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<strong>OTRAG</strong> injection head in the first phase of the project until 1972, there were already 200<br />
firing tests with 3 failures. By the end of the support by the BMFT, in 1974 there were<br />
2,000 tests and now it will be 6000, with an accumulated operating time of 1 million<br />
seconds. I have received from Lutz Kayser no slice of the engine, fearing that someone<br />
might steal his intellectual property. The pictures here show, therefore, only the<br />
schematic operation.<br />
Each engine has an overhead line from the oxidizer and fuel tank. Unlike other engines,<br />
the fuel injection is not a head above the engine but is injected radially from the outside.<br />
Lutz Kayser points this out as one of 31 developments that worked only after long time<br />
and some setbacks. The injection is performed by 3 rings with 144 holes, which should<br />
allow a particularly good combination. The radial approach prevents the fuel reaches the<br />
combustion chamber wall, and thus cut off the reaction. The result is a very high<br />
combustion efficiency. The nozzle throat is a simple graphite ring. Due to its opening, the<br />
thrust will be regulated in a very wide range. The engine is so varied in a wide range of 5-<br />
50 kN. An aperture of 80 mm was used in the tests with 6 or 12 m long modules. This
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