Questions tagged [stages]

Rather than carry empty weight all the way to orbit, rockets usually use a stage system. Stages can take many forms and have over the years.

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Efficiency of rocket stages and converging/diverging nozzle

It is a fact (to the best of my knowledge) that for optimum thrust from a rocket engine, one of the most important factor is the design of its converging/diverging Nozzle - the diverging cone to be ...
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When does Falcon 9 second stage separate?

For a regular LEO payload, when does the second stage separate? Usually the first stage separate 2:30 min after launch (and it takes 6 minutes to come back to Earth) so how about the second one? ...
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Rocket staging by use of strap on Boosters

Will it be advantageous to have multiple (say-3) stages of a rocket, arranged in a "strap-on" type SRBs' assembly, geometrically well distributed around the circumference w.r.t. their ...
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Why aren't there more 1.5 stage rockets?

Why aren't 1.5 stage rockets, like the SM-65 Atlas, used as small sat launchers? It seems to me like that would be simple as you don't need as many tanks and the plumbing to connect the to the engines ...
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How many stages were used to put Iran's satellite NOUR 01 (45529) into its orbit?

Fox News' Iran-launched military satellite entered Earth's orbit, US Space Command announces says: “Iran’s first military satellite, Noor, was launched this morning from central Iran in two stages. ...
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Continuous staging? [closed]

In industrial chemistry it's well known (Armagnac vs. Cognac) that continuous processes are more efficient than batch processes. In-game microtransactions have competed so favorably with just ...
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Is the space shuttle the only launcher that jettisson tank without any engines in its staging process?

All launcher I know jettison stages composed of both tank and engines. I do understand that: the jettison process is useful to get rid of dead weight jettison engines allows the use of more suited ...
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Why aren’t rocket stages modular and interchangeable?

Being an avid player of Kerbal Space Program, it is intensely frustrating to return to the real world and have to remind myself that rocket stages can’t generally be swapped out between rockets (...
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How often did launch vehicles have a “Stage 0”, and what does it mean exactly?

While trying to do some reading for the question Need help understanding staging shown in infographic of Titan launch of Hexagon satellites I ran across the Wikipedia article for Titan III. This ...
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Super Capacitor Stages

Could this super capacitor be up scaled to be of use in the lower stages of a rocket? Here is the only information I found online on this? Related: Could rockets ...
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What does the core stage of a launch vehicle mean?

I have seen the use of the term 'core stage' in the context of space launch vehicles. I am not able to clearly understand what it exactly means? I have learnt about launch vehicles having multiple ...
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Could a rocket launch off water horizontally in stages us using water and air for lift to save fuel? [duplicate]

A term I have heard is the "water was like class". Meaning that the water had 0 waves. Could a rocket be modified to take off a horizontal surface starting slowly increasing throttle on each stage? ...
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Highest stage count that are used one right after the other?

Two questions inspired this question: Highest stage counts in actual launchers? Answer: Saturn V six stages to the Moon Does a high staging number have diminishing returns? Is there a way to address ...
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Does a high staging number have diminishing returns? Is there a way to address that mathematically?

I was reading this question: Help me understand what Farside, a ten "stage" rockoon looked like? How was it configured? Comments link to Highest stage counts in actual launchers? but here ...
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Why do rockets not glide back?

After stage separation, why do the rockets not glide back to Earth with wings? Is retro propulsion a better idea than gliding rockets back to 'Earth'? Take Energia-II as an example: Source: buran.ru ...
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Could rockets launched from the ground use wings in the stages?

Could a slower or smaller rocket take advantage of lift if all the stages had wings? Could the stages reduce splashdown impact forces by using a spinning seedpod-like design (as shown in the image ...
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Why does PSLV use four stages to get to LEO, and why do they alternate solid, liquid, solid, liquid?

Is there a simple way to explain why ISRO's PSLV launch vehicle uses four stages to get to LEO, and why they alternate as follows: ...
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What is the most number of stages, including fractional stages?

Falcon 9 clearly has two stages, but the smaller two-stage Electron has a "kick-stage" so some might call that 2.5. The question Quantitative benefits of Atlas II's engine-dropping or 1.5 staging? and ...
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Would there be any advantages for a rocket with two “half stages”?

A "half stage" is a rocket stage which separates with its engines, but not fuel tanks. Common examples include Atlas (1.5 stages), Atlas-Agena (2.5 stages), and Atlas-Centaur (2.5 stages). On paper, ...
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Is Asparagus Staging Possible

Sorry if this is the wrong place to ask this question, as its very much hypothetical. In the computer game Kerbal Space Program , there are 3 main Staging Options that are used Conventional Staging ...
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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 ...
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What would be necessary in order for us to achieve a single stage to orbit, reusable rocket?

I have read articles and seen videos explaining why an SSTO (Single Stage To Orbit) rocket* is not possible. But I was wondering... What would be required to achieve this? Answers can be literally ...
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How rare is it in the 21st century to use five stages to get to LEO, especially for a low-mass payload?

@BobJacobsen's comment about the MX Missile (and protests) in the 1980's got me clicking in Wikipedia, which led me to the Minotaur IV launches, the most recent of which seems to be ORS-5 or "...
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What do we mean by rocket stages?

I'am new in the field of rocketing and space,i wanted to know what do we do by adding different stages to a rocket and it's used for what, and if we add a second stage we can put another booster on it ...
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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 ...
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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/...
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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 ...
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What is used to connect the side boosters to the first stage?

