Lotus 12

Racing car
Car_name = Lotus 12


Category = Formula Two
Constructor = Lotus
Designer = Colin Chapman
Team =
Drivers = flagicon|UK
Chassis = Steel spaceframe
Front suspension =
Rear suspension = Chapman struts
Engine name = Coventry Climax
Capacity = 1100cc
Configuration = V8,
Turbo/NA = normally aspirated.
Engine position = front engined, longitudinally mounted.
Gearbox name = Ansdale-Mundy indirect
Gears = 5-speed
Type = manual.
Differential =
Fuel =
Tyres =
Debut = 1957
Races =
Wins =
Cons_champ =
Drivers_champ =
Poles =
Fastest_laps =
The Lotus 12 was an unsuccessful Formula Two racing car.

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 space frame. It placed the driver as low as possible, eliminating the transmission tunnel by way of a "conceptually brilliant" [Setright, L.J.K, "Lotus: The golden mean", in Northey, Tom, ed. World of Automobiles (London: Orbis, 1974), Volume 11, p.1225.] five-speed indirect gearbox designed by Richard Ansdale and Harry Mundy, which suffered from a (long-undiagnosed) problem of slinging oil away from its gears. [Setright, p.1225.] It also introduced a rear suspension with what came to be called "Chapman struts", essentially a MacPherson strut with universal joints as suspension pieces. [Setright, p.1225-6.] (This was well suited to a monocoque body, and may have inspired Chapman, always obsessed with reducing weight, to try it.) [Setright, p.1226.]

Reflecting Chapman's emphasis on engineering, the 12 also used magnesium wheels of unique pattern, a kind of crimped cylinder, resulting in minimum material and maximum strength, without the weaknesses induce by slots in conventional rims. [Setright, p.1225.]

Despite its engineering advances, the 12 was not a success.

Notes

ources

*Setright, L.J.K. "Lotus: The golden mean", in Northey, Tom, ed. World of Automobiles (London: Orbis, 1974), Volume 11, p.1221-34.