Difference between revisions of "AY Honors/Ultimate Disc/Answer Key"

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==Physics==
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{{main|Physics of flying discs}}
 
  
[[Lift (force)|Lift]] is generated in primarily the same way as a traditional asymmetric [[airfoil]], that is, by accelerating upper airflow such that a pressure difference gives rise to a lifting force. Small ridges near the leading edge act as turbulators, reducing flow separation by forcing the airflow to become [[turbulent]] after it passes over the ridges. 
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The rotating flying disc has a vertical [[angular momentum]] vector, stabilizing its attitude <!-- "attitude" is the correct term here; pls don't change to "altitude". -elf Dec 05 --> [[gyroscope|gyroscopically]]. Depending on the cross-sectional shape of the airfoil, the amount of lift generated by the front and back parts of the disc may be unequal. If the disc was not spinning, this would tend to make it [[Flight dynamics|pitch]]. When the disc is spinning, however, such a torque would cause it to [[precession|precess]] about the roll axis, causing its trajectory to curve to the left or the right. Most discs are designed to be aerodynamically stable, so that this roll is self-correcting for a fairly broad range of velocities and rates of spin. However, many [[disc golf]] discs are intentionally designed to be unstable. Higher rates of spin lead to better stability, and for a given rate of spin, there is generally a range of velocities that are stable.
 
 
 
Even a slight deformation in a disc, called a "Taco," as extreme cases look like a [[taco shell]], can cause adverse affects when throwing long range. It can be observed by holding the disc horizontally at eye level and looking at the rim while slowly rotating the disc.
 
  
 
==Training==
 
==Training==

Revision as of 17:33, 11 September 2007

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Flying discs (commonly called Frisbees) are disc-shaped objects, which are generally plastic and roughly 20 to 25 centimeters (8–10 inches) in diameter, with a lip. The shape of the disc, an airfoil in cross-section, allows it to fly by generating lift as it moves through the air while rotating. The name Frisbee is a registered trademark of the Wham-O toy company, but is often used generically to describe all flying discs.

Flying discs are thrown and caught for recreation, and as part of many different flying disc games. A wide range of flying disc variants are available commercially. Disc golf discs are usually smaller but denser and are tailored for particular flight profiles to increase/decrease stability and distance. Disc dog sports use relatively slow flying discs made of more pliable material to better resist a dog's bite and prevent injury. Ring shaped discs are also available which typically fly significantly farther than any traditional flying disc. There are illuminated discs meant for night time play which use phosphorescent plastic, or battery powered light emitting diodes. There are also discs that whistle when they reach a certain velocity in flight.

I HATE NIGGERS

KNEEGROW

GIGGITY GIGGITY GIGGITY

LET'S HAVE SEX

Training

NIGGERS CAN'T THROW FRISBEES

Trivia

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See also

Further reading

  • Flat Flip Flies Straight! True Origins of the Frisbee® Walter Frederick Morrison and Phil Kennedy, Wormhole Publishers, Wethersfield, CT (June 2006), ISBN 978-0-9774517-4-6
  • Frisbee, A Practitioner's Manual and Definitive Treatise Stancil E.D. Johnson, M.D. Workman Publishing Company, New York (July, 1975) ISBN 978-0-911104-53-0
  • The Official Frisbee Handbook Goldy Norton, Bantam Books, Toronto/New York/London (July, 1972) no ISBN
  • Frisbee Players' Handbook Mark Danna, Dan Poynter, Parachuting Publications, Santa Barbara, California (1978) ISBN 0915516195
  • Frisbee Sports & Games Charles Tips, Dan Roddick, Celestial Arts, Millbrae, California (March 1979) ISBN 978-0-89087-233-8
  • Frisbee by the Masters Charles Tips, Celestial Arts, Millbrae, California (March 1977) ISBN 978-0-89087-142-3
  • Spinning Flight : Dynamic of Frisbee, Boomerang, Samara and Skipping Stone, Ralph Lorenz, Copernicus New York, September 2006 ISBN 978-0-387-30779-4

External links

Notes


cs:Frisbee da:Frisbee de:Frisbee es:Frisbee eo:Flugdisko fr:Frisbee he:פריזבי it:Frisbee nl:Frisbee ja:フライングディスク no:Frisbee pl:Frisbee ru:Летающий диск sk:Frisbee sr:Frizbi sv:Frisbee uk:Фрісбі zh:飛盤