Heinkel HeS 3
| HeS 3 | |
|---|---|
 |
|
| A sectioned Heinkel HeS 3 Turbojet engine at the Deutsches Museum | |
| Type | Centrifugal flow turbojet engine |
| National origin | Germany |
| Manufacturer | Heinkel-Hirth Motorenwerke |
| First run | 1938 |
| Developed from | Heinkel HeS 1 |
| Developed into | Heinkel HeS 6 |
The Heinkel HeS 3 (HeS - Heinkel Strahltriebwerke) was the world's first operational jet engine to power an aircraft. Designed by Hans von Ohain while working at Heinkel, the engine first flew as the primary power of the Heinkel He 178, piloted by Erich Warsitz on 27 August 1939. Although successful, the engine had too little thrust to be really useful, and work started on the more powerful Heinkel HeS 8 as their first production design.
The HeS 3 design was largely based on the HeS 1 but converted to burn liquid fuel instead of hydrogen gas used in the HeS1. The first HeS 3 design was generally similar to the HeS 1, using an 8-blade inducer and 16-blade centrifugal compressor. The compressed air flowed into an annular combustion chamber between the compressor and turbine, which made the engine longer. The first example was bench tested around March 1938, but did not reach the design thrust because a small compressor and combustor had been used to reduce the frontal area.
An improved engine, the HeS 3b, had a 14-blade inducer and 16 blade centrifugal compressor. In order to minimise the diameter the widest part of the annular combustor was placed in line with the smaller diameter axial entry to the impeller. At exit from the impeller the air flowed forwards, then turned through 180 degrees to flow rearward through the combustor. The flow was then turned radially inwards to enter the turbine. Although not as compact as the original design, the 3b was much simpler. The fuel was used to cool rear roller bearing, which also preheated the fuel.
The engine was completed in early 1939, and was flight-tested under one of the remaining Heinkel He 118 dive bomber prototypes. The flight tests were carried out in extreme secrecy, taking off and landing under propeller power, and only flying in the early morning before other workers had arrived. Testing proceeded smoothly, but the engine eventually burned out its turbine.
A second engine was completed just after completion of the He 178 airframe, so it was decided to move directly to full flight tests. A short hop was made on 24 August during high-speed taxi tests, followed by full flight on 27 August, the first aircraft to fly solely under jet power. Testing continued and in November the aircraft was demonstrated to RLM officials in hopes of receiving funding for the development of a larger engine, but nothing seemed forthcoming.
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