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A double acting engine is an engine where steam is applied to both sides of the piston. Earlier steam engines applied steam in only one direction, allowing momentum or gravity to return the piston to its starting place, but a double acting engine uses steam to force the piston in both directions, thus increasing rotational speed and power. [50]
Nimrod was a wooden-hulled, three-masted sailing ship with auxiliary steam engine that was built in Scotland in 1867 as a whaler.She was the ship with which Ernest Shackleton made his Nimrod Expedition to Antarctica in 1908–09.
Screw-driven steamships generally carry the ship prefix "SS" before their names, meaning 'Steam Ship' (or 'Screw Steamer' i.e. 'screw-driven steamship', or 'Screw Schooner' during the 1870s and 1880s, when sail was also carried), paddle steamers usually carry the prefix "PS" and steamships powered by steam turbine may be prefixed "TS" (turbine ship).
Steam powers two types of engine, reciprocating (with steam driving pistons connected to a crankshaft) and turbine (with steam driving blades attached radially to a spinning shaft). The shaft power from each can either go directly to the propeller, pump jet or other mechanism, or it goes through some form of transmission; mechanical, electrical ...
Waverley is powered by a three-crank diagonal triple-expansion marine steam engine built by Rankin & Blackmore, Engineers, Eagle Foundry, Greenock, Scotland. [19] It is rated at 2,100 IHP and achieved a trial speed of 18.37 knots (34.02 km/h; 21.14 mph) at 57.8 rpm. Passengers can watch this engine from passageways on either side of the engine ...
The following morning the ship got steam up for the first time at 11 a.m., but the engine was in use only half an hour before rough weather persuaded the captain to stow the paddlewheels and revert to sail power once again. The ship reached her destination April 6, having employed the engines for a total of 41½ hours during the 207-hour voyage.
This left no significant routes in which sail clearly outcompeted steam. [2]: 106–111 [3]: 89 [4]: 124 Triple expansion steam engines would continue to power major vessels throughout the world for the next seventy years. [5] [a] An unusual feature of Aberdeen's boilers was the adjustable length of the grates.
The compound engine, where steam was expanded twice in two separate cylinders, still had inefficiencies. The solution was the triple expansion engine, in which steam was successively expanded in a high pressure, intermediate pressure and a low pressure cylinder. [27]: 89 [28]: 106-111