Fleming had also begun to write the children's book "Chitty-Chitty-Bang-Bang". The car itself was based on a composite of two cars: Fleming's own Standard Tourer, which he had driven in Switzerland in the late 1920s, and Chitty Bang Bang, a chain-driven customised Mercedes with a 23-litre 6-cylinder Maybach aero-engine. Fleming had seen the car's owner, Count Louis Zborowski race at the Brooklands race track. The origin of the name "Chitty Bang Bang" is disputed, but may also have been inspired by early aeronautical engineer Letitia Chitty. Like Zborowski, Fleming names his car because of the noise it made—and the noise a car made was important to Fleming.