|Category||Formula Two, Formula One|
|Suspension (front)||Double wishbone|
|Suspension (rear)||Chapman struts|
|Engine||Coventry Climax FPF 1,475, 1,964 and 2,207 cc inline 4, gear-driven DOHC normally aspirated. front engined, longitudinally mounted.|
|Transmission||Ansdale-Mundy transaxle 5-speed, with ZF diff. in bespoke casing|
|Notable drivers||23x15px Graham Hill|
Colin Chapman's first foray into single-seater racing, the 12 appeared in 1957. It featured a number of important innovations Chapman would use on later models. To better use the power of the Coventry Climax engine, it was designed, as usual, for low weight and low drag, relying on a space frame. It placed the driver as low as possible, reducing the height of transmission tunnel by way of a "conceptually brilliant" five-speed sequential shift transaxle located in the back. This transaxle was designed by Richard Ansdale and Harry Mundy, which suffered from a (long-undiagnosed) problem of oil starvation, thus earned the nickname "Queer Box" for its poor reliability.
Although the first two examples of Lotus 12 had De Dion rear suspension, it also introduced a new suspension configuration with what came to be called "Chapman struts" in the rear, essentially a MacPherson strut with a fixed length halfshaft with universal joints on the ends utilised as a suspension arm.
|Problems playing this file? See media help.|
Lotus 12 was the first Lotus to be fitted with the iconic wobbly-web wheels. Reflecting Chapman's emphasis on engineering for lightness, these were cast in magnesium alloy, a kind of crimped cylinder, resulting in minimum material and maximum strength, without the weaknesses induced by slots in conventional designs.
Despite its engineering advances, the 12 was not a success in F1. In F2, the car won the class in the mixed F1/F2 1958 BRDC International Trophy, driven by Cliff Allison, but in spite of a small number of podiums, was usually drowned in a sea of Coopers.
- Lotus 12 Donington.jpg
Lotus 12 in the Donington Grand Prix Exhibition in 2007
- Lotus 12.jpg
Lotus 12, Chassis No. 353 in 2010
- Lotus 12 Chassis No 353 of 1958.JPG
Lotus 12, Chassis No. 353 in 2013
- Setright, L. J. K. Lotus: The golden mean, in Northey, Tom (ed.) World of Automobiles (London: Orbis, 1974), Volume 11, pp. 1221–34.
|Lotus production car timeline, 1950–present|
|Sports racer||Mark VIII||Mark IX||Eleven||15||17||19||23||30||40||47||62|
|Saloon||Ford Cortina Lotus||Ford Cortina Lotus|
|Grand tourer||Europa||Esprit||Europa S|