Gullwing Doors


 



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Gullwing doors also known as Deloren Doors or Gull wing doors not - Lambo Doors Gull-wing doors

 


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What are Gullwing Doors?

The term gull-wing door is an automotive term describing car doors which are hinged at the roof. They are named because, when opened, the doors evoke the image of a seagull's wings.


The most well-known examples of road cars with gull-wing doors are the Mercedes-Benz 300SL from the 1950s, the Bricklin SV-1 from the 1970s and the De Lorean DMC-12 from the 1980 (the famous back to the future car).

Are Gullwing Doors coming back? Yes - 2010!

Like everything retro, gull wing doors are making a subtle come back. Conventional car doors are typically hinged at the front-facing edge of the door and allow the door to swing outward from the body of the car. High end sport cars are now incorporating gullwing doors in order to stand out from the crowd. The Mercedes Benz SLC will have gullwing doors





Our Gull-wing Door conversion kit:

Our low cost gull wing door conversion kit shows you how you can add gull wing doors to any car.



The struts we use to support the doors are around 140 pounds and we use backdoor van hinges for the hinge. We normally used solid steel 3 inch Stanly door hingers To make opening of the gull-wing door easier, we suggest that you gut out some of the metal from the car door that will be used as the gull wing door.




The Gull wing door hinge

The hinge that we use looks like this:



They are off a Bedford van.



Practical Considerations


Despite the common misconception that the gull-wing doors are mere stylistic affectations, the design is a very practical one. The advantage is that when properly designed and counterbalanced (for example, the De Lorean), they require little side-clearance to open (about 27.5 cm, or 11" in the De Lorean) and allow much better entrance/egress than conventional doors. This is especially important for vehicles like the De Lorean whose width would make conventional doors awkward to use when the car


Gull-wing doors have a somewhat questionable reputation because of early examples like the Mercedes and the Bricklin. The 300 SL used the door design to allow an unusual chassis design which required a very high door sill and forced the doors to be smaller than would otherwise have been optimal. The Bricklin was a more conventional sized door but the actuation system was problematic in day-to-day use and led to unreliable operation. In addition, there was some concern that in making the door as light as possible, it couldn't provide adequate protection in side-impact accidents. There was, however, no indication that this concern was justified.

The De Lorean solved these problems by using a solid-steel torsion bar (supplied by Grumman Aircraft Engineering Corporation) to counterbalance a full-sized door and then used simple pneumatic struts similar to those found in hatchback cars to open the doors and dampen the movement of the doors.

Other disadvantages of the system were not so easy to address. For example, the gull-wing design makes creating a convertible version of the car virtually impossible since, for optimal efficiency, the hinges must be placed as close to the center of the car as possible. This was never a concern for the De Lorean since no convertible version was ever planned (though there were rumors of a four-door family car based on a front-engine chassis with room for four passengers).

It also makes sealing the car against water leaks more difficult because of the shape and movement path of the door itself. Many De Lorean owners report leakage when taking their vehicles through automated car-washes because of the high-pressure water jets, though in ordinary rainfall the seals were more than adequate.

In addition to the traditional gull-wing doors, there are other unusual door mechanisms - particularly among exotic and expensive cars. Lamborghini uses a design which is a hybrid of the conventional and gull-wing design which is generally referred to as a "scissor", "jack-knife" in which the door is still hinged at the front but swings upward from the car while staying parallel with the edge.

The McLaren F1 roadcar and Mercedes-Benz SLR use a variant of this system called Butterfly doors. The doors are hinged at the front similar the scissor doors but the hinges are placed higher up on the A-pillar, allowing the door to pivot both up and out. This increases the ability of the door to move out of the way of the car's occupants but does not prevent a convertible version. The Toyota Sera was a limited-release car designed exclusively for the Japanese market which used this design. Due to its unusual design, some enthusiasts in Australia, New Zealand and England have privately imported the cars. It is available only in right-hand drive configuration.

Koenigsegg uses a "dihedral synchro-helix" system for their vehicles which seems to combine the advantages of all the designs, though with considerably more mechanical complexity.

The BMW Z1 used a novel design in which its doors were not hinged at all but rather retracted vertically into the chassis, leaving an empty (though unusually high) sill.

The kit car Nova/Sterling also known as Purvis Eureka in Australia used a special type of door, actually a lifting canopy, on several of their models where the entire top section of the car was opened. The Saab Aero-X used a similar design.


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Gullwing doors, gull wing doors


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