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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]
Or it may couple various parts together so that they move in unison – the primary example of this being a flexible drive to mate two shafts in order to transmit torque. Some devices use dog clutches to lock together two spinning components. In a manual transmission, the dog clutches, or "dogs" lock the selected gear to the shaft it rotates on ...
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".
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.
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]
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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Dog clutch used to drive the rotating platter in a microwave oven. Dog clutch (disengaged) on the countershaft gears of the Honda CBR600RR transmission.. A dog clutch (also known as a dog box, dog gears, dog ring, clutch dog, or positive clutch) is a type of clutch that couples two rotating shafts or other rotating components by engagement of interlocking teeth or dogs rather than by friction.