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

Revision as of 21:23, 17 January 2007

A Wham-O Professional Frisbee

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.

History

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 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, 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

Template:Main

Ultimate
Freestyle frisbee
Disc Golf - the traditional game of Golf played with flying discs (frisbees) instead of clubs and balls.
Durango Boot
Double Disc Court
Guts Frisbee
Flutterguts
Friskee
Disc dog
Dodge Frisbee
Goaltimate
Schtick
Fricket, (sometimes called Cups, Suzy Sticks, Frisnok or Disc Cricket)
Hot Box
Fris-Nok, the traditional Icelandic-Canadian game.
Flyer Frizbee

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

In the animated motion picture The Secret of NIMH, based on the book Mrs. Frisby and the Rats of NIMH, the main character's name was changed in post-production from "Frisby" to "Brisby" to avoid potential trademark infringements.
In the film Back to the Future Part III, Marty McFly throws a metal pie dish at a gunman in order to save Doc Brown's life. He notices the dish is stamped "Frisbie Pie Company", giving a fictional origin to the current use of the term.
Richard Feynman in his book Surely You're Joking, Mr. Feynman! suggests that watching the wobble of a plate tossed in the Cornell University cafeteria stimulated him to develop mathematics that eventually led to his Nobel prize winning work in quantum electrodynamics [1].

External links

Ultimate Players Association sports governing body of Ultimate in the USA
Freestyle Players Association sports governing body of Freestyle Frisbee in the world
World Flying Disc Federation international sports governing body for all
Wham-O Frisbee disc website manufacturer of Frisbee brand flying discs
UK Ultimate Association

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

@@ Line 11: / Line 11: @@
 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.
+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==
@@ Line 38: / Line 38: @@
 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. When there is a deformation in the disc, the disc can fly off and hit someone in the head and knock them out for drama. This can cause severe injury and happiness.
+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==