Heat engine
Helicotoroidal vane rotary engine
High compression rotary engine
High Efficiency rotary piston combustion engine
High efficiency tri-rotor ballistic engine
High speed rotary engine and ignition system
High-output robust rotary engine with a symmetrical drive...
High-power rotary engine with varaiable compression ratio
Hinge valved rotary engine with separate compression and expansi
Hinged rotor internal combustion engine
Homogenous charge compression ignition and barrel engines
Hot wall combustion insert for a rotary vane pumping machine
Housing wheel engine
Hybrid cycle rotary engine
Hybrid rotary engine