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When (after launching the mothership) is the VSS Unity dropped from the mothership and at which altitude? I mean in space flights (above 80 km)

More or less, of course

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WhiteKnightTwo uneventfully carried SpaceShipTwo to a release altitude of approximately 47,000 feet MSL.

NTSB Accident Report - Virgin Galactic Party Submission

The flight in the report lifted off at 09:19:30 PDT and released SpaceShipTwo at 10:07:19.27 PDT.

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  • $\begingroup$ So at 48 min and 14 km.. Interesting, thanks. And how long it takes the whole flight? $\endgroup$ – Joe Jobs Dec 12 '20 at 16:03
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    $\begingroup$ Sounds like a new question. $\endgroup$ – Organic Marble Dec 12 '20 at 16:04
  • $\begingroup$ The link has broken, and I can't easily find a replacement. I found this accident report on the NTSB website, but it doesn't appear to be the document you quoted from. $\endgroup$ – Michael Seifert Dec 27 '20 at 14:34
  • $\begingroup$ @MichaelSeifert well, that's annoying! I used it for another answer as well. Thanks for letting me know, I fixed the link. It's a bit weird though - it's a pdf but they have it tagged as html. $\endgroup$ – Organic Marble Dec 27 '20 at 15:25
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Looks like there is a bit of variance in the altitude at which the VMS Eve mothership releases the VSS Unity spacecraft.

https://en.wikipedia.org/wiki/VSS_Unity_VP-03:

On 13 December 2018, at an altitude of 43,000 ft (13,000 m), the VMS Eve released the VSS Unity for its fourth powered test flight.

https://www.space.com/virgin-galactic-spaceshiptwo-launch-abort-spaceport-america:

Things went smoothly enough early on. Unity lifted off beneath the wings of VMS Eve, its WhiteKnightTwo carrier aircraft, around 10:24 a.m. EST (1524 GMT; 8:24 a.m. local New Mexico time [2020-12-12]). And Eve dropped Unity on schedule, at an altitude of about 50,000 feet (15,000 meters).

https://www.topgear.com/car-news/big-reads/behind-scenes-virgin-galactic (mirror):

WhiteKnight, the mothership, that will take Unity and its cargo of future astronauts to 14,600m before releasing her to cover the remaining distance on rocket power.

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