Washout

From Wikipedia, the free encyclopedia

You have new messages (last change).

The term washout can have various meanings:

Contents

[edit] Aviation

In aviation, washout refers to the practice of building a wing with a slight twist, reducing the angle of incidence from root to tip. This is usually to ensure that, at the stall, the wing root stalls before the wing tips. However, washout may also be used to modify the spanwise lift distribution to reduce lift-induced drag.

Wingtip stall is unlikely to occur symmetrically, especially if the aircraft is maneuvering. As an aircraft turns, the wingtip on the inside of the turn is moving more slowly and is most likely to stall. As an aircraft rolls, the down-going wing tip is at higher incidence and is most likely to stall. When one wingtip stalls it leads to wing drop, a rapid rolling motion. Also, roll control may be reduced if the airflow over the ailerons is disrupted by the stall reducing their effectiveness. Thus, a pilot may be unable to maintain control, perhaps leading to an unrecoverable spin.

On aircraft with swept wings, wingtip stall also produces an undesirable nose up pitching moment which hampers recovery from the stall.

Washout may be accompanied by other means e.g. modified aerofoil section, vortex generators, leading edge wing fences or notches and stall breakers, to reduce the probability of wingtip stall.

[edit] External links

[edit] Well drilling

A washout is generally any enlargment or hole formed in an oil well after the hole has been drilled.[1][2]

[edit] Military

In the United States Military, "washing out" is slang for failing a training program.

[edit] Sudden erosion affecting road and rail transport

In road and rail transport, a washout is the result of a natural disaster where the roadbed is eroded away by flowing water, usually as the result of a flood. When a washout destroys a railroad's right-of-way, the track is sometimes left suspended in midair across the newly formed gap, or it dips down into a ditch. the phenomenon is discussed in more detail under erosion.

[edit] Jamaican culture

In the Jamaican culture "washout" refers to a popular way of cleaning out one's system. It is a laxative purge that supposedly eliminates blockages and harmful waste from the system. For females, they are recommended that this is done monthly; it is scheduled around their menstrual cycle. Often the only medicinal essentials that a rural Jamaican home contains is some sort of purgative, such as: Epsom salts, cathartic herbs, or castor oil. These people also view life-supporting devices in hospitals (such as the nasogastric tube) to be mechanical washout cures. In this culture, the belief is that if you do not cleanse your insides then you will rot, leads them to these actions. For more information, see Jamaican People and Washout.

[edit] References

  1. ^ ODP Leg 186: Western Pacific Geophysical Network Logging Summary. Retrieved on 2006-08-17.
  2. ^ Downhole Logging While Drilling. Retrieved on 2006-08-17.
This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.
Retrieved from "http://en.wikipedia.org../../../w/a/s/Washout.html"