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The Helen rocket stages float on the sea. Why did they not sink?

April 26, 2017Float helen rocket sea sink stages

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The Helen rocket stages float on the sea. Why did they not sink?

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Helen is using a pressure fed system, so the fuel tanks were fueled with only half of the total capacity. The rest of the tanks were left empty. The fuel was transferred from the Venus ship, from the blue spherical tanks to the rocket stages.