A steering engine is a
power steering
A power steering is a mechanical device equipped on a motor vehicle that helps drivers steer the vehicle by reducing steering effort needed to turn the steering wheel, making it easier for the vehicle to turn or maneuver at lower speeds.
Hydraul ...
device for ships.
History
The first steering engine with feedback was installed on
Isambard Kingdom Brunel
Isambard Kingdom Brunel (; 9 April 1806 – 15 September 1859) was a British civil engineer who is considered "one of the most ingenious and prolific figures in engineering history," "one of the 19th-century engineering giants," and "one ...
's
''Great Eastern'' in 1866.
Designed by Scottish engineer
John McFarlane Gray
John McFarlane Gray (7 April 1831 – 14 January 1908), also known as J. Macfarlane Gray, was a Scottish engineer who invented a portable steam riveting machine and a steam steering mechanism for Isambard Kingdom Brunel's famous ''SS Great Easte ...
and built by
George Forrester and Company
George Forrester and Company was a British marine engine and locomotive manufacturer at Vauxhall Foundry in Liverpool, established by Scottish engineer George Forrester (b. 1780/81). The company opened in 1827 as iron founders and commenced buil ...
, this was a steam-powered mechanical amplifier used to drive the
rudder
A rudder is a primary control surface used to steer a ship, boat, submarine, hovercraft, aircraft, or other vehicle that moves through a fluid medium (generally aircraft, air or watercraft, water). On an aircraft the rudder is used primarily to ...
position to match the
wheel
A wheel is a circular component that is intended to rotate on an axle Bearing (mechanical), bearing. The wheel is one of the key components of the wheel and axle which is one of the Simple machine, six simple machines. Wheels, in conjunction wi ...
position. The size of ''Great Eastern,'' by far the largest ship of her day, made power steering a necessity.
Large steam-powered warships with manual steering needed huge crews to turn the rudder rapidly. The Royal Navy once used 78 men hauling on
block and tackle
A block and tackle or only tackle is a system of two or more pulleys with a rope or cable threaded between them, usually used to lift heavy loads.
The pulleys are assembled to form blocks and then blocks are paired so that one is fixed and on ...
gear to manually turn the rudder on
HMS ''Minotaur'', in a test of manual vs. steam powered steering.
Steam-powered steering engines were employed on large steamships thereafter.
The Mississippi River style steamboat ''
Belle of Louisville
''Belle of Louisville'' is a steamboat owned and operated by the city of Louisville, Kentucky, and moored at its downtown wharf next to the Riverfront Plaza/Belvedere during its annual operational period. The steamboat claims itself the "most wi ...
'', (originally ''Idlewild'' and oldest in her class), is fitted with a steering engine. Original equipment when the boat was launched at Pittsburgh in 1915, the engine consists of a single double-acting steam cylinder mounted aft of and above the engines, coupled to the rudders, with the motion of travel abeam. The steam valves of the engine are controlled by mechanical linkages which extend up to levers mounted either side of the engine order telegraph, just aft of the pilot wheel in the pilot house above. The steering engine is open to public view. A functional description is given in the 1965 book ''Str. Belle of Louisville,'' by Alan L. Bates, the marine architect who supervised the restoration of the boat, who comments that when in use, the steering engine causes the pilot wheel to whirl "as fast as an electric fan." The same source also describes the functional need for steering hard-to in vessels of its type, whose combination of shallow draft and high above-water profile require rapid changes in rudder under shifting wind conditions, a need which is addressed by the steering engine.
See also
*
Power steering
A power steering is a mechanical device equipped on a motor vehicle that helps drivers steer the vehicle by reducing steering effort needed to turn the steering wheel, making it easier for the vehicle to turn or maneuver at lower speeds.
Hydraul ...
*
Servomechanism
In control engineering a servomechanism, usually shortened to servo, is an automatic device that uses error-sensing negative feedback to correct the action of a mechanism. On displacement-controlled applications, it usually includes a built-in ...
*
Ship's wheel
A ship's wheel or boat's wheel is a device used aboard a water vessel to steer that vessel and control its course. Together with the rest of the steering mechanism, it forms part of the helm. It is connected to a mechanical, electric servo, or h ...
References
{{reflist
Control devices
Mechanical amplifiers
Watercraft components