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The polyspastos, when worked by four men at both sides of the winch, could readily lift 3,000 kg (6,600 lb) (3 ropes x 5 pulleys x 4 men x 50 kg or 110 lb = 3,000 kg or 6,600 lb). If the winch was replaced by a treadwheel, the maximum load could be doubled to 6,000 kg (13,000 lb) at only half the crew, since the treadwheel possesses a much ...
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The Roman Polyspaston crane, from Ancient Greek πολύσπαστον (polúspaston, “compound pulley”), when worked by four men at both sides of the winch, could lift 3000 kg. In case the winch was replaced by a treadwheel, the maximum load even doubled to 6000 kg at only half the crew, since the treadwheel possesses a much bigger ...
The winch is either controlled with a detachable cable, a button inside the car or wireless remote. Older vehicles may have a PTO winch, controlled via the car's transmission, a secondary clutch maybe used so the vehicle does not need to be moving while winching. Some winches are powered by the pressure generated in the hydraulic steering system.
The aircraft is designed to carry as much as 20,000 lb (9,100 kg) for a 3,200-nautical-mile (5,900 km) range carrying beneath its 1,315 square feet (122.2 m 2) of high-mounted wings. American Utilicraft, the predecessor of Utilicraft Aerospace Industries, patented the design for the FF-1080 in 1991.
The SS Schenectady split apart by brittle fracture while in harbor, 1943. It was a 152-meter-long T2 tanker. Early Liberty ships suffered hull and deck cracks, and a few were lost due to such structural defects. During World War II there were nearly 1,500 instances of significant brittle fractures.
Information on aircraft gives the type, and if available, the serial number of the operator in italics, the construction number (c/n), also known as the manufacturer's serial number, exterior codes in apostrophes, nicknames (if any) in quotation marks, flight call sign in italics, and operating units.
A remarkable example of their shipbuilding skills was the Khufu ship, a vessel 143 feet (44 m) in length entombed at the foot of the Great Pyramid of Giza around 2500 BC and found intact in 1954. The oldest discovered sea faring hulled boat is the Late Bronze Age Uluburun shipwreck off the coast of Turkey, dating back to 1300 BC.
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