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Yo-yo



 
 
The yo-yo is a toy
Toy

A toy is an object used in Play . Toys are usually associated with children and pets, but it is not unusual for adult humans and some non-Domesticationated animals to play with toys....
 consisting of two equally sized and weighted disks of plastic
Plastic

Plastic is the general common term for a wide range of synthetic or semisynthetic organic chemistry solid materials suitable for the manufacture of industrial products....
, wood
Wood

Wood is an organic material; in the strict sense wood is produced as secondary xylem in the stems of woody plants, notably trees but also shrubs, etc....
, or metal
Metal

In chemistry, a metal is a chemical element whose atoms readily lose electrons to form positive ions , and form metallic bonds between other metal atoms and ionic bonds between nonmetal atoms....
, connected with an axle
Axle

An axle is a central shaft for a rotation wheel or gear. In some cases the axle may be fixed in position with a bearing or bushing sitting inside the hole in the wheel or gear to allow the wheel or gear to rotate around the axle....
, with a string tied around it. First becoming popular in the 1920s, yo-yoing is still very enjoyed by both children and adults.

History
The Native Americans were supposedly using yo-yos about 1000 B.C.






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Encyclopedia


Yo Yo
The yo-yo is a toy
Toy

A toy is an object used in Play . Toys are usually associated with children and pets, but it is not unusual for adult humans and some non-Domesticationated animals to play with toys....
 consisting of two equally sized and weighted disks of plastic
Plastic

Plastic is the general common term for a wide range of synthetic or semisynthetic organic chemistry solid materials suitable for the manufacture of industrial products....
, wood
Wood

Wood is an organic material; in the strict sense wood is produced as secondary xylem in the stems of woody plants, notably trees but also shrubs, etc....
, or metal
Metal

In chemistry, a metal is a chemical element whose atoms readily lose electrons to form positive ions , and form metallic bonds between other metal atoms and ionic bonds between nonmetal atoms....
, connected with an axle
Axle

An axle is a central shaft for a rotation wheel or gear. In some cases the axle may be fixed in position with a bearing or bushing sitting inside the hole in the wheel or gear to allow the wheel or gear to rotate around the axle....
, with a string tied around it. First becoming popular in the 1920s, yo-yoing is still very enjoyed by both children and adults.

History


The Native Americans were supposedly using yo-yos about 1000 B.C. The earliest surviving yo-yo dates to 500 B.C. and is made using turlte skin disks. A Greek
Ancient Greece

The term Ancient Greece refers to the period of History of Greece lasting from the Greek Dark Ages ca. 1100 BC and the Dorian invasion, to 146 BC and the Roman Republic conquest of Greece after the Battle of Corinth ....
 vase from this period shows a boy playing yo-yo. Greek records from the period describe toys made out of wood, metal, or painted terra cotta (clay). The terra cotta disks were used to ceremonially offer the toys of youth to certain gods when a child came of age—discs of other materials were used for actual play. Philippine historical records indicate that 16th century hunters hiding in trees used a rock tied to a cord up to 20 feet in length to throw at wild animals beneath them—the cord enabling retrieval of the rock after missed attempts. Conventional wisdom surmises that this was the basis of the yo-yo, but Valerie Oliver, one yo-yo enthusiast who fails to provide any factual basis for her contention, claims that the yo-yo traveled from China to Greece and to the Philippines.

Origin of name and the Filipino/Philippine yo-yo

1791 Yo Yo Bandalore
Webster’s Collegiate Dictionary
Webster's Dictionary

Webster's Dictionary is the name given to a common type of English language dictionary in the United States. The name is derived from lexicographer Noah Webster and has become a genericized trademark for this type of dictionary....
 states that the word "yo-yo" probably derives from the northern Philippine Ilokano language
Ilokano language

Ilokano is the third most-spoken language of the Republic of the Philippines.An Austronesian languages, it is related to such languages as Indonesian language, Malay language, Fijian language, Maori language , Hawaiian language, Malagasy language , Samoan language, Tahitian language, Chamorro language , Tetum , and Paiwan language ....
 word "yóyo", while allowing that cognate
Cognate

Cognates in linguistics are words that have a common etymology origin.An example of cognates within the same language would be English shirt vs....
 words appear in other Philippine languages. Many other sources including Panati’s Extraordinary Origins of Everyday Things say that "yo-yo" was a Tagalog
Tagalog language

Tagalog is one of the major languages used in the Philippines. It is a basis for the Filipino language, which is the principal language of the national television and radio, though broadsheet newspapers are almost completely in English....
 word, supposedly meaning “come-come” or “return.”

A popular belief is that the yo-yo was a weapon for over 400 years in the Philippines. However, the idea was debunked by the former president of the Filipino American National Historical Society and by the chairman of the American Yo-Yo Association’s History and Collecting Committee. Nonetheless, the allegation was used in a Diet Mountain Dew commercial in 2008 as part of the drink's "Surprising Facts" ad campaign.

The principal distinction between the Filipino design and more primitive yoyos is in the way the yo-yo is strung. In older (and some remaining inexpensive) yoyo designs, the string is tied to the axle using a knot. With this technique, the yoyo just goes back-and-forth; it returns easily, but it is impossible to make it sleep.

