General Motors Rotary Combustion Engine

The General Motors Rotary Combustion Engine (GMRCE) is an internal combustion Wankel engine which uses a rotary design to convert pressure into a rotating motion instead of using reciprocating pistons. In November 1970, GM paid $50 million ($414,524,422 in 2025 dollars) for initial licenses to produce their version of the Wankel rotary engine, and GM President Ed Cole initially projected its release in three years.

Source: Wikipedia — General Motors Rotary Combustion Engine (CC BY-SA 4.0)