The launched roller coaster is a modern form of roller coaster which has risen to prominence within the last decade. In place of a traditional chain lift, the launched coaster initiates a ride with high amounts of acceleration via one or series of Linear Induction Motors (LIM), Linear Synchronous Motors (LSM), catapults, or other mechanisms employing hydraulic or pneumatic power. These are some of the fastest rides in the world.
Launched coasters mainly feature improved speed, and capability to accommodate more "thrilling" layouts. These coasters, however, can be less reliable than traditional chain-lifted coasters, and are considered to require heavier maintenance.
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Electromagnetic
LIM / LSM
LIM and LSM coasters use propulsion via electromagnets, which utilize large amounts of electricity to propel the coaster train along its track into the ride elements (e.g. inversions, twists, turns and short drops). Five design companies managing these types of rides are Vekoma Industries, Intamin AG, Premier Rides, Maurer Söhne and MACK Rides.
Electricity is transferred into a motor so that it controls the speed at which it will urge the car forward. LIMs are mainly used in Premier Rides roller coasters and Intamin AG impulse coasters. However, LIMs are also used for transport systems and the Tomorrowland Transit Authority in the Magic Kingdom for low acceleration, unlike what most roller coasters use for high acceleration.
Fluid pressure
Hydraulic
Hydraulic-launched roller coasters give the riders high acceleration, yet with improved smoothness, over the electromagnetic and catapult launch mechanisms. The Swiss manufacturer Intamin AG pioneered this new style.
The heart of the system is several (usually eight) powerful hydraulic pumps, each capable of producing 500 horsepower (373 kW).[citation needed] Hydraulic fluid is pumped into several hydro-pneumatic accumulators (energy storing devices) containing two compartments separated by a piston. As the incompressible hydraulic fluid is pumped into one compartment a gas in the other compartment is compressed.
At launch, the fluid under pressure from the accummulators is used to drive a number (typically 16 or 32) of hydraulic motors, which spin a large winch drum that rewinds a cable attached to a catch-car under the train in a matter of seconds. The catch-car moves in a groove in the center of the launch track with the motor at one end, and the waiting train at the other.
While the train inches forward, the pusher moves back from the motor towards the train. Once the pusher connects, the anti-rollback braking system drops beneath the track, giving the train the green light to be launched. The system as a whole is capable of producing up to 20,800 horsepower (15.5 MW) for each launch.[citation needed]
These launches are considered capable of giving a far greater and smoother acceleration than the LIM/LSM styles. The acceleration from a LIM/LSM launch is greatest at the beginning and dies off rapidly towards the end of the launch, but the acceleration from a hydraulic launch remains nearly constant throughout the launch.
The first hydraulic launch coaster was Xcelerator reaching 82 mph (132 km/h) in 2.3 seconds. The world's current tallest and fastest coaster Kingda Ka at Six Flags Great Adventure, which opened in the spring of 2005 is capable of reaching 128 mph (206 km/h) in 3.5 seconds.
Hydraulic launched rides usually have a tower after the launch, with differing layouts afterwards depending on the park's financial resources. Top Thrill Dragster brakes after the tower and Kingda Ka features a single 130 ft (40 m) hill after the tower, while Storm Runner at Hersheypark offers a series of overbanked turns after its 180 foot (55 m) tower drop. Rita - Queen of Speed at Alton Towers doesn't have a tower at all, only airtime hills. Stealth at Thorpe Park has a very large tower that links to the left over the top and then round the track back to the start, this allows for two cars to be on the track at once (one launched & one loading). Xcelerator at Knotts Berry Farm offers two overbanked turns after the tower. Along with the height and speed, these coasters, named "Rocket Coasters" in the industry, are considered more comfortable due to a smoother launch than LIM-style launches.
A recent newcomer to the hydraulic launch industry is Vekoma, who recently opened a coaster called Booster Bike at Toverland in the Netherlands, said to give riders a sensation of racing on high performance motorcycles over a low twisted layout, at speeds up to 47 mph (75 km/h). The cars imitate real motorcycles, and the riders sit in the same posture as real bikers.
Pneumatic
Hydraulic launch technology faces competition from S&S Power, a leading manufacturer in vertical amusement rides, who in recent years created a new breed of coasters with pneumatic launch power. Their coaster model, the Thrust Air 2000, was first built in Kings Dominion under the name Hypersonic XLC. The coaster has been clocked to launch from the rest at station to 80 mph (128 km/h) in 1.8 seconds. The coaster proceeds to ascend a tower at 90 degrees and descends vertically. Another compressed air launched coaster, built in Fuji-Q Highland, is Dodonpa. This coaster is capable of launching passengers from 0 to 106.9 mph (171 km/h) in 1.8 seconds.
Other styles
Catapult
In the catapult launch, a large diesel engine or a dropped weight winds a cable to pull the train until it accelerates to its full speed.
These rides are often not very tall, and usually achieve speeds of 60 mph (96 km/h).
Flywheel
Flywheel launches are used on some Anton Schwarzkopf designed shuttle loop coasters and Zamperla Motocoasters. A large flywheel is spun at high speeds and is attached to a cable that propels the train forward.
Electric Motor and Spring Tension
Arrow Dynamics' Launched Loop coasters, which were popular in the 1970s and 1980s, use a powerful electric motor and tensioned springs to propel a launch car forward. The launch car pushes the train outward to a drop, and then returns to its position. After the train reaches the opposite platform, another catch car works the same way.
Friction Wheels
Another type is launch is by friction wheels. The launch track consists of a series of horizontal tires that pinch the brake fins on the underside of the train. One example of this is the Incredible Hulk Coaster at Universal's Islands of Adventure
External links
- Counterweight launch system on Schwarzkopf rides
- Flywheel launch system on Schwarzkopf rides
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