Kitchen rudder

The Kitchen Rudder is the familiar name for "Kitchen's Patent Reversing Rudders", a combination rudder and directional propulsion delivery system for relatively slow speed displacement boats which was invented in the early 20th century by Admiral Jack Kitchen of the British Royal Navy. It turns the rudder into a directional thruster, and allows the engine to maintain constant revolutions and direction of drive shaft rotation while altering thrust by use of a control which directs thrust forward or aft. Only the rudder pivots; the propeller itself is on a fixed shaft and does not.

"Kitchener gear" or "Kitchener rudder" have been common misnomers for the Kitchen rudder.

It is held under British Patent 3249/1914 and US Patent 1186210 (1916) and has been improved with the design in US Patent 4895093 (1990)

Description

The rudder consists of a pair of slightly conical (usually but not always - designs vary), semi-cones mounted on a pivot either side of the propeller with the long axis of the cone running fore and aft when the helm is midships. They are pivoted about a vertical axis such that the cone may close off the propeller thrust aft of the propeller, directing the thrust forwards and thus creating motion astern.

In addition to the "jaws" of the cone being controlled the direction of thrust is also controlled by rudder direction (compare this with an outdrive or an outboard motor for direction of thrust of an unenclosed propeller where the propeller itself pivots).

Modern equivalent include certain types of pump jets or the jet drive.

While not strictly Kitchen rudder technology, the "clamshell" thrust reverser on some aircraft jet engines is an aeronautical derivative of the device. The picture of the aircraft shows the clamshells deployed directing thrust forwards. This is equivalent to the Kitchen rudder in the "full astern" position.

Operation

The operation of the Kitchen Rudder is performed with the propellor engaged, even when the boat is stationary. [cite web |url=http://www.proboat-digital.com/proboat/200608/?pg=63 |title=Rudders, Medium to Rare |publisher=Professional Boatbuilder |accessdate=2007-10-12 |month=August |year=2006 |last=Dave |first=Gerr] The rudder is controlled by a small wheel on the tiller.cite web |url=http://www.defence.gov.au/news/navynews/editions/4916/pdf/RN8.pdf |format=pdf |title=New lease of life for 65-year-old navy cutter
last=Dunning |first=Steve |accessdate=2007-10-12 |publisher=Reserve News (Royal Australian Navy) |date=2006-09-07 |quote=A small wheel attached to the tiller is used to control two curved metal plates that surround the propeller enabling the boat to go ahead, go astern or remain stationary without any change of engine speed or reversing of the propeller.
]

Neutral

The engine is brought up to speed with the drive to the propeller engaged and with the Kitchen rudder in the "neutral" position. This is a position where an equal quantity of thrust is aimed forward and aft. Each vessel will have a unique "neutral" position.

Moving ahead

The Kitchen gear is opened up to direct an increasing proportion of thrust aft. As the balance changes the vessel will move ahead.

Moving astern

The Kitchen gear is closed to direct an increasing proportion of thrust forward. As the balance changes the vessel will move astern.

ee also

*Azipod
*Kort nozzle
*Pleuger rudder
*Reverse thrust
*Rudder
*Sterndrive

Notes

External links

* [http://www.hmsconway.org/relics_artifacts.html Description near the foot of the article under Pinnace]
* [http://www.pcez.com/~artemis/SLAkitchen.gifKitchen Rudder - Diagrams]
* [http://www.boatdesign.net/forums/showthread.php?t=418&highlight=Kitchen+rudder Kitchen Rudder - Discussion and diagrams]
* [http://patimg2.uspto.gov/.piw?Docid=04895093&idkey=NONE Manoeuvring device for boats: United States Patent 4895093] , expiring in fall 2007
* [http://www.boatdesign.net/forums/attachment.php?attachmentid=279&d=1031890494 Special rudders and manoeuvering devices]


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Kitchen rudder — …   Useful english dictionary

  • Rudder — A rudder is a device used to steer a ship, boat, submarine, hovercraft, or other conveyance that move through a fluid (generally air or water). On an aircraft the rudder is used primarily to counter adverse yaw and p factor and is not the primary …   Wikipedia

  • Pleuger rudder — The Pleuger rudder is a power assisted ship s rudder. It creates a flow of water in the direction the rudder points powered by an auxiliary electric motor. This aids manoeuvrability at low speeds greatly, since it operates on a similar principle… …   Wikipedia

  • Glossary of nautical terms — This is a glossary of nautical terms; some remain current, many date from the 17th 19th century. See also Wiktionary s nautical terms, Category:Nautical terms, and Nautical metaphors in English. Contents: A B C D E F G H I J K L M N O P Q R …   Wikipedia

  • Kort nozzle — The Kort nozzle is a shrouded, ducted propeller assembly for marine propulsion. The hydrodynamic design of the shroud, which is shaped like a foil, offers advantages for certain conditions over bare propellers.Kort nozzles or ducted propellers… …   Wikipedia

  • Sterndrive — The outdrive unit of a boat with sterndrive A sterndrive or inboard/outboard drive (I/O) is a form of marine propulsion. The engine is located inboard just forward of the transom (stern) and provides power to the drive unit (outdrive) located… …   Wikipedia

  • Propeller — A propeller is essentially a type of fan which transmits power by converting rotational motion into thrust for propulsion of a vehicle such as an aircraft, ship, or submarine through a mass such as water or air, by rotating two or more twisted… …   Wikipedia

  • Pump-jet — A pump jet or water jet is a marine system that creates a jet of water for propulsion. The mechanical arrangement may be a ducted propeller with nozzle, or a centrifugal pump and nozzle. The first functioning pump jet engine was created by New… …   Wikipedia

  • Self-steering gear — is equipment used on ships and boats to maintain a chosen course without constant human action. It is also known by several other terms, such as autopilot (borrowed from aircraft and considered incorrect by some) and autohelm (technically a… …   Wikipedia

  • Woodway House — is in Teignmouth, South Devon, England. It was at one time a farm on lands held by the Bishops of Exeter. In around 1815 a thatched cottage in the cottage orne style of Horace Walpole s (1717 1797) Thames side villaEvans, Tony Green, Candida… …   Wikipedia


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.