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Haynes Roadster is a replica of Lotus Seven home-built according to a book ''Build Your Own Sports Car: On a Budget'' by Chris Gibbs (ISBN 1-84425-391-0). Ford Sierra is used in the car as a donor for drivetrain and suspension components. Haynes Roadster is a follow-up to the Locost design described in a book by Ron Champion. Locost uses Ford Escort Mark II as a donor, but as these have become increasingly rare, a design based on a more affordable Ford Sierra has been proposed. In contrast to Locost, which used Escort's solid axle at the rear, Haynes Roadster has independent, double wishbone, front and rear suspension. == Technical details == The main part of the car is a space frame chassis, which can be home-built according to the drawings and instructions in the book from rectangular 25x25 mm and 19x19 mm mild steel tubes. Several suppliers offer pre-built chassis. Flat pack kits, or sets of tubes cut to size and ready for assembly, are also available. Since the cars are hand built, and often the book design is modified to some extent, each chassis is unique, but as a rough guide, it weighs around 70 kg. The suspension wishbones are fabricated out of cold drawn seamless mild steel tubes. Sierra front uprights are used with some modification. At the rear fabricated uprights support Sierra rear hubs. Coilover dampers used for the design are available at specialist suppliers. The drivetrain usually consists of a Ford Pinto, CVH, or Zetec engine mated to a Sierra gearbox, a shortened or custom made propeller shaft, Sierra differential and driveshafts. The book design is based for the Type 9 gearbox, but the list of chassis modifications in order to fit the bigger MT75 transmission is provided on the Haynes forum. The braking system is taken directly from Ford Sierra, with the exception of vacuum servo, which is not required for the lightweight car. The steering system is usually composed out of a lengthened Ford Sierra steering column and a Ford Escort MkII steering rack. The bodywork is a combination of GRP parts and sheet aluminium panels. Alternate donors can be used by adapting the design of the front and rear suspension, a common alternative is the BMW E30/E36(an increasingly utilised kitcar donor as in the GKD Legend) and the Mazda MX5. Other manufacturers engine and gearbox's are also popular such as the Vauxhall XE. The modern prevalence of Front-wheel drive layout makes the choice of suitable engine/gearbox donors quite limited. As the supply of Ford Sierra donors in the UK is waning, the use of Mazda MX-5 is becoming more widespread, with the modifications to the chassis and suspension necessary in order to accept MX-5 components being independently published by the members of the community. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Haynes Roadster」の詳細全文を読む スポンサード リンク
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