[AR] Re: SpaceX F9 Launch/Update -- Live Link

  • From: Robert Steinke <robert.steinke@xxxxxxxxx>
  • To: arocket@xxxxxxxxxxxxx
  • Date: Wed, 23 Dec 2015 11:02:21 -0700

On Wed, Dec 23, 2015 at 9:47 AM, David McMillan <skyefire@xxxxxxxxxxxx>
wrote:





After 2nd MECO (BBECO? We're going to need new terminology, aren't
we?), even though the lateral velocity was now westerly, the booster kept
climbing to a maximum altitude of nearly 180km AGL (vertical coasting from
the initial boost phase, or did the boostback burn add altitude for some
reason?).


An optimal boostback burn usually adds some upward velocity. That gives
more time for the return trip and so requires less horizontal velocity. As
usual, things optimize with some of each.

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