A major area that was upgraded from the original design was the fuselage. The Douglas World Cruiser of 1924 was a redesign of the Douglas DT torpedo bomber. Part of that redesign was a move away from wire-trussed wood construction to an all-tubing assemblage with some adjustable metal tie rods. We've replaced the tie rods with tubing. Ease, cost, strength, as well as reliability of modern materials and methods, motivated this use of a unified fabrication approach.
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