For example, on the Falcon Heavy, the two side cores detached from the first stage but how are they attached and what mechanism is used to detach them?
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Why won't Falcon Heavy launch with 100% thrust?

The crossfeed system is not yet realized for Falcon Heavy. Instead, the central booster will throttle down after liftoff and resume "full thrust after side boosters separate". Why would one do that ...
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How can I obtain the necessary thrusts / mass flow rates to achieve a given burnout velocity for an optimally staged rocket?

I understand how to use lagrange multipliers to obtain the optimal stage masses given the payload mass, the burnout velocity, the structural ratios of each stage and the specific impulses of each ...
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Understanding the multi-stage mass tables in Wiesel's Spaceflight Dynamics

In Wiesel's Spaceflight Dynamics, 3rd Edition (2010) Chapter 7.5 (pg 220), there is a table of mass values for Von Braun's 1951 design for a three-stage space station supply rocket. In the book, the ...
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Why was the Minotaur V built as a 5-stage design?

Why is Orbital Science's Minotaur V rocket a five stage design? I am aware this is derived from an ICBM design, but why would anyone want a five stage design for launching non-lethal payloads? It ...
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What types of decoupling mechanisms to separate spacecraft are used in spaceflight?

For a project I have to find select a decoupling mechanism for a spacecraft. I have searched google but I can't find any documentation on decoupling mechanisms. I need to know what types of decoupling ...
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What is the legal status of waste rocket parts ending up in the ocean?

Since most rockets are 'expendable', and perform re-entry over sea, their parts either burn up or end up in the world's oceans. It there any legal basis for the waste (pollution) that ends up in the ...
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Can landing modules use left over fuel from earlier stages?

I just read a comment by @RussellBorogove about the Apollo 11 abort options that the landing module had about 700 pounds of fuel left on touchdown. I assume that this is the intended behavior for any ...
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Using lower stage as reaction mass

As I was thinking about the process of stage separation, I realized the empty stage dropped, often many tons, is usually separated quite gently, moving at sluggish couple of m/s or less away from the ...
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Could the Atlas-B (SM-65B) have made it to orbit without jettisoning the first-stage engines?

Related to this question about single-stage-to-orbit vehicles, the Atlas-B launch vehicle seems to have been the closest to a true SSTO solution. Although it did jettison booster engines, the vehicle ...
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Is it possible for the Space Shuttle Solid Rocket Boosters (SRB) to hit the Space Shuttle after jettison?

We all know that the Space Shuttle Solid Rocket Boosters (SRB) were the pair of large solid rockets used by the United States' NASA Space Shuttle during the first two minutes of its powered flight. ...
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What was the first large rocket to use APCP solid fuel?

I'm surprised wikipedia doesn't have a history section for its APCP article. If I'm not mistaken, early solid rockets used something other than APCP, and really really early solid rockets used black ...
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For a typical Shuttle mission, how much solid fuel is leftover at SRB separation?

If I understand correctly, solid booster rockets never expend literally all their fuel before jetissoning, because the burn rate slows way down in the end and it would take too long to spend it all, ...
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A cryo tank within another cryo tank…is it a sound engineering concept?

Here's the idea: A large spherical LH2 tank is placed inside a spherical LOX tank. The reason I thought of this is so the inner tank doesn't need to be insulated. It doesn't need to be a double-...
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Why do Proton rockets use two types of main engines in its second stage?

The second stage of Proton (8K-82K) rocket has two types of main engines (RD-0210 and RD-0211). Does someone knows why?
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Falcon Heavy first stage abilities

If you made a '2nd stage to orbit and return' vehicle capable of sitting atop the reusable Falcon Heavy 1st stage, how heavy could it be, and to what height and speed could the 1st stage push it in a ...
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What are the “nacelle” like protrusions on the first stage of Black Arrow?

I noticed these “nacelle” like protrusions on the first stage of Black Arrow while browsing Wikipedia. They look like they're spaced unequally but symmetrically in two sets of two around the first ...
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Optimum velocity for first stage separation in a two-stage launcher

Looking at the numbers that are given, for example, at the SpaceX launches, it seems that the velocities at first stage separation are a bit above 2 km/s. The second stage does all the rest of the ...
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Regulation governing the use of ocean areas for the return of space objects?

What are the rules governing international use of water areas to dump used spacecrafts from orbit or launch trajectory. (source: Wikipedia / Nasa) This would apply to rocket stages, boosters, tanks, ...
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How is rocket engine cutoff controlled?

In a typical, modern satellite launch, what triggers the cutoff of the orbital insertion stage's rocket engines? I can think of three basic possibilities: Compute how much fuel you need for the ...
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SpaceX Falcon 9 Reusable first stage propellant for return

How much propellant is required to return the Falcon 9 Reusable's first stage after separation?
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Why do rockets separate from both its strap-on booster cores simultaneously instead of one at a time? (Delta IV Heavy, Falcon Heavy, Angara)

The basic idea of staged rocketry is to get rid of the mass of empty tanks et cetera as soon as possible during launch, isn't it? So you would ideally want to drop them one at a time as soon as they ...
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The oldest US space launch vehicles and stages still in use [duplicate]

What are the oldest US space launch vehicles, or vehicle stages still in use? I will definitely give you upvotes for answers suggesting any rocket or stage first launched in 1957-1965 and still in ...