Rational (McMullen)

Rational was a British automobile brand built by KJ McMullen in Brimpton (Berkshire) from 1910 to 1911 .

There were two different models, luxury touring cars of ordinary construction. Both models were equipped with single-cylinder engines from Fafnir with a displacement of 500 cc, which in one case were combined to form a V4 engine, in the other case a V6 engine.

source

• David Culshaw & Peter Horrobin: The Complete Catalog of British Cars 1895–1975 . Veloce Publishing plc. Dorchester (1997). ISBN 1-874105-93-6