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

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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, known as [[Aerobie]]s, typically fly significantly farther than any traditional flying disc.  There are illuminated discs meant for night time play which use [[Phosphorescence|phosphorescent]] plastic, or  battery powered [[light-emitting diode|light emitting diodes]].
 
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, known as [[Aerobie]]s, typically fly significantly farther than any traditional flying disc.  There are illuminated discs meant for night time play which use [[Phosphorescence|phosphorescent]] plastic, or  battery powered [[light-emitting diode|light emitting diodes]].
  
==History==
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People have been throwing cake pans, pie tins, cookie jar lids, and other such objects for centuries. The earliest known disc object to be thrown around was the [[chakram]], which was used as a weapon in [[History of India|ancient India]]. In later times, flying discs were used for recreational purposes. The [[clay target]] used in [[trapshooting]], almost identical to a flying disc in shape, was designed in the 19th century. The modern day era of flying discs began with the concept of designing and selling a commercially-produced flying disc.
 
 
 
In 2006, [[Walter Frederick Morrison|Fred Morrison]] co-authored ''Flat Flip Flies Straight!'' with flying disc historian and collector Phil Kennedy. In the book Fred reveals that it was a popcorn can lid that he tossed with his girlfriend (and later wife) Lu at a 1937 Thanksgiving Day gathering in Los Angeles, CA that inspired his interest in developing a commercially-produced flying disc. In 1946 he sketched out plans for a disc he called the "Whirlo-Way," which in 1948, co-developed and financed by [[Warren Franscioni]], became the very first plastic flying disc—the original PIPCO FLYIN-SAUCER. However, that disc was largely unsuccessful. In 1955 Fred, with help from Lu, designed and molded a brand new disc— the PLUTO PLATTER — which he then sold to Wham-O on January 23, 1957. In 1958 Wham-O renamed it the "FRISBEE," possibly a [[misspelling]] of the name of the [[Frisbie Pie Company]] of [[Bridgeport, Connecticut]], and then trademarked the name Frisbee.
 
  
 
==Games using flying discs==
 
==Games using flying discs==

Revision as of 00:00, 21 January 2007

A Wham-O Professional Frisbee

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Flying discs (commonly called Frisbees) are the general name for any number of discs which are generally plastic, roughly 20 to 25 centimeters (8–10 inches) in diameter, with a lip. The shape of a 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 versions of the flying disc.

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, known as Aerobies, 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.

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Games using flying discs

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Physics

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.

The rotating flying disc has a vertical angular momentum vector, stabilizing its attitude 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 pitch. When the disc is spinning, however, such a torque would cause it to 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.

Trivia

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 : Dynamics of Frisbees, Boomerangs, Samaras and Skipping Stones, Ralph Lorenz, Copernicus New York, September 2006 ISBN 978-0-387-30779-4

External links


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