It was briefly directed towards automobile engines as part of the Tucker Car Corporation, returning to aviation when that company failed.

During World War II Air-cooled Motors was very successful producing helicopter and airplane engines.

Several aircraft carried its engines, including the Aero-Flight Streak, Bartlett Zephyr, Bell 47, Bellanca Cruisair, Brantly B-1, Goodyear Duck, H-23 Raven, Hiller 360, Piper J-3F Cub, Seibel S-4, Sikorsky S-52, Stinson Voyager, Taylorcraft 15, Temco TE-1B, and the YT-35 Buckaroo.

The innovations include modifications to the type certificate of the 6A-350; the approval for MOGAS, as well as fuel injection is pending at EASA.

[5] In addition, there are a number of restoration and service options for "legacy" or rather original US built Franklin engines.