Roller coaster

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The roller coaster is a popular amusement ride developed for amusement parks and modern theme parks. LaMarcus Adna Thompson patented the first roller coaster on 20 January, 1865. In essence a specialised railroad system, a coaster consists of a track that rises and falls in specially designed patterns, sometimes with one or more inversions (the most common being loops) that turns the rider briefly upside down. The track does not necessarily have to be a complete circuit (the antonym of complete circuit is "shuttle"), though some purists insist that it must to be a true coaster. (Not all thrill rides that run on a track are roller coasters). Most coasters have cars for two, four, or six passengers each, in which the passengers sit to travel around the circuit. An entire set of cars hooked together is called a train.

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Mechanics

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The cars on a typical roller coaster are not self-powered. Instead, a standard full-circuit lift-powered coaster is pulled up with a chain or cable along the lift hill to the first peak of the coaster track. Then potential energy becomes kinetic energy as the cars race down the first downward slope. Kinetic energy is converted back into potential energy as the train moves up again to the second peak. This is necessarily lower as some mechanical energy is lost due to friction. Then the train goes down again, and up, and so on. However, not all coasters run this way. The train may be set into motion by a launch mechanism (flywheel launch, linear induction motors, linear synchronous motors, hydraulic launch, compressed air launch, drive tire, etc.). Some coasters move back and forth along the same section of track; these roller coasters are called shuttles because of this motion and usually run the circuit once with riders moving forwards and then backwards through the same course. Some roller coasters are powered by a kind of locomotive.

A properly designed roller coaster under good conditions will have enough kinetic, or moving, energy to complete the entire course, at the end of which brakes bring the train to a complete stop and it is pushed into the station. A brake run at the end of the circuit is the most common method of bringing the roller coaster ride to a stop.

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Blocking

Most large roller coasters have the ability to run two or more trains at once. These rides use a block system, which prevents the trains from colliding. In a block system, the track is divided into multiple sections or blocks. Only one train at a time is permitted in each block. At the end of each block, there is a section of track where a train can be stopped if necessary (either by preventing dispatch from the station, closing brakes, or stopping a lift). Sensors at the end of each block detect when a train passes so that the computer running the ride is aware of which blocks are occupied. When the computer detects a train about to travel into an already occupied block, it uses whatever method is available to keep it from entering.

The above can cause a cascade effect when multiple trains become stopped at the end of each block. In order to prevent this problem, ride operators follow set procedures regarding when to release a newly-loaded train from the station. One common pattern, used on rides with 2 trains, is to do the following: hold train #1 (which has just finished the ride) right outside the station, release train #2 (which has loaded while #1 was running), and then allow #1 into the station to unload.

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History

The earliest roller coasters descended from Russian winter sled rides held on specially constructed hills of ice, especially around St Petersburg. They were usually built 70 to 80 feet tall and consisted of a 50 degree drop. By the late 1700s their popularity was such that entrepreneurs elsewhere began copying the idea, using wheeled cars built on tracks. One such company was 'Les Montagnes Russes à Belleville' which constructed and operated a gravity track in Paris from 1812. The first loop track was probably also built in Paris from an English design in 1846, with a single-person wheeled sled running through a 13-foot diameter loop. None of these tracks were complete circuits.

The first roller coasters in the USA were based on gravity switchback trains developed in the 1880s. These primitive coasters were run to provide amusement by railroad companies on weekends when ridership was lower. The earliest complete circuit track appeared in 1884, and in 1885 Phillip Hinkle introduced the concept of the "lift hill."

As roller coasters grew in popularity, experimentation in coaster dynamics took off. As early as the 1880's the concept of a vertical loop was explored, and in 1895 the concept came into fruition with The Flip Flap, located at Sea Lion Park in Brooklyn. The ride was incredibly dangerous. Many passengers suffered whiplash and snapped necks. It was soon dismantled and looping coasters had to wait for over half a century.

By 1912, the first underfriction coaster was developed by John Miller, often called the Thomas Edison of roller coasters. Soon, roller coasters spread to amusement parks all around the United States and the rest of the world. Perhaps the best known historical roller coaster, The Cyclone, was opened at Coney Island in Brooklyn, New York in 1927. Like The Cyclone, all early roller coasters were made of wood. Many old wooden roller coasters are still operational, at parks such as Kennywood near Pittsburgh, Pennsylvania and Blackpool Pleasure Beach, England, UK.

The Great Depression marked the end of the first Golden Age of Grotesque (after Mechanical Animals). Theme parks in general went into a decline that lasted until 1972, when the Racer was built at Kings Island in Mason, Ohio (near Cincinnati). Designed by John Allen, the instant success of the Racer began a second golden age, which continues through this writing (2006).

