Yoke (aeronautics)

A yoke, alternatively known as a control column is a device used for piloting some fixed-wing aircraft.

The pilot uses the yoke to control the attitude of the plane, usually in both pitch and roll. Rotating the control wheel controls the ailerons and the roll axis. Fore and aft movement of the control column controls the elevator and the pitch axis. When the yoke is pulled back the nose of the aircraft rises. When the yoke is pushed forward the nose is lowered. When the yoke is turned left the plane rolls to the left and when it is turned to the right the plane rolls to the right.

Small to medium-size aircraft, usually limited to propeller driven, feature a mechanical system whereby the yoke is connected directly to the control surfaces with cables and rods. Human muscle power alone is not enough for larger and more powerful aircraft, so hydraulic systems are used, in which yoke movements control hydraulic valves and actuators. In more modern aircraft, inputs may first be sent to a fly-by-wire system, which then sends a corresponding signal to actuators attached to the control surfaces. Yokes may feature a stick shaker, which is designed to help indicate the onset of stall, or even a stick pusher, which assists in stall recovery.

Yoke

A yoke is a wooden beam normally used between a pair of oxen or other animals to enable them to pull together on a load when working in pairs, as oxen usually do; some yokes are fitted to individual animals. There are several types of yoke, used in different cultures, and for different types of oxen. A pair of oxen may be called a yoke of oxen, and yoke is also a verb, as in "to yoke a pair of oxen". Other animals that may be yoked include horses, mules, donkeys, and water buffalo.

Etymology

The word "yoke" is believed to derive from Proto-Indo-European *yugóm (yoke), from verb *yeug- (join, unite). This root has descendants in almost all known Indo-European languages including German Joch, Latin iugum, Ancient Greek ζυγόν (zygon), Persian یوغ (yuğ), Sanskrit युग (yugá), Hittite 𒄿𒌑𒃷 (iúkan), Old Church Slavonic иго (igo), Lithuanian jungas, Old Irish cuing, Armenian լուծ (luç), etc. (all meaning "yoke"). The verb to subjugate derives from the Latin form.

Neck or bow yoke

A bow yoke /ˈboʊ/ is a shaped wooden crosspiece bound to the necks of a pair of oxen (or occasionally to horses). It is held on the animals' necks by an oxbow, from which it gets its name. The oxbow is usually U-shaped and also transmits force from the animals' shoulders. A swivel between the animals, beneath the centre of the yoke, attaches to the pole of a vehicle or to chains (traces) used to drag a load.

Yoke (Lake District)

Yoke is a fell in the Lake District in Cumbria, England. It has a height of 706 m (2,316 ft) and is situated in the far eastern sector of the national park, 7 kilometres north east of the town of Ambleside. Yoke is the southern extremity of the long ridge that runs southwards from the fell of High Street. Yoke’s name is believed to be derived from the Old English language word geoc which is similar to the German word joch meaning mountain ridge.

Ascents

Yoke is not known to Lake District writers as one of the most attractive fells but it is climbed frequently as part of the Kentmere Horseshoe, a 19 kilometre walk with 1,100 metres of ascent that starts and finishes in the village of Kentmere and takes in the other fells of Kentmere Pike, Harter Fell, Mardale Ill Bell, Thornthwaite Crag, Froswick and Ill Bell. Most common direct ascents go via the summit of the Garburn Pass (Byway open to all traffic), which can be reached either from Kentmere or Troutbeck. At the top of the pass the walker turns northwards following a wall over initial boggy ground to reach the summit of the fell. Some repair work has been done on these southern slopes of Yoke to address the problem of footpath erosion

Yoke (disambiguation)

A yoke is a device borne across the shoulders of animals or humans, for example to harness draught animals together, or to assist humans (see carrying pole) in transporting heavy or awkward burdens.

Yoke may also refer to:

See also