In the Filipino design, one continuous piece of string, double the desired length, is twisted around itself to produce a loop at one end which is fitted around the axle. Also termed a looped slip-string, this seemingly minor modification allows for a far greater variety and sophistication of motion, thanks to increased stability and suspension of movement during free spin.

Surprisingly, this innovation in the string design is useful even for off-string yoyo play, in which the yoyo is not attached to the string at all. The looped winding ensures that the free end of the string has no bulges, splices, or other non-uniformities, which can cause the string to jam uncontrollably in off-string play.

Birth of the modern yo-yo

James L. Haven and Charles Hettrich (or Hettrick) received the first United States
United States

The United States of America is a Federal government constitutional republic comprising U.S. state and a federal district. The country is situated mostly in central North America, where its Contiguous United States and Washington, D.C., the Capital districts and territories, lie between the Pacific Ocean and Atlantic Oceans, Borders of the U...
 patent
Patent

A patent is a set of exclusive rights granted by a state to an inventor or his assignee for a term of patent in exchange for a disclosure of an invention....
 on "...an improved construction of the toy, commonly called a bandelore..." in 1866.

However, the yo-yo would remain in relative anonymity until 1928 when a Filipino American named Pedro Flores
Pedro Flores (Yo-yo manufacture)

Pedro Flores is widely considered as the first yo-yo maker in the US and with his Flores yo-yo created the start of an international craze....
 opened the Yo-yo Manufacturing Company in Santa Barbara, California
Santa Barbara, California

Santa Barbara is a city in Santa Barbara County, California, United States. Situated on an east-west trending section of coastline, the only such section on the west coast, between the steeply-rising Santa Ynez Mountains and the sea, and having a Mediterranean climate, it is called California's "South Coast", and is also sometimes referred to...
. The business started with a dozen handmade toys; by November 1929, Flores was operating two additional factories in Los Angeles
Los Angeles, California

Los Angeles is the largest city in the U.S. state of California and the List of United States cities by population in the United States. Often abbreviated as L.A. and nicknamed The City of Angels, Los Angeles is rated as a beta global city, has an estimated population of 3.8 million and spans over in Southern California....
 and Hollywood, which altogether employed 600 workers and produced 300,000 units daily. :)

The Duncan era

Shortly thereafter (ca. 1929), an entrepreneur named Donald Duncan recognized the potential of this new fad and purchased the Flores Yo-yo Corporation and all its assets, including the Flores name, which was transferred to the new company in 1932. Duncan's first yo-yo thereafter was the Duncan O-BOY. Duncan is reputed to have paid more than $250,000, a fortune by depression era
Great Depression

File:International depression.pngThe Great Depression was a worldwide economic Recession starting in most places in 1929 and ending at different times in the 1930s or early 1940s for different countries....
 standards. It turned out to be a sound investment, making many times this amount in the years to follow.

In 1946, the Duncan Toys Company
Duncan Toys Company

The Duncan Toys Company is an American toy manufacturer best known for its Yo yo. In 1968 it became a division of Flambeau, Inc.....
 opened a Yo-yo factory in Luck, Wisconsin
Luck, Wisconsin

Luck is a village in Polk County, Wisconsin, Wisconsin, United States. The population was 1,210 at the 2000 census. The village is located within the Luck , Wisconsin....
, prompting the town to dub itself 'Yo-yo Capital of the World'. Ironically, the very sign erected by the town advertising that fact contributed to Duncan losing its trademark.

1960s resurgence

Declining sales after the Second World War
World War II

World War II, or the Second World War , was a global military conflict which involved a Participants in World War II, including all of the great powers, organised into two opposing military alliances: the Allies of World War II and the Axis powers....
 prompted Duncan to launch a comeback campaign for his trademarked "Yo-Yo" in 1962 with a series of television
Television

Television is a widely used telecommunication mass-media for transmitting and receiving moving , either monochrome or color, usually accompanied by sound....
 advertisements
Advertising

Advertising is a form of communication that typically attempts to persuade potential customers to Purchasing or to consume more of a particular brand of Product or Service ....
. The media blitz was met with unprecedented success, and thanks in great part to the introduction of the Duncan Butterfly, the yo-yo was more accessible to the beginner than ever.

This success would be short-lived, however, and in a landmark trademark
TradeMark

TradeMark is a tall, primarily residential, skyscraper in Charlotte, North Carolina. It was completed in 2007 and has 28 floors. There are 200 hundred residential units....
 case in 1965, a federal court's appeals ruled in favor of the Royal Tops Company, determining that yo-yo had become a part of common speech and that Duncan no longer had exclusive rights to the term. As a result of the expenses incurred by this legal battle as well as other financial pressures, the Duncan family sold the company name and associated trademarks in 1968 to Flambeau Plastics, who had manufactured Duncan's plastic models since 1955. Flambeau Plastics continues to run the company today.

The 1970s and the rise of the ball bearing


The 1970s saw a number of innovations in yo-yo technology, primarily dealing with the connection between the string and the axle. In 1978, dentist and yo-yo celebrity Tom Kuhn patented the “No Jive 3-in-1” yo-yo, creating the world's first "take-apart" yo-yo, which enabled yo-yo players to change the axle.

