Questions tagged [rockets]

Questions regarding the boosters or thrusters used to propel man-made objects. For rockets firing opposite the primaries, see [retrorockets]. See wiki for other related tags.

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20 views

What formula to calculate the surface tension between the Ethanol and Liquid Oxygen?

I am working on Pintle Injectors and require the formula to calculate the surface tension between ethanol and liquid oxygen to find the Sauter Mean Diameter ?
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1answer
132 views

Using side thrusters on a missile to create an angular acceleration

Assume a rocket is standing on the ground with mass = 1000 kg, and near the top of rocket we apply a force of 100 N for say 1 sec, now assume that this is sufficient to tip the rocket over/start ...
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Why did SpaceX swap the LOX and CH4 tanks between Mk1 and SN1?

According to most sources, the Starship Mk.1 had its LOX main tank (not talking about the header tanks here) on top and its main methane tank below. But it seems the SN1 revision, and all subsequent ...
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399 views

Do mixture ratio always need to be constant throughout the flight?

What factors can change the mixture ratio of propellant? I think they can be changed to control the thrust of a rocket.Stay safe. EDIT:What about considering only one stage? Do they change or can they ...
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1answer
118 views

What space simulators are the most accurate at simulating real world physics?

We've all at least heard of KSP, a popular space flight simulator. its not the best but can teach someone the basics at rocket science, delta V, burntime, basic orbital maneuvers, retrograde, prograde,...
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How is solid rocket fuel sourced?

I know that Orbital ATK builds solid rocket boosters, but where do they get the bulk material from? Is there a single supplier or multiple suppliers of solid rocket fuel or do motor manufacturers ...
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1answer
107 views

Is “liftoff mass” = “ignition mass”?

The answer to How much propellant is used up until liftoff? makes me wonder whether the terms "ignition mass" and "liftoff mass" have widely accepted precise meanings. Does anybody have an ...
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Can we re-fuel solid-core nuclear thermal rockets?

Most solid-core nuclear rocket designs seem to have a rather short fuel lifetime (and one that wastes most of the uranium or plutonium) due to the buildup of fission products (combined with the very ...
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5answers
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Why is NASA building its own rocket for the moon mission when it could use SpaceX's?

I read in this article that NASA is building its own rocket for the moon mission. Why would they build their outdated and inefficient rocket, when they could instead use a SpaceX rocket and use their ...
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1answer
637 views

How are fuel/hydraulics pipes coupled in spacecraft?

How are pipes coupled in spacecraft? I found Shape memory alloy pipe couplings (SCoup, see image taken from link) are sometimes used. -Is this still the case and in what quantity are they used? -...
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1answer
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Moment of Inertia of rocket

I am trying to model a rocket launch, and am trying to calculate its moment of inertia at each instant. I am assuming a two-stage rocket with a liquid fuel tank, plus a payload (nosecone-shaped for ...
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1answer
106 views

Calculate rocket centre of mass

I wish to calculate the centre of mass of a two stage rocket, for example the Falcon 9. Since the mass of the rocket is constantly changing (first the mass of the first stage is depleting, then the ...
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Relativistic Rocket Equation

I am familiar with using Tsiolkovysky's Rocket Equation, $$\Delta v=v_{e} \ln \left(\frac{m_{i}}{m_{f}}\right)$$ However, after trying to work out an exhaust velocity needed in a hypothetical ...
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Rocket to launch 8 cubesat to LEO at an equidistant distance

I am working on a project, which consists of the launch of 8 cubesat 1U to LEO (Low Earth Orbit) and I started working on the launch part, the idea of ​​the project is to be as cheap as possible, the ...
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1answer
163 views

How did NASA calculate 22 million “rocket horsepower” for the SLS Booster?

This answer to Does NASA really report the power of rockets in horsepower? cites NASA news item Space Launch System Booster Aimed and Ready to Fire which says "What's impressive about this test is ...
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1answer
153 views

Does NASA really report the power of rockets in horsepower?

