My drawing in the vector format (not auto trace/copy) of The Dornier Do-X Flying Boat 1929.
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The Dornier Do X was the largest, heaviest, and most powerful flying boat in the world when it was produced by the Dornier company of Germany in 1929. First conceived by Dr. Claudius Dornier in 1924, planning started in late 1925 and after over 240,000 work hours it was completed in June 1929.
Source of the Dornier public domain reference image used is:
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