Questions tagged [stage-separation]

Questions covering how different parts of a rocket with propulsion (stages) of a rocket disconnect from each other.

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2
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1answer
44 views

What were the space shuttle’s emergency procedures for an SRB or ET separation failure?

The space shuttle, like most launch vehicles, was a multistage vehicle (albeit one where the various stages were mostly stuck to the sides of each other rather than being stacked vertically), reducing ...
20
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1answer
710 views

Why was the Polyus mounted backward?

This blog post (and other resources) states the Polyus was mounted engines facing the front and this stage must turn 180° before firing its engine. I easily imagine that staging outside the ...
3
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1answer
96 views

Why isn't the Falcon 9 first stage severely damaged by the blast of the second stage following separation?

When the Falcon 9 experiences stage separation, why isn't the first stage severely damaged by the blast of the second stage? When separation occurs, there seems to be some mechanical force to push ...
2
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1answer
103 views

Model vehicle separation on STK Astrogator?

I am trying to model a multi-stage lunar mission with STK Astrogator. The vehicle separation happens after the first Trans Lunar Injection Burn. I've been trying to figure out how to arrange the ...
8
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1answer
233 views

Why do Soviet and Soviet-derived rockets hot-stage instead of using ullage motors?

I am only aware of one US rocket that used hot-staging for maintaining proper ullage during stage seperation--the Titan family. Otherwise, US rockets tend to use reaction control systems or small ...
0
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0answers
64 views

When were “2nd stage pushers” first used?

The question Falcon 9 2nd stage pusher; how far does it continue to extend as it accelerates separation? (currently unanswered) includes (and further explains) the GIF below. Question: What was the ...
0
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0answers
53 views

Are “2nd stage pushers” limited to the Falcon-9, fairly standard, or somewhere in-between?

Falcon 9 2nd stage pusher; how far does it continue to extend as it accelerates separation? (currently unanswered) includes (and further explains) the GIF below. Question(s): Is there a better term ...
1
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0answers
40 views

Mass/weight information about stage separation mechanism

How can I get mass/weight information about rocket stage separation mechanisms that are used in multi-stage rockets? I plan to create an excel table to compare stage separation mechanisms by weight ...
3
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0answers
128 views

What is the largest energy stored in a spring or other stress-based energy storage device ever put in space?

The question What is the largest delta-v ever produced in space from mechanically stored energy? asks of course about the delta-v produced, but here I'm asking about the largest amount of stored ...
4
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0answers
266 views

Falcon 9 2nd stage pusher; how far does it continue to extend as it accelerates separation?

I've just watched Scott Manley's video SpaceX's Water Landing Reveals Rocket "Secrets" (or, What We Learned from CRS-16) (again) and he mentions the second stage "pusher" in the center of the view (...
6
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0answers
139 views

What's the sudden pitching of Rocket Lab's It's Business Time launch at separation?

In today's Rocket Lab launch of the It's Business Time mission, there was a substantial and swift change in attitude upon stage separation. It looks scary. I understand that The first stage of a ...
15
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3answers
7k views

Why not keep the engine for multi-stage rockets?

Rocket engines are a huge weight in a multi-stage rocket. and they are stacked like so: Fairing/Payload Fuel Engine -- Seperator -- Fuel Engine and so on, which means multiple engines. Is there ...
6
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1answer
545 views

Which rockets have their upper stages separating at(around) 100 km?

Are there any current rocket systems that go to the Karman line with just 1 stage without boosters? Recent Rockets like the Falcon 9 separate at 80 km. New Shepard launches recently touched 100 km ...
3
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0answers
58 views

Why GSLV uses different stage seperation mechanism for their different varients

Why GSLV mk II is using Marman mechanism for stage separation but GSLV mk III is using Collet mechanism for stage separation?
4
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0answers
97 views

Marman vs collet seperation mechanism

The Marman and the Collet mechanisms are used for stage separation in rockets and launch vehicles. Which of these is most efficient, cost wise, weight wise and ease of usability wise? Which of the ...
4
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1answer
2k views

Apollo 11 mission report shows velocity well below escape velocity thousands of km on the way to the Moon

This is from the Apollo 11 mission report. It says the vehicle was going at 7.6 km/s when the CSM separated from the third stage. It was not in orbit at this point, it was thousands of KM from earth. ...
32
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4answers
5k views

When did the concept of “stages” enter rocketry?

The staged rocket design is common now, but at some point in the history of rocket design it must have been revolutionary. When was the staged design introduced? Was it quickly accepted or did it ...
5
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1answer
119 views

1/st Stage slow down after MECO and separation for F9's

Once the Falcon 9 Full Thrust 1st Stage reaches "MECO" - main engine cut off - and separates from the 2nd Stage how much velocity does it lose? Specifically at "MECO" its velocity is approx. 5,900 km/...
6
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1answer
754 views

Did the Saturn V interstage ring burn up in the atmosphere?

In Saturn V launch footage, the interstage ring falls away shortly after stage I separation, briefly catching fire from the stage II exhaust. Does this ring continue to drop uncontrolled and impact ...
10
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1answer
876 views

Why did Amazonas5 2nd stage ignite before 1st stage separation? [duplicate]

Watching the Amazonas5 launch, and at 1st stage separation, the commentator noted that the 2nd stage would ignite before the separation in order to "maintain constant acceleration." I'm wondering how ...
6
votes
2answers
918 views

Reliability of explosive bolts and redundant initiators

Explosive bolts are often used for stage and payload separation. If only one of the many explosive bolts used fails to break into two pieces, the payload of the rocket may be lost. Are there more than ...
3
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2answers
396 views

Why is the Falcon 9 upper stage tumbling so much after separation? (SES-10)

Immediately after separation, the upper stage of Falcon 9 seems to head 30 or so degrees sideways. What causes that? Is it a problem or a feature? Separation occurs at 4:40 in this video of the ...
38
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1answer
4k views

Why do the Russians use these fence-like interstage fairings?

When we look at various Russian rockets we often see a metal structure looking like a kind of garden fence separating some stages. To my knowledge, only the R7 family (Vostok, Voshkod, Soyuz) and N1 ...
11
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2answers
505 views

Why does Blue Origin land the crew capsule separate from the booster?

New Shepard of Blue Origin separates the crew capsule from the booster. The crew capsule is in free fall for a while, then the parachutes open and finally the landing rockets give a brief impulse to ...
23
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2answers
3k views

Why does the Soyuz Rocket system fire the third stage while stage two is still attached?

Also, I believe that the second stage continues to burn for quite some time even after seperation of stage 3.
33
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6answers
7k views

Why is there a “coasting” phase in some space launches?

During the PSLV (India's Polar Satellite Launch Vehicle) C24 launch on 4 April 2014, once stage 3 (PS3) had burned out, it wasn't immediately jettisoned, but instead there was a coasting phase for ...
16
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1answer
560 views

Is there an explanation for repeating Soyuz accidents involving misfiring of explosive bolts?

In the Soyuz program, quite a few accidents have been caused by malfunctions of the explosive bolts: Soyuz 11: Explosive bolts designed to fire sequentially fired simultaneously instead, causing a ...