Soon afterwards in 1980, Michael Caffrey patented what would later become the Yomega Brain, a yo-yo with a centrifugal clutch transaxle. Designed with a free-spinning plastic sleeve linkage, "The Brain" could spin much longer than previous fixed-axle designs. In addition, the axle was "clutched" with spring-loaded weights which would pull away from the axle at higher speeds and grab again at lower speeds. The result is an automatic return of the yo-yo when speed drops below a given threshold.

Swedish bearing company SKF
SKF

SKF, Svenska Kullagerfabriken AB, later AB SKF, is a Sweden rolling-element bearing company founded in 1907, supplying bearings, seal , lubrication and lubrication systems, maintenance products, mechatronics products, power transmission products, customer solutions and related services globally....
 briefly manufactured novelty yo-yos with ball bearings in the 1970s.

In all transaxle yo-yos, ball bearings significantly reduce friction when the yo-yo is spinning, enabling longer and more complex tricks. Subsequent yo-yoers used this ability to their advantage, creating new tricks that had not been possible with fixed-axle designs.

1990s technological renaissance

The 1990s saw a resurgence of the popularity of the yo-yo and yo-yo culture.

Continued development of yo-yo technology is evident in the widespread sale of the Yomega Brain, based on Michael Caffrey's design, and the Playmaxx Pro-yo, a take-apart fixed axle yo-yo.

In 1990, Tom Kuhn released the SB-2 yo-yo (short for Silver Bullet 2), a high-performance ball bearing transaxle made with aluminum. This marked a major breakthrough for the modern yo-yo, as it was the first ball bearing yo-yo that actually worked. This ensured extremely long spin times and the ability to return as well. This yo-yo, (along with his many other accomplishments in the yo-yo world), eventually brought him the title "Father of the modern yo-yo," receiving the "Donald F. Duncan Family Award for Industry Excellence" in 1998. He was the first to receive this award.

In the late 1990s, Yomega partnered with HPK Marketing and helped fuel the yo-yo boom that spread across the globe. From this partnership, Team High Performance was born, a group of skilled demonstrators that toured the world. In this period, Yomegas were heavily marketed in Japan, where Bandai
Bandai

is a Japanese toy making company, as well as the producer of a large number of plastic model kits. It is the world's third largest producer of toys. Some ex-Bandai group companies produce anime and tokusatsu programs....
 produced several yo-yos under the Yomega name which were sometimes different from those sold in the US.

At the turn of the century, 1999-2000, Yomega partnered with McDonald's and distributed a large number of Yomega X-Brain and Firestorm yo-yos at outlets throughout the US.(blue)

Another development around this time included the use of different materials such as billet machined Aluminum as seen in the ‘Dif-e-Yo’ Range.

Contemporary yo-yo culture


Yo-yo contests

Us Yoyo National 2a
The International Yo-Yo Open is the largest yo-yo contest in the world. It is held every year in August at South Street Seaport in New York City. This contest is hosted by YoYoNation.com and aims to showcase the best yo-yo players in the world. In the inaugural 2007 contest, there were over 8,500 people in attendance and the event received almost 30 million media impressions. More information about this event can be found at YoYoOpen.com.

The World Yo-Yo Contest
World Yo-Yo Contest

The World Yo-Yo Contest is the top contest of a hierarchy of yo-yo contests from around the world. As of 2006, 19 countries fed into the World Yo-Yo Contest from their respective national yo-yo contests....
 is held every year in Florida, USA during early August or late July. This contest takes the winners from national yo-yo contests around the world and pits them against each other. Japanese players in particular have risen to the top of the yo-yo world. The six-time, double-handed world champion Shinji Saito—considered the best in the world—is Japanese. Countries such as the United States, Brazil, Japan and the UK hold competitions at the national and regional levels. In addition, national yo-yo contests, without regionals, are held every year by Mexico, Taiwan, Singapore, Hong Kong, Korea, France, Germany, Switzerland, The Czech Republic, Hungary, and Australia.

A yo-yo competition normally consists of two parts, a set of compulsory tricks and a freestyle, where points are scored for each and the winner is the yo-yoer who scores the most points. Compulsory tricks (also known as a trick ladder) are a set of tricks that have been chosen before the contest, and the competitor must successfully complete each trick on their first or second attempt to score points. The freestyle is when the yo-ist performs a routine to their choice of music in front of a panel of judges, and is judged based on difficulty of the tricks, synchronization with the music and artistic performance.

The TV Times
TV Times

TVTimes is a television listings magazine published in the United Kingdom by IPC Media, a subsidiary of TimeWarner. It is known for its access to television actors and their programmes....
 world yo-yo championship was held in the United Kingdom in 1974 with heats across the United Kingdom and a final in London in 1975, the championship was sponsored by the Louis Marx toy company with the 'Lumar' brand of yo-yo. The competition was judged by a celebrity panel in each city and also Lumar demonstrator and European yo-yo champion Don Robertson. The winner of the final was Simon Harris
Simon Harris

Simon Harris is predominantly known as the founder of the record label Music of Life, although he is also an influential Disc jockey, award winning Record producer, remixer of several Grammy Award winning artists and pioneer of electronic music....
 (intermediate category). The championship was not repeated.

