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FIRST STEPS TOWARD SPACE - Smithsonian Institution Libraries

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98 SMITHSONIAN ANNALS OF FLIGHT<br />

Total<br />

Section along EF<br />

Section<br />

along CD<br />

Wrapped in tin & soldered all around<br />

View along arrow A<br />

To manometer<br />

Oxidizer<br />

FIGURE 10.—The ORM-52 engine was designed in 1933 and passed static acceptance tests in<br />

that year. Designated for experimental rockets and naval torpedoes, it used nitric acid and<br />

kerosene as propellants. Engine data were as follows: Thrust at ground level 250-310 kg;<br />

specific thrust 210 sec; chamber pressure 20-25 atm; excess oxidant ratio 1.08; fuel feed pressure<br />

40 atm; ignition, hypergolic; combustion chamber volume 2.25 1; engine weight 14.5 kg.

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