LiquidPiston, Inc. (LPI) is a company that develops propulsion and power generation solutions. It specializes in rotary engines with features such as liquid cooling, heavy-fuel and multi-fuel compatibility, and optimization for hybrid-electric applications. The company also offers testing, engineering, modeling, CNC machining and assembly, and other services. LiquidPiston serves the aerospace, industrial, commercial, marine, UAV, urban mobility, and automotive sectors.