Us Yoyo National 1a

Contest divisions

Currently there are seven yo-yo divisions to compete in:
  • 1A The player uses a long sleeping yo-yo to perform string tricks which usually require the manipulation of the string.
  • 2A The player uses two yo-yos simultaneously to perform reciprocating or looping tricks. This tends to be the most visually entertaining style with some players incorporating acrobatics into their routines.
  • 3A The player uses two long spinning yo-yos to perform tricks that involve manipulation of the string.
  • 4A The player uses an offstring yo-yo, often releasing the yo-yo into the air and attempting to catch it on the string.
  • 5A The player uses a yo-yo with a counterweight on the other end of the string rather than having it attached to a finger.
  • AP This is Artistic Performance where the yoist uses any type of yo-yo or other prop in order to perform a freestyle.
  • CB This is the Combined Division held only at the world competition, where players have to compete and demonstrate skill in multiple styles.


Competitors usually bring a number of yo-yos to the performance stage with them to allow for mid-routine replacements in the case of knots/jams (common with string tricks), string breakage (common with looping tricks), or drops (common with offstring tricks).

Yo-yo techniques


Sleeping

Keeping a yo-yo spinning while remaining at the end of its uncoiled string is known as sleeping. Sleeping is the basis for nearly all yo-yo tricks other than looping, the player first putting the yo-yo in a "sleep" before throwing the yo-yo around using its string. Most modern yo-yos have a transaxle or ball bearing to assist this, but if it is a fixed axle yo-yo, the tension must be loose enough to allow this. The two main ways to do this are (1), allow the yo-yo to sit at the bottom of the string to unwind, or (2) perform lariat or UFO to loosen the tension.

In competition, mastery of sleeping is the basis for the 1A division. Most inexspensive yo-yos aren't great sleepers compared to expensive yoyos. Inexspensive yo-yos usually spin between 10-25 seconds while expensive yo-yos can spin up to 7 minutes

Looping

Looping is a yo-yo technique which emphasizes keeping the body of the yo-yo in constant motion, without sleeping.

Yo-yos optimized for looping have weight concentrated in their centers so they may easily rotate about the string's axis without their mass contributing to a resistance due to a gyroscopic effect.

In yo-yo competitions, looping plays a strong role in the 2A division.

Off-string

In the off-string technique, the yo-yo's string is not tied directly to the yo-yo's axle, and the yo-yo is usually launched into the air by performing a "forward pass" to be caught again on the string. However, some players can 'throw down' off-string yo-yos and catch it on the string just as it leaves the end of the string by pivoting the string around a finger as it unwinds, so that the yo-yo is caught on the string. This is exactly the opposite of a 'forward pass', but with the same result.

Yo-yos optimized for off-string tricks have flared designs, like the butterfly shape, which makes it easier to land on the string, and often have soft rubber rings on the edges, so minimum damage is inflicted on the yo-yo, the player, or anyone who happens to be standing nearby, should a trick go wrong.

Yo-yo competitions have the 4A division for off-string tricks.

Freehand

In freehand(5A) tricks, the yo-yo's string is not tied to the player's hand, instead ending in a counterweight. The counterweight is then thrown from hand to hand and used as an additional element in the trick.

Developed in 1999 by Steve Brown
Steve Brown (yo-yo player)

Steve Brown is an award winning competitive yo-yo player, competition judge, and yo-yo designer currently based out of Cleveland Heights, Ohio....
, as of 2008 freehand is considered to be the fastest-growing style of yo-yo play. Steve Brown was awarded a patent on his freehand yo-yo system, which was assigned to Flambeau Products (Duncan's
Duncan Toys Company

The Duncan Toys Company is an American toy manufacturer best known for its Yo yo. In 1968 it became a division of Flambeau, Inc.....
 parent company).

In yo-yo competitions, counterweight yo-yos are emphasized in the 5A division.

Yo-yo shapes


Yo-yo bodies come in a number of form factors or "silhouettes," each designed with specific advantages in mind. However, there are three popular configurations.

Tournament or Classic

The tournament or classic shape is often considered the original yo-yo shape, and is very commonly recognized. It's sometimes called a sculpted design. The shape's design is helpful in performing looping tricks. It was first produced by a man named Pedro Flores
Pedro Flores (Yo-yo manufacture)

Pedro Flores is widely considered as the first yo-yo maker in the US and with his Flores yo-yo created the start of an international craze....
 who is also the first person to mass-produce yo-yos. Duncan bought the rights to the design in 1929.

Modified

The modified shape (or Imperial shape) is a very popular design for looping style tricks. This shape is also known as a flywheel or modern shape. It usually has a hollowed face (sometimes covered with paper or plastic) with extra material left in the rim. The modified shape yo-yo is also used for string tricks because of the long spin times due to its shape.

