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Mike Curie, NASA Launch Commentator: And liftoff at dawn.
The dawn of Orion and a new era of American space exploration.
Steve Agid, ULA Launch Commentator: (inaudible) engine cold on the first stage.
Passing 25 seconds. Velocity 1,341 feet per second.
Passing 31 seconds.
Still looking good.
Good engine control.
Good chamber pressure in all three boosters in
the full power mode. 40 seconds in.
Standing by to go to the partial thrust mode in the core.
And we have partial thrust command in the core.
Core pressure beginning to drop as expected as we're coming up on the one minute
mark. Mark, one minute into the flight, still looking good.
With chamber pressure in the core, the booster in the partial thrust mode,
with good chamber pressure in the port and starboard in full power mode.
One minute, 15 seconds into the flight, we have the hydrazine supply valve open in the
second stage.
One minute, 22 seconds in, MaxQ. Maximum dynamic pressure on the vehicle.
Passing 1-24, Mach 1. Orion and Delta IV now transcending the speed of sound.
One minute, 31 seconds in. Good engine control on the first stage.
Coming up, 1 minute, 40 seconds. Velocity now 1,341 feet per second.
One minute, 50 seconds in.
Still looking good. Coming up on two minutes.
Two minutes into the flight.
Good engine control on the first stage.
Port and starboard boosters still at good chamber pressures in the full power mode and
a good core chamber pressure in the partial thrust mode.
Two minutes, 22 seconds in.
Two minutes, 35 seconds in, still looking good.
Coming up on the 2 minute, 43 second mark.
Mark, 2 minutes, 43 seconds. Delta IV Heavy rocket now just weights one-half as much
as it did at launch. But in propellant, the rate of 4,744 pounds per second.
Three minutes, one second into the flight, still looking good.
Passing Mach 5.
Three minutes, 16 seconds in. Good engine control.
Less than one-half minute remains on three booster flight.
Three minutes, 30 seconds in.
We're standing by for the command to go to the partial thrust mode in the port and
starboard booster.
That command should occur about 10 seconds from now.
And we have partial thrust command port and starboard to be toggling down to the
partial thrust mode.
Standing by for main engine cutoff.
We have cutoff in the port and starboard and separation of, good separation of the port
and starboard boosters.
Core booster now powering up to the full power mode.
Four minutes, 10 seconds into the flight.