Hybrid ACES stage simplified;SEP engine shares geometry with IVF engine
In this scenario the noble gas SEP propellent is not used as Ullage/pressurent but has fuel lines directly to the ACES aft SEP engine.Cryogenic Neon would use a small tank if the ACES has ZBO.
Use the depleted O2 tank in the event of a overpressure event but then would need a kludge for that…..:)
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