Butterfly

Debuting in 1958, the butterfly has a wider string gap to make it easier to catch the yo-yo body on the string. The butterfly looks a bit like the separated halves of a standard yo-yo that have been reconnected back-to-back. Although the butterfly shape is good for 'string tricks,' it's not good for 'looping' tricks, because the winged shape of the body does not allow it to easily flip while looping. This shape is similar to a small Diabolo
Diabolo

The diabolo is a juggling prop consisting of a spool which is whirled and tossed on a string tied to two sticks held one in each hand. A huge variety of tricks are possible using the sticks, string, and various body parts....
, itself derived from the Chinese yo-yo
Chinese yo-yo

The Chinese yo-yo is a toy from China consisting of two equally-sized discs connected with a long axle. The Chinese yo-yo is kept spinning on a string tied to two sticks at its ends....
.

Newer Shapes

Introduced to the "yo-yoing community" only within the past few years, many yo-yos are being produced with wide-gaps, H-shapes, and dimples. Wide-gap yo-yos are not exclusive to any one yo-yo manufacturer and as their name suggests, have a wider gap. The wide gap allows more layers of string to be stacked in the yo-yo, and tricks using string slack or lacerations. With the blessing comes somewhat of a curse in which the yo-yo does not return to the player's hand unless bound through the use of a front or under mount. H-shaped yo-yos are much like the butterfly-shaped, but the center (toward the bearing/axle) is offset to a smaller diameter to add to circumferential weight and allow for easy "grinding" tricks. Utilizing the technology of a golf ball, dimples are found in Roo-Yo (Italian yo-yo manufacturer) yo-yos and reduce air friction.

Other Shapes

There are, of course, many other shapes. Other less popular shapes are: Humphrey, Ball, Slimline, Russell Style (Bulge Face), Puck, Satellite, Coaster and Riveted Disk.

Weight distribution

Each silhouette may have more weight distributed at either the center of the yo-yo or the rim. More weight towards the rim will make the yo-yo more stable for string tricks; more weight towards the center will make the yo-yo easier to turn and therefore better for looping tricks.

Heavier yo-yos will have more angular momentum when spinning at a given speed, and thus will spin freely for a longer period.

Yo-yo innovations


Body

Most modern yo-yos are made from a "take-apart" design, designed to be taken easily apart and reassembled by the player. This design was created by Donald F. Duncan, Jr. This enables the replacement of yo-yo components, including the string, renewable friction sources, or even trans-axle components.

Some take-apart designs allow the player to reconfigure the yo-yo's halves. In the Tom Kuhn No Jive 3-In-1, the halves may be attached in three different configurations, resulting in a traditional, butterfly, or "pagoda" silhouette. In the Yo-yo Factory FlyMaster, the body has two different "shells" to convert to and from an off-string yo-yo.

Another innovation to the yo-yo is the ability to adjust the gap between the two halves of the yo-yo, in order to increase or decrease response. In most designs, this is accomplished by twisting the yo-yo halves, but some designs (such as the Tom Kuhn Silver Bullet) can be disassembled for adjustment without twisting. This second option eliminates the possibility of the yo-yo coming out of adjustment during play.
  • John Jerome McAvoy, Jr. was awarded patents for the gap-adjustable yo-yo: patent #5389029 on February 14, 1995, and #6066024 on May 23, 2000.
  • In 1998, HSPIN launched the Handquake series of yoyos, which sported an adjustable gap by using shims of 0.1-0.5mm thickness. By adding or removing shims, the gap could be widened or shrunk by +/- 1mm.
  • Harry Baier (creator of the "Mondial" yo-yo) and the Flambeau Products Company (owner of Duncan) were awarded patent #6162109 on December 19, 2000 for a gap-adjustable yo-yo which has discrete positions for specific gap widths. This patent is now implemented in the Duncan Mondial.
  • YoYoFactory's productline of Speed Dial yo-yo's feature "Fully Adjustable Starburst Technology" which allow the gap to be adjusted using a dial on the yo-yo. This allows for a more discrete response setting that stays the same after the yo-yo is taken apart and put back together.


Axle/bearing differentiation

The basic innovation since the 1990s is the transaxle, a system where the string is not directly connected to the axle that connects the two halves of the yo-yo.
  • Fixed axle yo-yos are represented by the original yo-yo design popularized in the first half of the 20th century, where the axle is directly connected to the string and halves of the yo-yo body. In order to enable the throwing of a "sleeper", the player must ensure the string is not wound too tightly around the axle, because it must freely spin in order to accomplish this move. Yo-yos designed for "looping" tricks tend to be fixed-axle yo-yos.
    • Some more exotic fixed-axle yo-yos have axles made from low-friction materials such as ceramic alloys-- this allows for easier "sleeping," which is essential for string tricks.
  • The majority of trick yo-yos sold are Bearing transaxle yo-yos. In these transaxle yo-yos the string is not connected to the axle directly, but rather it is wrapped about a ballrace bearing. The bearing, in turn, surrounds the true axle of the yo-yo. In this way, the body of the yo-yo may spin freely about the string's point of contact.
    • There are transaxle systems which do not use a ball bearing, such as the Duncan ProFire and Yomega Fireball. These use a low-friction metal or plastic collar around the axle.
  • The clutch transaxle, innovated by Yomega with the Yomega Brain, is a transaxle that can be engaged or disenganged.
    • the Yomega Brain is a centrifugal clutch transaxle-- when spinning at a sufficiently high speed, counterweights inside the yo-yo body disengage the axle, automatically allowing the yo-yo to "sleep." Conversely, when the speed slows below the threshold, the yo-yo will return automatically.
    • Other clutch transaxles feature a manual switch which can engage or disengage the axle.


