All Questions
Tagged with ullage apollo-program
2
questions
4
votes
1
answer
213
views
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 ...
- 141
9
votes
1
answer
702
views
Why did the S-IV-B refer to "jettison"ing its ullage?
This is based on a recent question about S-IV-B ullage motor shutoff timing, specifically something found in the Technical Information Summary AS-501, page 15:
Ullage Jettison ~ 532.
But why "...
- 91