In 1959, the Disneyland theme park introduced a new design breakthrough in roller coasters with the Matterhorn Bobsleds. This was the first roller coaster to use a tubular steel track. Unlike conventional wooden rails, tubular steel can be bent in any direction, which allows designers to incorporate loops, corkscrews, and many other manoeuvres into their designs. Most modern roller coasters are made of steel but wooden roller coasters are still being built.

Some of the major variations in contemporary roller coaster design involve the modification of the car. Some seat the passenger in a bodyless frame, with the passenger's legs dangling in the air and providing a less obstructed view of the ground, thus providing an extra scare to the passengers. Another variation involves cars that have the riders in a standing position (though still heavily strapped in). Finally, some roller coasters spend some or all of their travel time with the passengers sitting in the opposite direction to their travel, so they cannot see what direction the coaster will travel next.

New roller coaster designs and state of the art technology push the physical limits on what type of experiences can be had on the newest coasters. For example, coasters like the Incredible Hulk Coaster feature launch lift hills to create an unique experience.

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Safety

Because roller coasters are intended to feel risky, accidents, such as the September 5, 2003 fatality at the seemingly tame Disneyland Big Thunder Mountain Railroad, attract public attention.

Statistically, roller coasters are very safe. The U.S. Consumer Product Safety Commission estimates that 134 park guests required hospitalization in 2001 and that fatalities related to amusement rides average two per year. According to a study commissioned by Six Flags, 319 million people visited parks in 2001. The study concluded that a visitor has a one in one-and-a-half billion chance of being fatally injured, and that the injury rates for children's wagons, gum chewing, golf, and folding lawn chairs are higher than for amusement rides. In fact, driving to the amusement park has a higher risk of injury than riding the rides at the amusement park.

Nevertheless, accidents do occur. Regulations vary from one authority to another. Thus in the USA, California requires amusement parks to report any ride-related accident that requires an emergency room visit, while Florida exempts parks whose parent companies employ more than 1000 people from having to report any accidents at all. Rep. Ed Markey of Massachusetts has introduced legislation that would give oversight of rides to the Consumer Product Safety Commission (CPSC).

In 1999, a rider who weighed more than 180 kg (400 pounds) was unable to close his lap bar properly and was thrown from the Superman coaster at Six Flags Darien Lake, sustaining serious injuries. Despite this, a similar accident occurred in 2004 when a 100 kg (230 pound) man with cerebral palsy was permitted to board the Superman coaster at Six Flags New England and, on the last turn of the ride, was thrown from his seat and killed. Critics maintain that, despite the generally good safety record, accidents are occurring that are preventable.

In recent years, controversy has arisen about the safety of the increasingly extreme rides. There have been suggestions that these may be subjecting passengers to translational and rotational accelerations that may be capable of causing brain injuries. In 2003 the Brain Injury Association of America concluded in a report that "There is evidence that roller coaster rides pose a health risk to some people some of the time. Equally evident is that the overwhelming majority of riders will suffer no ill effects."

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Types of roller coasters

Today, there are two main types of roller coasters: Steel roller coasters and Wooden roller coasters (also called 'Woodies'). Steel coasters are known for their smooth ride and often convoluted shapes that frequently turn riders upside-down via inversions known as loops, corkscrews, pretzels, and other descriptive names. Wooden coasters are fondly looked at by coaster enthusiasts for their more rough ride and "air-time" produced by negative G-forces when the coaster car reaches the top of some hills along the ride. Much debate can be had regarding which coaster type is better, as they both have their pros and cons.

Regardless of the type of roller coaster being built, coasters come in a multitude of designs. Some designs take their cue from how the rider is positioned to experience the ride. Traditionally, coaster riders sit facing forward in the coaster car, while newer coaster designs have ignored this tradition in the quest for building more exciting, unique ride experiences for the riders. In addition to changing the rider's viewpoint, coaster designs also focus on track styles to make the ride fresh and different from other coasters.

One method of designing a coaster is to select one item from each of the different coaster options: height, rider experience, track design, and launch mechanics. These four elements combine to make a unique coaster for the park.

(See Notable roller coasters for coasters that are known to be first in each category.)

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Rider Experience

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Height-specific

Some names originated by Cedar Point, a pioneer in breaking height records, have become general parlance for coasters in certain height categories.

  • Strata Coaster - between 400-499 feet tall
  • Giga Coaster - between 300-399 feet tall
  • Hypercoaster - between 200-299 feet tall
  • Kilo Coaster - maximum height of 100-199 feet
  • Intermediate Coaster - maximum height of 50-99 feet
  • Family Coaster - maximum height of 30-49 feet
  • Junior Coaster - maximum height of 20-29 feet
  • Kiddie Coaster - maximum height of 0-19 feet
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Track Design

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Mechanics

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Designers and Manufacturers

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Coaster Clubs

There are numerous organizations of people who enjoy roller coasters. Members usually pay a fee to be a part of the club in exchange for discounts and perks, sometimes from the parks themselves. They include

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See also

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External links


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