Fix and improve Saturn V LVDC direct ascent capability#1614
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indy91 wants to merge 1 commit intoorbiternassp:Orbiter2016from
Open
Fix and improve Saturn V LVDC direct ascent capability#1614indy91 wants to merge 1 commit intoorbiternassp:Orbiter2016from
indy91 wants to merge 1 commit intoorbiternassp:Orbiter2016from
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maxq519
approved these changes
Mar 27, 2026
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Our Saturn V always had a limited direct ascent capability, but this PR fixes and improves it. It is enabled by setting the TerminalConditions flag to 0 and the DirectAscent flag to 1. How it works:
-The first opportunity TLI data tables are used to calculate the insertion targets
-At S-IVB cutoff the LVDC logic goes directly from Timebase 4 to Timebase 7
Attached is a modified Apollo 11 scenario targeting a direct ascent to lunar flyby. The presettings in the scenario are not perfect, so a moderately large midcourse correction is still required to get onto a lunar flyby trajectory.
Apollo 11 - July 21st Direct Ascent - Launch 0001.scn.txt