The Cooper Mark III is a
Formula Three open-wheel
An open-wheel single-seater (often known as formula car) is a car with the wheels outside the car's main body, and usually having only one seat. Open-wheel cars contrast with street cars, sports cars, stock cars, and touring cars, which have thei ...
racing car
Auto racing (also known as car racing, motor racing, or automobile racing) is a motorsport involving the racing of automobiles for competition.
Auto racing has existed since the invention of the automobile. Races of various sorts were organise ...
designed and developed by the
Cooper Car Company in
Surbiton
Surbiton is a suburban neighbourhood in South West London, within the Royal Borough of Kingston upon Thames (RBK). It is next to the River Thames, southwest of Charing Cross. Surbiton was in the historic county of Surrey and since 1965 it has ...
,
Surrey
Surrey () is a ceremonial and non-metropolitan county in South East England, bordering Greater London to the south west. Surrey has a large rural area, and several significant urban areas which form part of the Greater London Built-up Area. ...
,
England, and built in 1949. It was the successor to the
Mk.II, and was offered in two versions. The first option was the T7 (Type 7); which was powered by a powered by a
JA Prestwich Industries (JAP) 4B Speedway
single-cylinder OHV motorcycle engine. The second option was the T9 (Type 9); which featured a longer
chassis
A chassis (, ; plural ''chassis'' from French châssis ) is the load-bearing framework of an artificial object, which structurally supports the object in its construction and function. An example of a chassis is a vehicle frame, the underpart ...
, with an elongated
wheelbase, and used a larger and more powerful
JA Prestwich Industries (JAP)
V-twin motorcycle engine. For the first time ever, a
ZF limited slip differential was also offered as an optional extra for customers.
References
Cooper racing cars
Formula Three cars
1940s cars
Cars of England
{{Classicpow-auto-stub