Rational motorcar history (McMullen)
Brimpton (Berkshire) UK 1910-1911.
Rational was a British automobile brand that was built by KJ McMullen in Brimpton (Berkshire) between 1910-1911.
There were two different models, luxury touring car and ordinary construction. Both models were equipped with single cylinder engines from Fafnir with 500 cc displacement, which were assembled in a case to a V4 engine, in the other case was a V6 engine.