flush deck
{{Short description|Term in naval architecture}}
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In naval architecture, a flush deck is a ship deck that is continuous from stem to stern.{{citation needed|date=October 2014}}
History
Flush decks have been in use since the times of the ancient Egyptians. Greco-Roman Trireme often had a flush deck but may have also had a fore and aft castle deck. Flush decks were also common on medieval and Renaissance galleys but some also featured fore and aft castle decks. The medieval Brigantine and later Brig and Snow ships also featured flush decks.
File:The trireme Olympias on 23 February 2019.jpg with a flush deck]]
Two different meanings of "flush"
{{Unreferenced section|date=October 2014}}
"Flush deck" with "flush" in its generic meaning of "even or level; forming an unbroken plane", is sometimes applied to vessels, as in describing yachts lacking a raised pilothouse for instance. "Flush deck aircraft carrier" uses "flush deck" in this generic sense.
"Flush deck" in its more specific maritime-architecture sense denotes (for instance) the flush deck destroyers described above: the flush decks are broken by masts, guns, funnels, and other structures and impediments, and are far from being unbroken planes. "Flush deck" in this sense only signifies that the main deck runs the length of the ship and does not end before the stem (with a separate raised forecastle deck forward) or before the stern (with a separate raised or, as seen on many modern warships, lowered quarterdeck rearward).
{{Gallery
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||{{USS|Allen|DD-66|6}} is not a flush-deck vessel: note the raised forecastle deck forward, running about one-quarter the length of the ship
|File:USS Sigourney (DD-81) at the Boston Naval Shipyard, Massachusetts (USA), on 9 February 1919 (NH 41809).jpg|In contrast, the flush-deck {{USS|Sigourney|DD-81|6}} (later HMS Newport) has no forecastle
|File:USS Belknap official photo.jpg| {{USS|Belknap|CG-26|6}}, a later example of a non-flush-deck ship, with the main deck giving way to a lower quarterdeck towards the stern
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Types
Flush deck aircraft carriers are those with no island superstructure, so that the top deck of the vessel consists of only an unbroken flight deck.{{cite web | url=https://warshipprojects.com/2020/02/18/warship-projects-profile-jp201-amagi-class-carrier-conversions/ | title=Warship Projects Profile No.JP201 – Amagi class carrier conversions | date=18 February 2020 }}
"Flush deckers" is a common nickname for a series of American destroyers built in large quantities during or shortly after World War I – the {{Sclass|Caldwell|destroyer|5}}, {{Sclass|Wickes|destroyer|5}}, and {{Sclass|Clemson|destroyer|5}} classes – so called because they lacked the raised forecastle of preceding American destroyers, thus the main deck was a flush deck.{{cite web |url=http://destroyerhistory.org/flushdeck/ |title=Flush Deckers |work=Destroyer History Foundation |access-date=October 20, 2014}}