Zipper (ride)

The Zipper is a carnival ride designed in 1968 by Chance Rides Manufacturing, Inc., an American manufacturer of amusement rides based in Wichita, Kansas. The ride is noted for exerting higher g-forces on its riders than most amusements. The Zipper is a very popular attraction at many fairs and carnivals.

Description

It has a long oblong frame (the boom) that rotates like a Ferris wheel, with free-flipping cars suspended on off-center axes that move around the sides of the boom via pulley system. Each passenger capsule is essentially a bench seat that snugly fits two people, built into a compartment of metal mesh contoured to protect the riders' entire bodies. The odd, apostrophe-shaped capsules, spaced evenly along the perimeter of the boom look very much like the rows of interlocking teeth on a zipper, for which the ride was named.

The passenger capsules travel around the perimeter of the boom at 4 rpm, not particularly fast, but the "flip" around the end of the oblong frame causes a sudden burst of speed and sends the compartments flipping end over end. The boom itself rotates at 7 rpm in the same direction as the pulley system. This combined but offset rotation provides each capsule with a unique and unpredictable experience. Zippers are capable of rotating both clockwise and counter-clockwise, and most are run with several rotations in each direction constituting "one ride".

Like all carnival equipment, the Zipper is designed to be portable. It can be disassembled onto a [http://www.flatrides.com/Ride%20Index/ChanceZipper3.jpgtruck] and transported from site to site.

The ride is no longer featured on Chance Morgan's website catalog; [ Chance Morgan Amusement Manufacturer web site, Thrill Rides Page [http://www.chancemorgan.com/thrillrides3.html] ] sparking the assumption that the Zipper is no longer manufactured.

afety Issues

The first fourteen Zippers manufactured spun at much higher speeds than modern models. The boom rotated at 11 rpm and the cable system at 7 rpm. These first-generation rides kept the passenger compartments spinning on their axes constantly, creating unsafe g-forces and causing impact-related injuries such as whiplash, bruises and back injuries. The safety hazard was quickly discovered and the mechanical rpms permanently lowered to current speeds.

On September 7, 1977, the Consumer Product Safety Commission issued a public warning, urging carnival-goers not to ride the Zipper after four deaths occurred due to compartment doors opening mid-ride. The safety restraints being attached to the door itself, riders are left unrestrained whenever the door is open. The 1977 victims all died after falling from their compartments. The failure was traced to original spring-close latches on the doors wearing out and not being replaced. Compartments on currently operating Zippers are secured using the original latch, a redundant latch approved by the CPSC, and a large R-Key pin as a third backup.

Despite these new safety features, the same scenario was repeated in July of 2006 in Hinckley, Minnesota when two teenage girls were ejected from the their compartment as the door swung open. Their door was apparently not properly closed by the operator who admitted to local law enforcement that he had not inserted the safety pin (R-Key) before starting the ride. Both of the victims, Erica Matrious and Breanna Larsen, survived the incident despite facing some serious injuries. On November 2, 2006, the girls were interviewed. [ KARE-11 (2006-07-09), "Two hurt in carnival ride accident in Hinckley". [http://www.kare11.com/news/ts_article.aspx?storyid=128905] ]

Many newer models of Zipper have solved this problem by completely restructuring the door lock system, also eliminating the need for an R-key. These newer models have also increased the weight of the compartments, reducing the spinning, which decreases pressure on the door latches.

Most Zipper operators now employ a "no single rider" policy. This is because a person riding alone can turn sideways in the seat, removing their legs from underneath the lap bar, risking serious injury as the capsule spins. The manufacturer sent out a notice to Zipper owners in 1995, pointing out the hazard and recommending the "no single rider" policy. [ Chance Rides, Inc. Service Bulletin B090R1l-5-9A (APRIL 21, l995) [http://www.uscancares.org/mbulletin/151/B090R1169-A.pdf] ]

Technical specifications

* Ride Duration (Recommended): 2 minutes
* Ride Duration (Maximum): 2.5 minutes Dimensions
* Maximum Height: 56 ft (25.5 m)
* Total Ride Weight: 43,000 lb (19,500 kg) Passengers
* Number of Passenger Compartments: Usually 12, some brands/models have 16
* Passengers per Seat: 2 Adults or 3 Children
* Maximum Passenger Weight per Seat: 340 lbs (155 kg)
* Total Passengers: 24 Adults or 36 Children (12-seat Zipper)
* Maximum Total Passenger Weight: 4,090 lbs (1,855 kg) (12-seat Zipper)
* Height Requirement: 48 inches (1.22 m)Mechanical Speed
* Boom: 7.5 RPM
* Cable: 4 RPMDirection of Travel
* Boom: clockwise or counterclockwise
* Cable: clockwise or counterclockwisePower Requirements
* Boom Drive: Electro-hydraulic
* Cable Drive: Electro-hydraulic
* Power Rating: 25 hp (19 kW)Suspension Type: Air Ride

External links

* [http://www.ride-extravaganza.com/rides/zipper/ A comprehensive Zipper website with descriptions and pictures]
* [http://www.domainofdeath3.com/whitetrashcarnierides/zipper/ The Zipper Description]
* [http://www.kare11.com/news/ts_article.aspx?storyid=128905 Zipper Accident News Report]

References