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Richard F. Smith, the designer, devised the lock notch welded system for which Charleston Dry Dock & Machine was the sole licensee. [6] The design consisted of steel plates with notches that allowed easy fit-up and welding. Only nine workmen were required to assemble the hull. This design saved one-quarter of the cost, and 85,000-lbs of rivets.
During World War Two, high-strength alloyed steel was introduced, allowing for depths up to 200 metres (660 ft); post-war calculations have suggested crush depths exceeding 300 metres (980 ft) for late-war German Type VII U-boats. High-strength alloyed steel is still the main material for submarines today, with 250 to 350 metres (820 to 1,150 ...
[2] [3] It is a part of the marine construction industry. [4] Underwater welding may be used, and for repair work cutting of steel or concrete may be necessary. Marine salvage is the process of recovering a ship and its cargo after a shipwreck or maritime accident. Salvage may encompass towing, re-floating a vessel, or effecting repairs to a ship.
In steel shipbuilding, the entire frame can be formed in one piece by rivetting or welding sections; in this case the floor remains a separate piece, joining the frame on each side to the keel. Frame numbers are the numerical values given to the frames.
It was typically applied as a casting in situ in a layer about two inches (51 mm) thick on to existing ship structures made from one-quarter-inch-thick (6.4 mm) mild steel or formed in equally thick sections on a one-half-inch-thick (13 mm) steel plate for mounting as gun shields and the like.
Like the "A" and "B" class tenders in the 180 feet (55 m) class, she was constructed of welded steel with a notched forefoot, ice-belt at the waterline, a reinforced bow for icebreaking capabilities. The superstructure was extended to the ship's sides for increased interior volume above the main deck.
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Small outboard motors, up to 15 horsepower (11 kW) or so, are easily portable. They are affixed to the boat via clamps and thus easily moved from boat to boat. These motors typically use a manual start system, with throttle and gearshift controls mounted on the body of the motor, and a tiller for steering. The smallest of these weigh as little ...