![]() ![]() No need to develop autonomous flyback then like SpaceX. If they decide to do MAR for the whole booster, perhaps the stage could flip and do a burn to reduce speed to reduce the thermal stresses on it during reentry, and then pop a parafoil with drogue and have a copter snag the whole thing, and then drop it down on the deck of a barge. Now that would be an interesting development. ![]() But if they are building a new stage anyway, why not incorporate it into it? As the engine is most of the weight of the booster, I would think recovering the whole booster stage that way would be within the performance limits of a helicopter than could handle the engine alone. They took a long look at it for Atlas, but it would require a big redesign of the Atlas booster. Atlas dropped 2/3 of it's engine during ascent up until the switch to RD-180 on Atlas III. And a jettisonable engine is no real issue, if they stick with the concept of the paper. Stage Mid Air Recovery Technique/Technology.maybe? A single helicopter and barge/ship located downrange are all that's needed to do it. So the "S" and "T" are probably some sort of descriptors for MAR. Not sure what the "S" and "T" are for, but I bet the "MAR" is: Mid- Air Recovery In that paper it's referred to as "MAR" several times, and sometimes as "3GMAR" for "3rd Generation Mid Air Recovery".
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