Friction sources

With the innovation of the transaxle, the notion of a yo-yo's response has become important to players. The "response" is a qualitative estimate of how easily the yo-yo will exit a "sleep" and return to the hand of the player.
  • A starburst is a series of bumps molded into the surface of the plastic of each half of the yo-yo. The bumps form a star pattern, radiating out from the axle. Because the starburst is made of the same material as the yo-yo body, it tends to last the life of the yo-yo, but the yo-yo's responsiveness cannot be adjusted for the same reason.
  • An O-ring response system is a rubber ring embedded in a recessed groove in the inside side wall of each half of the yo-yo body, surrounding the axle. Because it is made of a weaker material than the body, it wears down and is designed to be replaceable.
  • Silicone
    Silicone

    Silicones are largely inert, man-made compounds with a wide variety of forms and uses. Typically heat-resistant, nonstick, and rubberlike, they are commonly used in cookware, medicine, sealants, adhesives, lubricants, and insulation....
    , like the O-ring, is a rubber component recessed into the side of the yo-yo around the axle.
  • Friction stickers, popularized by Duncan, are O-shaped stickers that affix to the inside wall of each half of the yo-yo body, and are slightly tacky to the touch. They are made to be replaceable. Many brands of friction stickers are now produced. Each give a unique feeling to the yo-yo. They are commonly made out of silicone, rubber, or a cloth material.
  • Hybrid,Is a combination of either O-ring and Starburst,O-ring and a Friction sticker,Starburst and a friction sticker and so on. This is mostly found in butterfly shaped yo-yos.Also it is mostly used by yoyojam.


Side Bearing Caps

Side Bearing Caps are when bearings are added to the hub of a yo-yo and covered with some form of side cap to allow it to be held while it spins. With the side cap bearing you can hold the yo-yo in many different planes and perform different styles of tricks, that can't be perform with the conventional yo-yos. Side Bearing Caps are also commonly known as side bearings, bearing caps (Anyyoyo), Synergy caps (Yoyojam), Jimmy Hats (Werrd) and hubstacks (YoYoFactory). One of the problems associated with side bearings is the tendency for the bearings to fall off. YoYoFactory currently has a patent pending design that uses rubber rings to hold the bearing by its seat onto the side hubs, keeping the bearing on the yo-yo.

Performance accessories

A number of yo-yo accessories are available as "after-market" modifications-- players buy items separately from the yo-yo to augment performance over the original model shipped from the factory.
  • Ceramic bearings tend to spin longer and be more durable.
  • Dif-E-Yo Konkave bearings are tapered inward on the perimeter, to force the string into the center of the axle to prevent the string from rubbing on the sides of the yo-yo.
  • Friction stickers different "grips" other than the ones shipped with the yo-yo, are available as a separate purchase to customize the user's style of play.
  • Brake Pads Similar to friction stickers, however they break down quicker and can only be used in specific yoyos.
  • High-tensile, Slick Strings, generally made from polyester and cotton, is added by some players to improve sleep times (thinner string touches less of the yo-yo gap) and for better looping (low friction string performs "faster" and will not break as easily).
  • Weight rings are affixed to the yo-yo's rim to increase the weight and percentage of mass at the yo-yo's rim, thus improving sleep time.

Modifications

Some yo-yoers have their yo-yo modified (or modded) by themselves or by a yo-yo 'Modder'. Some of the most popular mods are:
  • Satining, sanding the outside of the yo-yo with high grit sandpaper to improve grinds.
  • Beadblasting, usually only done on metal yo-yos, is abrasive blasting the yo-yo with glass beads to slightly pit the surface improving grinds.
  • Siliconing, is filling the friction sticker recess with silicone to change the response of the yo-yo.
  • 'Shmooving', cutting small shallow grooves into the face of the yo-yo, where the string rubs, to reduce friction and increase sleep times.
  • Dyeing, is exactly what it says, dyeing a plastic yo-yo to change it's color or add a design.
  • Anodizing, only done on metal yo-yos, changes the color of a metal yo-yo and increases durability slightly.


Exotic materials

Originally manufacturing yo-yos from wood, yo-yo technology improved in the 1960s when the industry switched to plastic. A plastic yo-yo has a uniform weight distribution and is unaffected by the variations in density that plague wood yo-yos.

Increasingly, the highest of high-end Yo-yos are being made of metal, normally aluminum, steel, titanium, and very rarely, magnesium and tungsten alloys.

Exotic plastics are also coming into play: the "Milk," by manufacturer Born Crucial; the "Silk," by manufacturer Alchemy; and the "Gung Fu," by manufacturer Death by Yo Yo, are made almost entirely from the low-friction plastic Delrin. Yo-yos made from Delrin are also just as high end as metal ones. Also a yoyo called the "jamboo" manufactured by "yoyojam" is a free spin ball bearing yoyo its made of bamboo which is probably going to be an inspiration to future of yoyo products.

