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Wikipedia:Articles for creation/2006-10-11

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Nemesis Factor by Hasbro (1999)

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austin

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Saul Tilden

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Bribery and Blackmail

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Five Finger Death Punch

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C Bar

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Declined. This suggestion doesn't sufficiently explain the importance or significance of the subject. See the speedy deletion criteria (A7) and/or guidelines on notability. Please provide more information on why the subject is worthy of inclusion in an encyclopedia. Thank you. Graeme Bartlett (talk) 15:55, 19 February 2008 (UTC)[reply]

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XS-BASS

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Timur Stroil

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Michael Carey

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(Untitled submission)

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Web Site

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Roman Signer

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Dave Charnley (England)

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List of tallest structures in Europe

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See also

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Otwock Hospital

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The Royal Victoria Patiotic Building

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Jock Mahoney

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Dave Charnley (boxer)

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Soapy The Chicken

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Transverse Flow Effect

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Transverse flow effect is an aerodynamic effect encountered when the helicopter moves (typically forward) through the air.

In a hover, the air above the rotor disk is being pulled down from above and is equally distributed around the rotor disk. The air is descending from above, which has the effect of reducing angle of attack.

As the helicopter starts moving into undisturbed air, a portion of the disk is in clean, unaccelerated air, while the remaining portion of the rotor disk is still working on descending air. The part of the disk working on clean air therefore sees a higher angle of attack than the portion of the disk which is working on descending air. This causes a difference in lift between the section in clean air and the section in descending air. The result is that the portion in clean air develops more lift, and the disk tilts as a result. Which way the disk tilts depends on a couple factors:

Gyroscopic precession will cause the extra lift to be seen approximately 90 degrees later in rotor rotation, so the pilot will experience either a right or left roll, depending upon whether the rotor of the helicopter rotates clockwise or counter-clockwise. Typically, an American helicopter would roll to the right during the takeoff roll, while a French or Russian helicopter would roll to the left.

Which way the helicopter rotor disk is moving in the wind will determine which part of the disk has higher lift. For instance, hovering sideways, or hovering stationary in a crosswind, the clean portion of the disk might be on the left or right, rather than the front of the rotor disk. Again, depending on which direction the rotor rotates, this might be seen as a nose pitch up or nose pitch down, a roll, or something in between.

As the helicopter accelerates into a higher airspeed, more and more of the rotor disk will be in clean air and the lift differential will decrease. At some higher airspeed the effect will disappear. In a typical single rotor helicopter, the effect can be felt to start at around 5-10 knots, increases in magnitude to a maximum around 20 knots, and decreases above that until it is almost completely gone by 40-60 knots of airspeed.


Sources

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http://www.copters.com

Paulcantrell 16:33, 10 October 2006 (UTC)[reply]

Maw

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Fleshy Fun Bridge

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blah blah blah

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Colin A. Stein

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Tribromophenol

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Tribromophneol (C6H2Br3OH) is used as a flame retardant in epoxy, polyurethane, plastics, paper, textiles and others. It also has antiseptic properties

Sources

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http://www.chemicalland21.com/specialtychem/perchem/2,4,6-TRIBROMOPHENOL.htm 86.142.5.55 20:01, 10 October 2006 (UTC)[reply]

Allan E. Cassis

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The Voyd

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The Katy James and Becky Oblein movement

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A.J. Shupack - A.K.A." The Shoe "

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The Magic House

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Pierce Lilholt resides at Franklin College

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Sudio Sudarsan

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the beast

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FDP

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Paint Branch High School

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THE ABERECHEYA’S ORIGIN HISTORY AND GROWTH

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List of MyFox Affiliate Websites

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The Garden of Cosmic Speculation

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