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Tagged with ullage propulsion
2
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Why does the Vulcan-Centaur upper stage do ullage burns after engine shutdown?
During the livestream of the recent Vulcan-Centaur launch, the animation of the upper stage shows what appear to be extensive ullage burns (at least four minutes, at least three minutes, and at least ...
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votes
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Why did Apollo missions open the propulsive Hydrogen vents during the coast phase?
According to Figure 2-1 of the SA-503 flight manual the LH2 continuous vent was opened during the coast phase, and closed during the ullage stage of the S-IVB restart T_6 + 0:00:42.0 (but open for ...
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