On a recent episode of The Late Show with Stephen Colbert, Dr. Neil deGrasse Tyson said: And to this day NASA will still report the power of rockets in horsepower, which is completely absurd, ...
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1answer
149 views

How is the water from a launchpad recovered? (If it is)

Knowing that the water on a launch is used for both noise suppression and surface cooling, do they recover the water that isn’t evaporated by the launch to use again? And if they do, how so?
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108 views

Bipropellant RCS systems: Do they go together with docking? Or with manned spaceflight?

In a recent discussion, I asked about using a certain bipropellant system for RCS thrusters (I was actually thinking about it as fuel for an MMU jetpack or the "scooter" commonly imagined in science ...
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1answer
89 views

Shape of satellite launch vehicle

I was watching videos on YouTube, and I came across a fact that satellite launch vehicle has shape like a nose or you can ogive shape and I search on Google related to that, and I found that it ...
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2answers
4k views

What is a thrust puck on Starship?

Elon Musk recently mentioned a Thrust Puck on Twitter, "We’re stripping SN2 to bare minimum to test the thrust puck to dome weld under pressure, first with water, then at cryo." He also mentioned ...
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Have there been any rockets that run seven engines at the same time?

Answers to Rockets with n-engines, for n = 1, 2, 3… cover all single digit nontrivial† values except for seven, so... Question: Have there been any rockets that run seven engines at the same time? ...
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1answer
157 views

What are the most effective deep-space propulsion systems?

I am looking for a powerful propulsion system for deep space missions. I am between a powerful ionic motor or a VASIMIR (variable specific impulse magnetoplasm motor). What do you think? The idea ...
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1answer
58 views

Calculations needed to full-design a rocket

Suppose I want to put a cubesat in Titan's orbit (saturn's moon). and I want to calculate what rocket power I need, how do I calculate it? Where do I begin? total mass of the probe or delta-v needed? ...
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Apollo 4 vs Apollo 8 plume

I was recently browsing photos of early Apollo missions and noticed that the plume of the Apollo 4 during launch is significantly bigger than that of Apollo 8. Wondering why is that? Apollo 4 (top) ...
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2answers
259 views

Hydrocarbon + Nitrous Oxide: Is this a “friendly” alternative propellant system to hydrazine and NTO?

Even if you don't care about hypergolicity, there's the serious problem that most storeable chemical fuels are either horrifically toxic (like N2O4), dangerously unstable (like high-test peroxide), or ...
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How dangerous are RCS thrusters?

How dangerous are RCS thrusters, in a vacuum, to A. other spacecraft, especially when docking, and B. astronauts in EVA suits? How far away do you have to be to be safe / do RCS thrusters need to be ...
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4answers
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If the ISS had an emergency, how long would it take to get a rocket to it?

If there was an urgent need to launch a rocket to the ISS, how long would it take to have a rocket ready to launch? I am trying to understand what factors take up the time to prepare for a rocket ...
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115 views

What performance can be expected from chemical rockets under Venusian atmospheric conditions?

Is it feasible to use either solid or bipropellant liquid rocket engines to lift off from the surface of Venus? "Reference datum" air pressure on Venus is around 9.3 MPa; even on the top of, say, ...
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2answers
99 views

What is the theoretical max specific impulse of rotating detonation engines in space flight?

I am curious if a rotating detonation engine were made stable, how much more efficient it would be than a standard rocket engine. With a methane or hydrogen and LOX mixture, what is the theoretical ...
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1answer
90 views

Can a petroleum engineering graduate work as a rocket designer? [duplicate]

So basically, I'm in the field of PE. Would it be possible for me to be part of or work with the team of rocket designers in an aeronautical company? I'm asking this question because I have studied ...
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1answer
72 views

Calculating trajectories of payload fairings

How can I calculate the trajectory of a payload fairing assuming that I have several data points of height or speed of rocket? I'd like to know which topics are necessary to study this.
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1answer
160 views

What are common rocket fuselage designs?

