Bluebird-Proteus CN7 land speed record vehicle preserved at the National Motor Museum in Beaulieu, UK.
The Bluebird-Proteus was conceived by British record breaker Donald Campbell and designed by British engineering brothers Ken and Lew Norris, with technical backing from British industry. Construction was completed in 1960. Power was provided by a modified Bristol-Siddeley Proteus turboshaft engine of 4,450 shp driving all four wheels (at that time the land speed record rules only allowed wheel-driven vehicles).
Campbell made a few attempts on the record, the first at Bonneville, US in 1960 during which he was badly injured in a crash, and a second attempt in 1963 in the rebuilt CN7 at Lake Ayre, Australia which was unsuccessful due to bad weather. In 1964 another attempt was made at Lake Ayre where Campbell managed to set a new world land speed record of 403 mph. This was an increase over the previous record of only 9 mph which was a disappointment to Campbell as the CN7 had been designed for 500 mph, however ground conditions were not ideal. The official record speed was derived from the average speed of two opposing runs measured over a timed 1 mile section of a 15 mile course. The peak speed of the CN7 as it left the measured mile on one of the runs was recorded as 440 mph.
The official record speed of 403 mph remains the fastest speed set by a purely wheel-driven vehicle, as all subsequent land speed records have been made in rocket or turbojet/turbofan powered vehicles.
Campbell lost his life in January 1967 whilst attempting to raise his own water speed record in the Bluebird K7 on Lake Coniston, UK.