3. Chrysler Airflow (1934)
The 1934 Chrysler Airflow introduced aerodynamics to automotive design, setting trends that appeared in later decades even as its sales failed to impress. Its streamlined shape and unibody construction reduced drag and improved stability, influencing future vehicle designs. Despite its innovative features, the Airflow’s unconventional appearance and manufacturing challenges led to poor sales, yet its impact on automotive engineering is undeniable. [Source: Smithsonian Magazine]