1934 Chrysler Imperial Airflow

The radical Airflow was the first mass-produced automobile developed with the help of a wind-tunnel. When most cars' rear ends had better drag coefficients, the Airflow showcased an aerodynamic 'waterfall' grille, cab-forward design and unit body construction.

Too avant garde for traditional Americans, the Airflow in its original form, died a quick death. This Imperial version -- the zenana car of the Rajkot royal family -- has a more powerful 130 bhp 5400cc straight-eight, special trim and a longer wheelbase.

Photograph: Chrysler Web site

Also see: The world's first private airship