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All propellers produce a transverse thrust, also called screwing effect or starting bias, which gives a tendency for end of ship to move sideways. In a twin-screw ships the port propeller is usually left-handed and the starboard right-handed, to cancel out the transverse thrust and avoid propeller walk. [2]
A screw steamer or screw steamship (abbreviated "SS") is an old term for a steamship or steamboat powered by a steam engine, using one or more propellers (also known as screws) to propel it through the water. Such a ship was also known as an "iron screw steam ship".
Steam-powered ships were named with a prefix designating their propeller configuration i.e. single, twin, triple-screw. Single-screw Steamship SS, Twin-Screw Steamship TSS, Triple-Screw Steamship TrSS. Steam turbine-driven ships had the prefix TS. In the UK the prefix RMS for Royal Mail Steamship overruled the screw configuration prefix. [11]
The picket boat of the Royal Navy, (also sometimes called a P1000) was a twin screw boat in use at Britannia Royal Naval College in Dartmouth primarily to train officer cadets in boat handling and seamanship.
Walking the boat was a way of lifting the bow of a steamboat like on crutches, getting up and down a sandbank with poles, blocks, and strong rigging, and using paddlewheels to lift and move the ship through successive steps, on the helm. Moving of a boat from a sandbar by its own action was known as "walking the boat" and "grass-hoppering".
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TSS Earnslaw is a 1912 Edwardian twin screw steamer based at Lake Wakatipu in New Zealand. She is one of the oldest tourist attractions in Central Otago , and the only remaining commercial passenger-carrying coal-fired steamship in the southern hemisphere.
The Yorktown-class ships were powered by two triple-expansion steam engines which each drove one of the pair of 10.5-foot (3.2 m), three-bladed screw propellers. The cylinders of each engine were 22, 31, and 51 inches (56, 79, and 130 cm) in diameter and had a 30-inch (76 cm) stroke . [ 2 ]