Background and Design
Trunk deck ships were influenced by (some would say copied from) turret deck ships. In 1892, the Sunderland, England firm of William Doxford and Sons Ltd. built its first turret deck ship. Inspired by U.S. whalebacks, one of which had recently visited Liverpool, Doxford built a ship which had a curved hull form which was stepped in above the waterline. The narrow part of the hull, called a turret, was part of the hold.
Four years after the first turret deck ship, the first trunk deck ship appeared. SS Trunkby, completed in 1896, was built by Robert Ropner at his shipyard at Stockton-on-Tees. She was of "three-island" construction with a forecastle, bridge house, and quarterdeck, extending to the full width of a low-freeboard hull. Her distinctive feature was a long "trunk" along the centerline, with a breadth of about half the vessel's beam, which connecting the three elements of the superstructure. This trunk was stepped inward from the sides of the hull. That trunk was not a deckhouse or superstructure, but was part of the hull, and contained cargo space.
In hull form, trunk ships resembled turret deck vessels, differing mainly in eliminating the curves and joining the above-water horizontal part of the hull with the vertical strakes and sides of the trunk by right angles. The similarity was such that Doxford, builder and operator of the turret decks, sued Ropners for patent infringement.
Read more about this topic: Trunk Deck Ship
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