Author Topic: Atlas V 401 - Cygnus CRS OA-7 - April 18, 2017 - Launch  (Read 69613 times)

Online ZachS09

T-2 minutes. The Atlas V is now on internal power; the CCB and Centaur have been disconnected from their external power sources.

The CMD sequence has started as the Centaur tanks have been topped off.
"Liftoff of Falcon 9: the world's first reflight of an orbital class rocket."

Offline Steven Pietrobon

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Re: Atlas V 401 - Cygnus CRS OA-7 - NET April 18 2017 - Launch
« Reply #401 on: 04/18/2017 03:10 PM »
T-2 minutes. Vehicle internal.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Online ZachS09

T-90 seconds. The Launch Control System has been enabled. From this point on, the Atlas V is isolated from all ground support equipment.
"Liftoff of Falcon 9: the world's first reflight of an orbital class rocket."


Offline centaurinasa

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Re: Atlas V 401 - Cygnus CRS OA-7 - NET April 18 2017 - Launch
« Reply #404 on: 04/18/2017 03:10 PM »

Online ZachS09

T-1 minute, 10 seconds. The Sound Suppression Water System has been armed for activation at T-4 seconds.

FTS has just been armed.
"Liftoff of Falcon 9: the world's first reflight of an orbital class rocket."

Online ZachS09

T-60 seconds. Now in the final minute of the countdown. The Range Operations Controller has given his GO for launch.

Main engine start will be commanded at T-3.8 seconds. Following a short health check, the umbilicals and holddown posts will be released, committing the Atlas V to flight.
"Liftoff of Falcon 9: the world's first reflight of an orbital class rocket."

Online ZachS09

T-30 seconds. Launch verification of the CCB, Centaur, and Cygnus in work.
"Liftoff of Falcon 9: the world's first reflight of an orbital class rocket."

Online ZachS09

T-20 seconds. Launch verification complete.

Good Lord, ride all the way. Godspeed, John Glenn.
"Liftoff of Falcon 9: the world's first reflight of an orbital class rocket."

Online ZachS09

T-10, 9, 8, 7, 6, 5, 4, engine start, 1, and we have liftoff of the S.S. John Glenn Cygnus spacecraft to the International Space Station. The clock is operating and we're underway.
"Liftoff of Falcon 9: the world's first reflight of an orbital class rocket."

Offline Steven Pietrobon

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Re: Atlas V 401 - Cygnus CRS OA-7 - NET April 18 2017 - Launch
« Reply #410 on: 04/18/2017 03:12 PM »
T-1 minute. Range green.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Online ZachS09

T+17 seconds. You're now listening to Marty Malinowski providing launch vehicle ascent data.

Atlas PU is in closed-loop control. Pitch and yaw programs in work.
"Liftoff of Falcon 9: the world's first reflight of an orbital class rocket."

Offline Steven Pietrobon

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Re: Atlas V 401 - Cygnus CRS OA-7 - NET April 18 2017 - Launch
« Reply #412 on: 04/18/2017 03:12 PM »
Liftoff!
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Online ZachS09

T+40 seconds. RD-180 performance is nominal.
"Liftoff of Falcon 9: the world's first reflight of an orbital class rocket."

Offline Steven Pietrobon

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Re: Atlas V 401 - Cygnus CRS OA-7 - NET April 18 2017 - Launch
« Reply #414 on: 04/18/2017 03:13 PM »
T+1 minute.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Online ZachS09

T+1 minute. RD-180 is throttling down to 76% in preparation for Mach 1 at 1 minute, 21.4 seconds.

We're at the zero-attack angle of flight.
"Liftoff of Falcon 9: the world's first reflight of an orbital class rocket."

Online ZachS09

T+1 minute, 21 seconds. Mach 1. Atlas V is supersonic.

And we've also gone through Max-Q, or maximum dynamic pressure. That occurred at 1 minute, 32.5 seconds.
"Liftoff of Falcon 9: the world's first reflight of an orbital class rocket."

Online ZachS09

T+1 minute, 50 seconds. RD-180 has throttled up to 100%. Currently, we're burning propellant at the rate of 1,251.2 kilograms per second.
"Liftoff of Falcon 9: the world's first reflight of an orbital class rocket."

Online Chris Bergin

LAUNCH!

Offline Steven Pietrobon

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Re: Atlas V 401 - Cygnus CRS OA-7 - NET April 18 2017 - Launch
« Reply #419 on: 04/18/2017 03:14 PM »
T+2 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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