Bolliger & Mabillard

Walter Bolliger and Claude Mabillard started working for Giovanola, a manufacturing company who supplied rides to Intamin, in the 1970s. During their time at Giovanola, they helped design the company's first stand-up roller coaster, Shockwave at Six Flags Magic Mountain. They also worked on other projects, such as Z-Force at Six Flags Great America.[5] Bolliger & Mabillard left Giovanola, but the company continued to use their track design, so the company's roller coasters, Goliath at Six Flags Magic Mountain and Titan at Six Flags Over Texas, use a track style very similar to B&M's.[6][7]

An inverted model with the angled drop, common on inverted coasters, Batman: The Ride at Six Flags Great Adventure

In 1987, Giovanola underwent a change of management; Bolliger & Mabillard decided to leave and founded their own company.[5] At the time, B&M employed four people, including two draftsmen: Bolliger and Mabillard. When B&M was created, the pair had agreed not to make any more amusement attractions.[8][9] However, Robert Mampe, Six Flags Great America's staff engineer, who had worked with both men during the construction of Z-Force, contacted the new company and asked it to reconfigure the cars for its Giovanola-built, Intamin bobsled coaster that was to be relocated from Six Flags Great Adventure.[10]

Following that project Mampe asked the new company to design and build a stand-up roller coaster for Six Flags Great America, similar to Shockwave at Six Flags Magic Mountain.[10] B&M accepted the offer and hired two more draftsmen. But B&M had a problem regarding how and where to manufacture the track pieces for the roller coaster. With the impression of the work done by Clermont Steel Fabricators on Vortex at Kings Island and Shockwave Six Flags Great America, Walter Bolliger went to the steel plant and asked if they would be interested in manufacturing the track. Clermont Steel Fabricators accepted and currently manufactures all Bolliger and Mabillard roller coaster track pieces for all of North America.[4] Now with a company to manufacture the track, B&M built its first roller coaster, a stand-up roller coaster, Iron Wolf, which opened in 1990 at Six Flags Great America.[8][9] Two years later, Bolliger & Mabillard built another project for Six Flags Great America, Batman: The Ride, the world's first inverted roller coaster, which brought them to prominence in the industry.[11][12]

Bolliger & Mabillard also invented the Floorless Coaster[13] and the Dive Coaster. The company also built its first launched roller coaster, the Incredible Hulk, which is at Islands of Adventure.[14] In 2010, B&M unveiled its new Wing Coaster and premiered the prototype model, named Raptor, at Gardaland in 2011.[15] It has two seats on each side on the car that hang riders over the sides of the track. As of 2019 there are fifteen in operation.[15] In 2015, B&M constructed Thunderbird at Holiday World & Splashin' Safari, its first in-house launched coaster.[16]

By 2010, B&M employed twelve engineers, twelve draftsmen and two draftswomen.[8][9] The company has made other contributions to the roller coaster industry. The company built the trains for the Psyclone, a now-demolished wooden roller coaster at Six Flags Magic Mountain. The trains were later used on the park's Colossus wooden roller coaster (until it was refurbished by Rocky Mountain Construction), but were only used during October each year. The trains faced backward and usually raced against trains on the second track, which ran forward.[17]

In 2013, the company launched the construction of Banshee, the world's longest inverted roller coaster.[18] B&M supplied new trains for Steel Dragon 2000, built by D. H. Morgan Manufacturing in 2000.[19][20] As of 2012, Bolliger & Mabillard has 85 operating roller coasters worldwide.[2] Of these, twenty-two were listed among that year's Amusement Today Golden Ticket Awards Top 50 Steel Coasters List for 2012 and five were in the top 10.

By 2016, Bolliger & Mabillard had completed their 100th coaster, and had built more roller coasters than any other manufacturer on the Golden Ticket Awards Steel Coasters list.[21]

Diagram comparing a standard lift hill and the B&M pre-drop lift hill.