Physical mechanism

The operation of a yo-yo comes from rotational inertia
Moment of inertia

Moment of inertia, also called mass moment of inertia or the angular mass, is a measure of an object's resistance to changes in its rotation rate....
 causing the string to be wound in the opposite direction returning the yo-yo. When the string is connected to the shaft with a loop, the yo-yo will continue to spin at the end of the string instead of returning, unless the yo-yo is jerked slightly allowing the slack string to bind and allowing return.

Patents have been issued to create more complicated mechanisms to allow tension control and an adjustable mechanism.

5 year cycle

The yo-yo tends to go through 5 year cycles of popularity. Once the popularity of yo-yo's amongst kids wanes, yo-yo companies go on a marketing campaign every 5 years to bring back yo-yo's into the public consciousness, which is usually a successful tactic.

The yo-yo in popular culture

The yo-yo and yo-yoing have been a part of popular culture for nearly a century, and it is hardly surprising that yo-yos appear in many fictional works and even historical events.
  • In the NES
    Nintendo Entertainment System

    The Nintendo Entertainment System is an 8-bit video game console that was released by Nintendo in North America, Europe and Australia in . In most of Asia, including Japan , the Philippines, China, Vietnam and Singapore, it was released as the ....
     video games StarTropics
    StarTropics

    StarTropics is an Action-adventure game released by Nintendo in 1990 in video games for the Nintendo Entertainment System. Unlike most of Nintendo's games, it was never released or intended to be released in Japan....
    , the main character, Mike Jones, use a yo-yo for combat.
  • In the SNES title Earthbound
    EarthBound

    EarthBound, known in Japan as , is a Console role-playing game video game co-developed by Creatures Inc. and HAL Laboratory and published by Nintendo for the Super Nintendo Entertainment System video game console....
    , the main character Ness
    NESS

    NESS may refer to:*New England Skeptical Society* at Newcastle University*Nottingham Exchange Students Society...
     can equip and use yo-yos in battle. He also utilizes them in Super Smash Bros.
    Super Smash Bros.

    is a fictional crossover fighting game video game developer by HAL Laboratory and video game publisher by Nintendo for the Nintendo 64. It was released in Japan on January 21, 1999, in North America on April 26, 1999, and in Europe on November 19, 1999....
  • In the Nintendo DS
    Nintendo DS

    The is a dual-screen handheld game console developed and manufactured by Nintendo. It was released in 2004 in video gaming in Canada, the United States, and Japan....
     title Kirby Super Star Ultra, the protagonist Kirby
    Kirby

    Kirby is a common place name, surname, and given name, derived from Old Norse, meaning church settlement. Other common uses include. Also the name Kirby is sweet and used often in family rituals where babies get named....
    , with the Yo-yo copy ability, can utilize yo-yos.
  • In 1968, activist Abbie Hoffman
    Abbie Hoffman

    Abbot Howard "Abbie" Hoffman was a social and political activism in the United States who co-founded the Youth International Party . Later he became a fugitive from the law, living under an alias and working as an enviromentalist following a conviction for dealing cocaine....
     was cited for contempt of Congress
    Contempt of Congress

    Contempt of Congress is the act of obstructing the work of the United States United States Congress or one of its United States Congressional committee....
     for, amongst other acts, "walking the dog" during a session of the House Subcommittee on Un-American Activities.
  • In 1974 President
    President of the United States

    The President of the United States is the head of state and head of government of the United States and is the highest political official in the United States by influence and recognition....
     Richard Nixon
    Richard Nixon

    Richard Milhous Nixon was the List of Presidents of the United States President of the United States and the only president to resign the office....
     briefly played with a yo-yo at the Grand Ole Opry
    Grand Ole Opry

    The Grand Ole Opry is a weekly country music radio programming and concert broadcast live on WSM radio in Nashville, Tennessee, Tennessee, every Friday and Saturday night, as well as Tuesdays from March through December....
     in Nashville
    Nashville, Tennessee

    Nashville is the Capital of the U.S. state of Tennessee and the county seat of Davidson County, Tennessee. It is the second most populous city in the state after Memphis, Tennessee....
    .
  • The 1976 anime Combattler V
    Combattler V

    is the first part of the Robot Romance Trilogy of Super Robot series created by "Saburo Yatsude" and directed by Tadao Nagahama. The robot's name is a portmanteau of Combine, Combat and Battle, and the V is intended both as an abbreviation for "victory" and in reference to the five component machines that form the robot, as well...
     had the super robot Combattler V use a yo-yo type weapon aptly called the Chodenji (Super Electromagnetic) Yo-yo.
  • In 1986 the Smothers Brothers
    Smothers Brothers

    The Smothers Brothers are an United States music-and-comedy team, consisting of the brothers Tom Smothers and Dick Smothers. The brothers' trademark act was performing folk songs , which usually led to arguments between the siblings....
     introduced the song "Yo-Yo Man" into their act. Partway through the song, Tom would "enter into a state of Yo", which supposedly gave him enhanced yo-yo wielding ability while depriving him entirely of the power of speech. (This conveniently eliminated the need to stand near the microphone.) Dick provided a reverent and strangely metaphysical running commentary for Tom's performance.
  • A yo-yo craze features prominently in the 1992 Simpsons episode Bart the Lover
    Bart the Lover

