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Results tagged with launch
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user 415
Questions regarding the takeoff or the liftoff phase of the flight of a rocket and the set of activities required for preparation of the launch vehicle leading to it.
59
votes
Accepted
What "actually" happens at T-minus-0
The Space Shuttle launch sequence had the main engine ignition beginning at T-6.6 seconds, launch thrust required at T-3 seconds, and solid rocket booster (SRB) ignition at T-0 seconds. … The mission doesn't begin at T minus zero; one can even argue that the mission begins years before any launch date has been picked, and the pre-launch countdown is quite specific long before the launch …
- 7,350
17
votes
2
answers
3k
views
In the Saturn V launch sequence, what defined COMMIT, and what happened between COMMIT and L...
small distance above the launch pad, and is basically on its way (but hasn't yet cleared the launch tower). … In other words, no matter what else happened, it either rose from the launch pad, or things crashed and burned (and the LES likely saw use). …
- 7,350
23
votes
Accepted
Why don't we use catapults to get to space?
The acceleration during a spacecraft launch and climb process is nontrivial, yet much easier to manage because it can be kept to a safe level while climbing out of the worst depths of Earth's gravity well …
- 7,350
5
votes
Do any current ICBM's have the delta-V to target the sun?
Borrowing from Wikipedia's article on modern ICBMs:
One particular weapon developed by the Soviet Union (Fractional Orbital Bombardment System) had a partial orbital trajectory, and unlike most IC …
- 7,350
7
votes
2
answers
2k
views
Which STS mission raised the normal engine throttle above 100%, and what change to the SSME ...
Specifically from that answer, in STS-118, the SSMEs were run at 104.5% thrust during launch. …
- 7,350
49
votes
Accepted
Why does the SpaceX Falcon 9 rocket do a 180 flip for reentry?
You can see a diagram of the Falcon 9 launch profile at the beginning of Hobbes's answer, so I won't repeat that here. …
- 7,350