| HeS 40 | |
|---|---|
| Type | Constant Volume Gas turbine jet engine |
| National origin | Germany |
| Manufacturer | Heinkel-Hirth Motorenbau |
| Designer | Adoph Müller |
The Heinkel HeS 40 (HeS - Heinkel Strahltriebwerke) was an experimental constant-volume jet engine designed by Adoph Müller's team at Heinkel starting some time in 1940 or 41. It was based on the mechanical layout of the HeS 30, but replaced the conventional flame cans with oversized ones including large poppet valves that sealed off the chambers during firing. Constant-volume combustion, similar to the Otto cycle used in most piston engines, is considerably more fuel efficient than the constant-pressure combustion used in a typical jet engine.[1]