In 2002, ATS constructed our first HiPerTEC prototype. The design was a 1.6 Liter (displacement volume), two-stroke engine with piston-controlled porting. The engine was dubbed the “8-2 Prototype” because of its eight-inch seam (major torus diameter) and a two-inch piston (minor torus diameter). The engine weighed less than thirty pounds and was only about eleven inches wide. 

In 2003, ATS began development on our second prototype, the 10-2.5, under funding provided by the Office of Naval Research (ONR). The prototype has a two-liter displacement volume and weighs approximately fifty pounds. In addition to being slightly larger than our first prototype, the intake and exhaust systems are also now controlled using independent pneumatically driven valves in each combustion chamber. This, combined with the ATS-developed control system, allows the engine to operate in two or four-stroke mode and to be switched between the two modes while running.