The designer boasted that it could cross the English Channel and back in a day, and sink a hundred ships along the way.
This almost submarine – a semi-submerged ram – was supposed to sneak up unobserved and punch a hole in an enemy ship. 1654 The 72-foot-long "Rotterdam Boat," designed by a Frenchman (named DE SON) was probably the first underwater vessel specifically built (by the council of the Southern Netherlands) to attack an enemy (the English Navy).
Reports that James I took an underwater ride are most unlikely. Reports that Drebbel's patron, James I, witnessed a demonstration, may be true. When the rowers stopped rowing, the boat would slowly rise. The boat would be driven under the surface by forward momentum.
Best guess: the boat was designed to have almost-neutral buoyancy, floating just awash, with a downward-sloping foredeck to act as a sort of diving plane. There are no credible illustrations of Drebbel's boat, and no credible explanations of how it worked. According to accounts, some of which may have been written by people who actually saw the submarine, it was a decked-over rowboat, propelled by twelve oarsmen, which made a submerged journey down the Thames River at a depth of about fifteen feet. " 1623 Dutchman CORNELIUS DREBBEL, hired in 1603 as "court inventor" for James I of England, built what seems to have been the first working submarine. having alwaies but one weight, may be made bigger or lesser, then it Shall swimme when you would, and sinke when you list. Any magnitude of body that is in the water. Bourne first offered a lucid description of why a ship floats – by displacing its weight of water - and then described a mechanism by which: "It is possible to make a Ship or Boate that may goe under the water unto the bottome, and so to come up again at your pleasure. Transcript: A history of submarines 1580 The first published prescription for a submarine came from the pen of WILLIAM BOURNE, an English innkeeper and scientific dilettante.
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