    "Bart the Lover" is the sixteenth episode of The Simpsons List of The Simpsons episodes#Season 3 which is an early look at the personal life of Mrs....
    . In the story, a yo-yo manufacturer puts on an elaborate production of children doing yo-yo tricks in order to boost sales.
  • Gregory House in the TV series House
    House (TV series)

    House, also known as House, M.D., is an American medical drama that debuted on the Fox Broadcasting Company network on November 16, 2004....
     is often seen playing with a yo-yo whilst pondering complex ideas.
  • The fourth incarnation of The Doctor
    Doctor (Doctor Who)

    The Doctor is the central fictional character in the long-running BBC Science fiction on television series Doctor Who, and also features in a vast range of spin-off novels, audio dramas and comic strips connected to the series....
     (played by Tom Baker
    Tom Baker

    Thomas Stewart "Tom" Baker is an England actor and comedian. He is best known for playing the Fourth Doctor of Doctor from 1974 to 1981 in Doctor Who, and for narrating Little Britain....
    ), in the long running BBC science fiction
    Science fiction

    Science fiction is a broad genre of fiction that often involves speculations based on current or future science or technology. Science fiction is found in books, art, television, films, games, theatre, and other media....
     series Doctor Who
    Doctor Who

    Doctor Who is a British Science fiction on television programme produced by the BBC. The programme depicts the adventures of a mysterious alien Time travel known as "Doctor " who travels in his space and time-ship, the TARDIS, which normally appears from the exterior to be a blue 1950s police box....
     is seen playing with a yo-yo from time to time. He claims in the episode "Ark in Space" that he is playing with the yo-yo to judge the gravitational field present on a space station
    Space station

    A space station is an artificial structure designed for humans to live in outer space. So far only low earth orbit stations are implemented, also known as orbital stations....
    .
  • In the Guilty Gear video game series, the character Bridget uses a yo-yo as one of his main weapons.
  • In the NES
    Nintendo Entertainment System

    The Nintendo Entertainment System is an 8-bit video game console that was released by Nintendo in North America, Europe and Australia in . In most of Asia, including Japan , the Philippines, China, Vietnam and Singapore, it was released as the ....
     video games Yo! Noid
    Yo! Noid

    Yo! Noid is a platform game video game released in the United States for the Nintendo Entertainment System by Capcom during November, 1990. It stars the Noid, the former claymation mascot of Domino's Pizza, traipsing through fourteen different side-scrolling levels throughout various locations of New York City to battle his evil duplicate...
    , and The Goonies 2 the main characters use a yo-yo as the main weapon.
  • In the MMORPG Flyff the Acrobat character class, along with the Jester subclass, can use yo-yos as a weapon.
  • In the cartoon Recess
    Recess (TV series)

    Recess is an USA cartoon series that was created by Paul Germain and Joe Ansolabehere, and produced by Walt Disney Television Animation. Recess focuses on six elementary school students and their interaction with other classmates and teachers....
     an episode features one of the main characters, Gretchen, learning to yo-yo, and then competing in a yo-yo competition.
  • In the Japanese Anime Yu Yu Hakusho, team Rokuyukai first fighter, Rinku is master of the Serpent Yo-Yo, an attack that transfers his spirit energy into the strings of the yo-yo causing them to act as if they are extensions of his own body.
  • The Detention
    Detention (TV series)

    Detention is a cartoon that premiered on Kids' WB! on September 11, 1999 and was created by Bob Doucette . This is one of the shortest lived programs by Warner Bros....
     character Duncan is almost always seen with a yo-yo, and uses it to communicate with the other characters.
  • In the Japanese movie Yo-Yo Girl Cop
    Yo-Yo Girl Cop

    is a Japan live action film by Kenta Fukasaku, in the Sukeban Deka franchise.Yo-Yo Girl Cop stars Aya Matsuura with the lead role as Saki Asamiya and Rika Ishikawa cast as her rival, Reika Akiyama....
    , by Kenta Fukasaku, the lead character uses a Yo-Yo as her primary weapon.
  • In R.A. Salvatore's The Cleric Quintet
    The Cleric Quintet

    The Cleric Quintet is a series of novels set in the Forgotten Realms universe about the character Cadderly Bonaduce written by R. A. Salvatore....
     the main character, Cadderly Bonaduce uses "Spindle Discs" as a weapon. The description of this weapon makes it obvious that it is a yo-yo.
  • Dr. Lucky Meisenheimer
    Lucky Meisenheimer

    Lucky Meisenheimer M.D. is a Physician, Athlete, Author and Actor. He is best known for his book Lucky?s Collectors Guide to 20th Century Yo-Yos and his Guinness world record collection of yo-yos....
     has the largest collection of yo-yos in the world as certified by Guinness
    Guinness

    Guinness is a popular dry stout that originated in Arthur Guinness' first brewery in Leixlip, County Kildare but it then moved to its present home at St....
    . He also has produced a periodic table of yo-yos.
  • In the animated television series Hey Arnold!
    Hey Arnold!

    Hey Arnold! was an United States animated television series that aired from October 7, 1996 until June 8, 2004 on Nickelodeon ....
     Eugene's pet fish Henry was accidently killed by Arnold with a yo-yo.