Questions tagged [ascent]

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1answer
461 views

Does MAX Q during rocket launch only say that rocket experiences max dynamic pressure? [duplicate]

I know that during rocket launch, one main event that occurs is MAX Q where the rocket experiences maximum dynamic pressure which is simply (1/2)ρv^2. I also know that drag coefficient of rocket ...
14
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2answers
3k views

Could one survive a ride into orbit outside a rocket?

Another question asked whether a Falcon 9 class rocket could reach orbit with a the person (-like mass) duct-taped to the outside of it, in spite of the resulting mass asymmetry. The consensus of one ...
4
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0answers
70 views

Which crewed spacecraft provides the gentlest ascent?

The Space Shuttle is considered to be the spacecraft with the gentlest decent and landing. I was surprised to learn that its ascent was quite a rough experience. So I was wondering: Which orbital ...
6
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2answers
279 views

What is the cause of the horizontal drift in the ascend path of the Starship and other rockets?

As can be seen in the available videos on-line and in the following picture, as the rocket ascends, a horizontal drift in its path can be seen. I have forgotten the calculation of the Coriolis effect ...
2
votes
1answer
143 views

How long do the ascent and the descent of Virgin Galactic's spacecraft take?

The VMS Eve mothership releases the VSS Unity spacecraft after ca. 48 minutes. The total duration is approximately 2 hours. As a result, the ascent time + the descent time that the Virgin Galactic's ...
2
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1answer
243 views

Where does a Falcon-9 get the hottest during launch, and how hot does it get? (aerodynamic heating)

We know there is a Max-Q point1 during a launch, have an approximate altitude, equations for it's pressure value and suspect it lies very near the apex of a rocket's nose. But is there a "Max-T&...
3
votes
1answer
135 views

Find the jump condition of the mass costate of a Launch Vehicle ascent problem solved via an indirect method (Pontryagin Minimum Principle)

I'm trying to solve a trajectory optimization problem for a class of problems like the old Altas-Centaur SLV3 Centaur launch vehicles. Those are a stage and a half design where the 2 LR-87 engines ...
4
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0answers
46 views

What were the earliest rocket payloads (US and Russian) that supported coasting at anywhere in the ascent?

I know that sequential staging of rocket boosters was problematic, leading to Atlas stage-and-a-half and Russian hot staging. At what point did rocket boosters have attitude control allowing them to ...
4
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1answer
315 views

How many Lunar Module Ascent Engines were produced? How many still exist?

I know of two LM Ascent Engines still in existence. I believe Grumman built 13 Lunar modules. I also think at least 5 engines were tested at White Sands. So that is 18 that were built at a minimum. ...
4
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1answer
349 views

When during the flights did astronauts use the Valsalva device?

A spongy material is installed to the inside helmets called the Valsalva device (top right in this image) allow astronauts to do the Valsalva maneuver to relieve pressure on their eardrums when there ...
3
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1answer
146 views

Estimate of how fast will the Starship/Super Heavy be moving 5 and 10 seconds after liftoff?

I am wanting to make a comparison of the expected initial seconds of the ascent of the Starship/Super Heavy compared to the similar time of the Saturn V ascent. If this chart (from a NASA space math ...
5
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1answer
631 views

Seeing the ground from the shuttle before launch?

With the side windows in space shuttle cockpit, as seen in this photograph, could the commander and pilot see the ground at all before launch or during the first 10-15 seconds of a shuttle ascent? ...
2
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0answers
111 views

Unusual position of shuttle astronauts' arms during ascent

During the ascent of STS-135 the astronauts seem to be keeping their elbows up away from their sides with their hands forward. It can be seen throughout the ascent, here are two clips when it happens....
13
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1answer
4k views

Why did a shuttle astronaut have an open book during ascent?

In the top right of the video of a shuttle launch an astronaut has an open book resting on (attached to?) the left thigh. What was the purpose of this book? The astronaut then seems to take a pen or ...
4
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1answer
329 views

Did the Saturn V have the status check “go at throttle up”?

I'm familiar with that shuttle status check, "go at throttle up." Did the Saturn V have the same, or similar status check vocalized during the ascent? Did the Saturn V have to throttle down during ...
3
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1answer
178 views

What are the G-forces of Soyuz 3rd stage engine cutoff

Follow up to my previous question Third stage engine cutoff of Soyuz looks most intense, why is that?. The third stage cutoff gives a pretty good kick to the cosmonauts, cued video at about ...
8
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4answers
385 views

Why is Soyuz's third stage's engine cutoff the most intense?

Based on the motion and reaction of the cosmonauts, the 3rd stage engine cutoff (cued video) at about T+ 08:46 in this video of a Soyuz ascent causes greater ...
2
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0answers
126 views

Stars visible during ascent?

Did any shuttle astronaut indicate at what altitude they were first able to see the stars during an ascent to orbit at sunrise? Yeagar seeing the stars in The Right Stuff. For illustration purposes ...