I am wondering about the basic design considerations when building a rocket body. is it made as a separate hollow cylinder with standalone tanks inserted inside? is it made so that the tank walls are ...
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2answers
193 views

Long term sustainability of Space Flight

What are some of the known risks towards long term sustainability of manned space missions? Or put another way: What are the limited resources that could keep a future mankind grounded?
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1answer
120 views

Thrust value for a metallic hydrogen rocket-propelled spacecraft traveling on brachistochrone trajectories?

Using the attached nomogram for computing brachistochrone trajectories to other bodies throughout our solar system, I am working with the assumption that this spacecraft travels with a constant ...
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Help on Rocket Injector Equation

Hello can someone explain me how can I get the value of (6340) because when I try to solve the given values on the book I get (6423.980075) when I round it off it is still not the right answer can ...
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1answer
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Looking for dataset of trajectory data consisting of latitude, longitude, altitude and time

I am working on a project in which I need to cluster trajectories of different type of flying objects like rocket, plane, missile, etc. For that I am looking for a database or data-set which contains ...
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How was the Saturn 5 rocket measured? PI tape, Micrometers, calipers? [closed]

I am wondering what type of gauging was used to inspect and verify the Saturn 5 rocket?
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1answer
811 views

Atlas Rocket Burning Hose

I was just watching The Right Stuff for the 100th time,and I've always wondered what is that hose spewing flame/burning propellant out of the bottom of the rocket. It's definitely not an engine,and ...
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1answer
162 views

How long does it take to refuel a rocket?

I've been wondering how long the refueling of a rocket, say the falcon 9 takes. That's it.
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1answer
630 views

was Saturn V engine J-2 throttleable?

Were the J-2 engines of the third stage of Saturn V throttable? I know that the F-1 for first was not, but what about J-2? I could not find any information about it. Any reference or info for this? ...
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2answers
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Bio-Fuel for Rocket Science

In season 1 of the 2018 Lost In Space Series which aired on Netflix† the last Episode has the Robinson family using the by-products of living beings (faeces) as biofuel. If we were to use the same ...
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1answer
221 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 ...
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3answers
4k views

What is the story behind specific impulse being expressed in seconds?

I've heard a couple of explanations but none of them quite make sense. One was that the German rocket engineers used metric and the American rocket engineers used the English system and seconds were ...
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1answer
255 views

What percent of fuel is consumed in powering the turbopumps? [closed]

The RD-170 consumes 5,300 lbs of fuel per second, including oxidizer. The turbopump produces 230,000 hp. If one assumes that roughly 1 lb of fuel is required to generate 1 lb of thrust (obviously this ...
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1answer
61 views

Government Bodies and Space Exploration [closed]

My question is rather a opinion based one. Why does Government Space Agencies (all) not run behind Reusable Launch Vehicles when they know slight hike in budget can significantly contribute to Cut ...
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4answers
6k views

Advantages of launching very large rocket while submerged, buoyant, in a body of water

I vaguely remember reading about some supposed advantages of launching very large rockets (Saturn size and larger) from underwater in an ocean or similar large body of water. I was recently reminded ...
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7answers
8k views

How much stronger does gravity have to be for space travel to be impossible? [duplicate]

I’ve heard that only a slightly stronger gravitational pull would make it impossible for rockets to launch. Is this true? I’ve heard this used as the reason why humanity is meant to be in space.
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How are rocket launches scheduled?

With all the satellites and other objects already in space; how exactly are launches scheduled and coordinated? Is there some kind of clearinghouse? How do the mega constellations affect the ...
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144 views

What are these wires on the side of the SLS core stage?

I was reading about the SLS core being moved for testing and I noticed something odd on the core stage. There's several lines on the stage, which in closer inspection are wires. It's not obvious what ...
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1answer
175 views

Where are the lost RS-25D Block 2 engines?

There were 21 RS-25D Block 2 engines made. Two of them never flew. Three of them were lost with the Columbia disaster. 16 of them are tagged for SLS's use, including 14 previously flown, and the two ...

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