Published at Wednesday, September 28th, 2016 - 14:21:13 PM. Door. By john.
Butterfly doors : Butterfly doors or vertical doors are a type of door sometimes seen on high-performance cars. They are similar to scissor doors. While scissor doors move straight up via hinge points at the bottom of the A-pillar, butterfly doors move up and out via hinges along the A-pillar. This makes for easier entry/exit at the expense of requiring more opening space than needed for scissor doors. The McLaren F1, Alfa Romeo 33 Stradale, Saleen S7, Enzo Ferrari and its non road-going version, the FXX, Toyota Sera/EXY-10, and the Mercedes-Benz SLR McLaren, among others, use butterfly doors. It was also a common feature for Group C and IMSA GTP/Camel Lights prototype racers as they incorporate teardrop tops which allows the driver to get in and out of the car more quickly than conventional and gullwing doors, especially in a cramped pitlane environment such as the pre-1991 Le Mans circuit. Since then, butterfly doors have been an adopted design of closed top sportscar racers, such as the Toyota GT-One, Bentley Speed 8 and more recently, the Peugeot 908 HDi FAP. The Toyota Sera, made between 1990 and 1995, was a limited-release car designed exclusively for the Japanese market which used this design. The Mercedes-Benz SLR McLaren Roadster was one of the few open top cars to use butterfly wing doors. This is made possible by having the doors hinged at the side of A-pillar instead of at top by the roof. The McLaren MP4-12C has a unique system where the butterfly doors do not use a top hinge meaning that the car can use frameless windows which allows for the cars convertible version to retain them.
Dutch door : A Dutch door (American English), stable door (British English), or half door (Hiberno English), is a door divided horizontally in such a fashion that the bottom half may remain shut while the top half opens. They were known in early New England as a double-hung door. The initial purpose of this door design was to keep animals out of farmhouses or to keep children inside while allowing light and air to filter through the open top; essentially combining a door with a fairly large window. When the top half was open they also allowed a breeze, but stopped the wind from blowing dirt into the house. This type of door was common in the Netherlands in the seventeenth century and appears in Dutch paintings of the period. They were also commonly found in the Dutch cultural areas of New York and New Jersey before the American Revolution. Dutch doors are often used in North-American passenger train cars to allow crewmen to interact safely with other employees not aboard their trains (or simply to visually inspect their own train) without risking falling from the train. Recent operating rules changes in Canada have rendered the Dutch-doors obsolete, although older rolling stock retains the doors. Similar doors were once commonplace in Irish houses, called half-doors (Irish: leathdoras or comhla bheag). According to The Irish Times, A traditional half-door is really a door and a half – a full door that opens inwards and a half door set to the front of the frame that opens outwards. They were designed to keep poultry and pigs from entering the house, as well as allowing air and sunlight into the usually dark and smoky cottages. The term is also applied to the modified rear doors on selected GMC Safaris and Chevrolet Astros that have a flip up rear window and two small half-size doors underneath.
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