museum Archives, Smithsonian Institution
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