A Floorless Coaster is a type of steel roller coaster manufactured by Bolliger & Mabillard where riders sit with no floor underneath them, allowing their feet to swing freely just above the track. Development of the Floorless Coaster model began between 1995 and 1996 with Medusa at Six Flags Great Adventure, which opened on April 2, 1999, as world's first Floorless Coaster. Floorless Coasters typically feature between three and seven inversions in the layout of the coaster.
Since 2007, Bolliger & Mabillard have used floorless trains on their Dive Coasters, such as Griffon and SheiKra. Though they contain floorless trains, the coasters are still not considered Floorless Coasters, as the company classifies them as another model. Maurer Söhne has designed their own version of the Floorless Coaster, a variant of their X-Car model called X-Car Floorless, but currently do not have any installations.
The design of a Floorless Coaster has one main difference from traditional steel roller coasters around the world: there is no floor under the seats.[3] While a train is parked in the station, a floor is used only for loading and unloading purposes. Because the front row has nothing in front of it to stop riders from walking over the edge of the station, a gate is placed in front of the train to prevent this from happening. Once all the over-the-shoulder restraints are locked, the floor separates into several pieces and retracts underneath the station. The gate then opens, allowing the train to move forward. When the train returns to the station, the floor is brought back up and the gate is closed for the next group of riders to load and unload.[4] Aside from the station, Floorless Coasters have similar layouts to B&M's sit-down coasters.[2][5]
Bolliger & Mabillard has built thirteen Floorless Coasters from the ground up, with three additional that were converted from stand-up roller coasters. The roller coasters are listed in order of opening dates.
Maurer Söhne, a German roller coaster and steel manufacturer, has developed their own version of the Floorless Coaster called the X-Car Floorless. The car is the same as the original X-Car with the only difference being that there is no floor during the ride.[24][25] As of 2019, no X-Car Floorless roller coasters have been manufactured.[24]
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