Heinkel HeS 1 - the first operational jet engine Heinkel HeS 3 - the first jet engine to fly Heinkel-Hirth HeS 30 - aka 006, perhaps the best early German design, cancelled for what turned out to be very bad reasons Heinkel-Hirth HeS 40 - "constant volume" combustion engine Heinkel-Hirth HeS 50 - ducted-fan unit for long-duration flight Heinkel-Hirth HeS 60 - HeS 50 with an additional turbine stage Heinkel-Hirth HeS 011 - advanced twin-spool design, only 19 test examples ever built