ERA R4D

ERA R4D, built by English Racing Automobiles, is the last development of this classic voiturette racing car, the only D-Type ever built. Originating as R4B in 1935, the car was rebuilt as a C-Type by modifying the front end of the chassis frame to accommodate independent Porsche-type torsion bar front suspension. Over the winter of 1937-38 the car was given a completely new fully boxed frame, and was designated R4D.

As the first ERA to be fitted with a Zoller supercharger (in 1935), R4D accumulated a formidable competition record in its various guises, finally being purchased from the works by Raymond Mays, one of ERA's founders, and running as a privately entered car in 1939. Mays set numerous pre-war records in R4D, including Prescott and Shelsley Walsh hill climbs, Brighton Sprints and Brooklands Mountain Circuit. Mays describes his history with the car in his book Split Seconds.

After World War II R4D continued in active competition, but the demands on Mays's time created by the evolving BRM project meant he competed less frequently. In 1952 Mays sold R4D to Ron Flockhart. In 1953 Flockhart had a phenomenally successful season, winning the Bo'ness hill climb in a record setting 33.82 seconds. The car was featured on the cover of Autosport magazine. This success led to his joining the BRM team as a works driver, and later successes at Le Mans and elsewhere.

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