[AR] Re: Blue Origin
- From: Chris Jones <clj@xxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Tue, 24 Nov 2015 20:14:57 -0500
On 11/24/2015 7:35 PM, Daniel Rocha wrote:
Hi People, what is the usual horizontal speed, and its altitude, of
the 1st stage of space X when it is released by the rocket?
http://www.spaceflight101.net/video-shows-eventful-seconds-leading-to-falcon-9-booster-crash-landing.html
is an article describing one of the landing attempts. It contains the
following tidbits: "the 43-meter long first stage started out on its
journey immediately after stage separation – firing its thrusters to
maneuver out of the exhaust of the second stage and re-orient to an
engines-forward posture for the first of three propulsive maneuvers –
starting out at an altitude of close to 80 Kilometers and a speed of
over 2 Kilometers per second at separation" & "the booster successfully
ignited three of its Merlin 1D engines at around T+4 minutes & 30
seconds – each delivering up to 66,700 Kilogram-force of thrust. This
retrograde boost-back burn aimed to reduce the downrange travel distance
of the first stage by about 50%, compared with a fully ballistic path
not including any maneuvers after separation. The boost back burn also
modified the exospheric trajectory of the stage, pushing the apogee
below 125 Kilometers. (That comment probably contradicts my guess that
the first stage did not reach 100 km.)
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