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In the first 4 modules can he still turned to another technology and fully filled the<br />
oxidizer and the pressure generated by a pressure line from the fuel tank. Later they came<br />
back to the conventional solution, because the overhead the advantage of a slightly better<br />
weight balance (you could fill the tanks full of something) justified.<br />
Characteristic Standard Metric<br />
Segment length of a tank 9.8 ft 3 m<br />
Diameter of a tank segment 10.63 in 0.27 m<br />
Mass of tank segment 22 lbs 10 kg<br />
Mass of a connector 4.4 lbs 2 kg<br />
Tank volume 6 cuft 171 l<br />
Nitric acid at 66% full load 384 lbs 174 kg<br />
HDA load at 66% filling 414 lbs 188 kg<br />
Load diesel at 66% fill 203 lbs 92 kg<br />
Tank pressure (ignition) 580 PSI 40 Bar<br />
Tank pressure (firing) 218 PSI 15 Bar<br />
The engine<br />
Each engine is like the tank 27 cm wide and 1 m long. Of this, 60 cm to the combustion<br />
chamber and nozzle, and the rest of valves and injection block. The engine is solid, does<br />
not swivel. It is not actively cooled, but used a ablative cooling resin and asbestos. The<br />
only moving parts are the valves which regulate the fuel flow. The ball valves are from<br />
Argus in the chemical industry and are driven by DC electric motors in the automotive<br />
industry. (First it was 50 watts Bosch motors for windshield wipers, but they were not<br />
powerful enough, so the third launch failed in a push system, so you went to 100-120<br />
watt motors). Particularly difficult was the development of the radial injection of fuel.<br />
Each engine has an average thrust of 25 kN. However, this can be varied over a wide<br />
area, and decreases during the combustion.
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