Superleggera

Not to be confused with Space frame.
For the motorcycle, see Ducati 1199.
Superleggera emblem on an Aston Martin DB5, with a body manufactured by Carrozzeria Touring, the firm that originated the superleggera system.

Superleggera (translation: "super light") is an automobile coachwork construction technology developed by Felice Bianchi Anderloni of Italian coachbuilder Carrozzeria Touring Superleggera. The company was located just north of Milan, near Alfa Romeo, Italian Citroën, and the former Isotta Fraschini plant. The first superleggera bodyworks were made for these companies.

Touring licensed Charles Weymann's system of fabric-covered lightweight frames, which led to Touring’s own superleggera construction.[1] Patented by Carrozzeria Touring in 1936, the superleggera system consists of a structural framework of small-diameter steel tubes that conform to an automobile body's shape and are covered by thin alloy body panels that strengthen the framework. Aside from light weight, the superleggera construction system allows great design and manufacturing flexibility, enabling coachbuilders to quickly construct innovative body shapes. The superleggera tubes were brazed to shape on a jig and the panels were then fitted over this. The panels are only attached at their edges, mostly by swaging the panel edges over angle-section strips on the steel framework. Most of the panel has no rigid or metal-to-metal contact with the framework, it merely rests on it, with the tubes wrapped in hessian or with a rubber spacer.[2]

The superleggera system was primarily based on the use of 'Duralumin', a material that originated in the Zeppelin industry prior to World War I. In England after World War II, the alloy Birmabright was used, as it was stiffer in thin sheets and more widely available.

The superleggera system is no longer used in high-volume automobile production for a number of reasons. Primarily, a superleggera body cannot meet modern impact resistance standards, and the cost of manufacture and galvanic corrosion between the aluminum body panels and the steel tubular frame are also prohibitive factors. Additionally, the frame tubes used to construct a superleggera body are too small and of unsuitable material for mounting suspension components, so a chassis is required, a disadvantage not found in spaceframe and other chassis systems. Car makers such as Bristol, which had aircraft industry experience, were more successful in countering galvanic corrosion than other manufacturers.[3][4] Bristol introduced Superleggera construction on the Bristol 401 of 1948.[2]

Superleggera is a trademark owned by Carrozzeria Touring Superleggera s.r.l., the modern incarnation of the firm that patented the system in 1936.

Notable automobiles

Carrozzeria Touring licensed the superleggera construction system to Aston Martin, who designed and manufactured superleggera bodywork for the DB4 and DB5.[5][6] Several other manufacturers created automobiles using Carozzeria Touring's superleggera construction technology. Notable examples include:

See also

References

  1. ↑ "Touring Superleggera". lifeinitaly.com. Retrieved 2011-09-05.
  2. 1 2 Laurence Pomeroy; Rodney Walkerley, eds. (1949). Cars of the Year: Bristol. The Motor Yearbook. Temple Press.
  3. ↑ "Semi-permanent protectives". Corrosion. Ministry of Aviation. September 1966. pp. 17–19. AP.119A-0201-1.
  4. ↑ Setright, L.J.K. (1974). Bristol Cars and Engines. Motor Racing Publications. ISBN 0-900549-22-X.
  5. ↑ "1963 Aston Martin DB4 Series IV Vantage: $352,000". theastonmartinreview.blogspot.com. Retrieved 2011-09-05.
  6. ↑ "1970 Aston Martin DB6 Mark 2 Vantage". classic-auctions.com. Retrieved 2011-09-05.
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