The 911 traces its roots to sketches drawn by Ferdinand "Butzi" Porsche in 1959. The Porsche 911 was developed as a more powerful, larger and a more comfortable replacement for the Porsche 356, the company's first model. The new car made its public debut at the 1963. Frankfurt Motor Show (German: Internationale Automobil-Ausstellung). The car was developed with the proof-of-concept twin-fan Type 745 flat-six engine, but the car presented at the auto show had a non-operational mockup of the single-fan 901 engine, receiving a working unit in February 1964[