Many Bolliger & Mabillard coasters feature an element known as a "pre-drop", a short drop after the top of the lift hill and before the start of the first drop, designed to reduce stress on the lift chain. The flat section between the pre-drop and the first drop serves as a shelf to support the weight of the train, reducing related stresses on the chain. On most coasters without a pre-drop, the weight of the train tends to pull on the lift chain as it begins its descent because the latter half of the train is still being lifted by the chain. Pre-drops have not been used on the company's Dive or Flying coasters, or on hyper coasters built after 1999.[26][27] OzIris at Parc Astérix was the first B&M inverted roller coaster that does not feature a pre-drop.[28] Ever since, no coaster built by B&M has featured a pre-drop[29][30] because the chain accelerates on newer coasters of B&M after the train passes the crest to acquire the same speed as the train when it is being taken over by gravity.[31]

Most of Bolliger & Mabillard's roller coaster trains use four-abreast seating. Each car has one row of four seats, while the train length can vary between coasters. All of the company's coaster models, except the Dive Coaster and Wing Coaster use this configuration. The Dive Coaster uses six, eight or ten-abreast seating, with two or three rows of seats. For example, Griffon at Busch Gardens Williamsburg, uses ten seats in three rows, while Krake at Heide Park uses six-across seating in three rows.[32] On recent hyper coaster projects, B&M has used a new car design that has two rows of two seats; the two seats in the rear of the car pushed out from the centerline so that the four seats resemble a V formation. This formation has only been used on Behemoth at Canada's Wonderland, Diamondback at Kings Island, Intimidator at Carowinds and Shambhala: Expedición al Himalaya at PortAventura Park, in the resort PortAventura World. In 2013, B&M introduced a new car design that has two rows of two seats, however, they are not in a V formation.[19][20]

All B&M hyper coasters use a type of restraint called a "T-bar" or "Clamshell" restraint, which consists of bar with a cushioned lap bar with two handles for riders to hold on to. This type of restraint generally does not use a seat belt, however seat belts have been added to Behemoth and Leviathan at Canada's Wonderland, Diamondback at Kings Island, and Intimidator at Carowinds, all of which have the stadium style seating.[33] Bolliger & Mabillard also uses over-the-shoulder restraints, in that the restraint is placed over the riders' shoulders and sits and extends to the riders' laps. This type of restraint is used on Dive, Inverted, Sitting, Flying, Floorless, Stand-up and Wing Coasters.[34] Bolliger & Mabillard has recently begun using a vest like over the shoulder restraint, which reduces headbanging found on the older, more common padded over the shoulder restraints. These have been met with some criticism from the coaster community, due to the nature in which they tighten during the ride; stapling riders to their seats, resulting in less airtime (negative g-forces) being felt.

CAD model of B&M's signature box-spined track

B&M Friction Brakes Model

A notable feature of Bolliger & Mabillard roller coasters is the box-section track. The running rails are connected to a box-section spine, instead of the circular spine used by other manufacturers. When a train travels around a box-section track, it creates a distinctive roaring sound, which is unique to this style of track. However, on some Bolliger & Mabillard roller coasters, such as Talon at Dorney Park & Wildwater Kingdom and GateKeeper at Cedar Point, the track is filled with a proprietary sound dampening material to reduce this noise.[35]

Also, depending on the model of the roller coaster, the track size can vary. Models such as the Flying, Wing and Dive Coaster have heavier trains which require a larger track size while models with lighter trains, such as the Stand-Up and Hyper Coaster, do not and use a smaller sized track.[4]

As of 2016, Bolliger & Mabillard uses three types of braking systems: friction, magnetic, and water.

When B&M was first founded, the linear magnetic eddy brake had yet to be developed, so it used friction brakes as its main braking system. On the train, pads are fitted beneath the seating areas. On the brakes, similar pads are connected to steel supports. When the pads on the train come into contact with the brakes, friction is created which slows the train.[36] Beginning with Kumba in 1993, friction brakes have also been used as trim brakes that regulate the speed of the train while it is still navigating the course.[37]

SheiKra's splashdown element

Magnetic brakes were first used on Nitro at Six Flags Great Adventure in 2001.[38] Magnetic brakes slow down trains much faster than friction brakes; most B&M roller coasters built in or after 2001 have at least one set of magnetic brakes. Magnetic brakes do not make contact with the train. Fins that run parallel to the train are fitted beneath the seats. As the fins pass through the brakes, the magnetic field created by the brakes slows the train. Magnetic brakes have also been used as an alternate type of trim brake on B&M roller coasters such as Leviathan at Canada's Wonderland.[39]

Water brakes were first introduced on SheiKra at Busch Gardens Tampa Bay in 2005.[40] Water brakes can only be used when a splashdown element, in which a body of water surrounds a section of track, is present within the layout of the roller coaster. When scoops on the last car of each train come in contact with the surrounding water, the train slows down and the water is sprayed several feet into the air behind it.[41]