Questions tagged [rockets]

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

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1answer
39 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
71 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
101 views

Long term sustainability of Space Flight [closed]

I'm doing a little research for a fictional book that posits a future where manned space travel is not possible. What are some of the known risks towards long term sustainability of manned space ...
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1answer
92 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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43 views

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
38 views

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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0answers
125 views

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
796 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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0answers
94 views

Help on HOW to DESIGN, BUILD and TEST SMALL LIQUID-FUEL ROCKET ENGINES Step 11 [closed]

Hello please help me on step 11 I tried to solve the problem and put the problem on the calculator using the values given on the book but the answer that I get is 8.4 instead of 9.4 please help me on ...
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1answer
143 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
585 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
84 views

Bio-Fuel for Rocket Science

In the season 1 of Lost In Space Series which aired on Netflix, in the last Episode the Robinson family uses the By-products of Living Beings (faeces) as Bio-fuel. If we were to use the same thing, i....
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1answer
213 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
247 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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64 views

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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0answers
143 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
173 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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0answers
182 views

Cost of launch unrelated to cost of building rocket

ULA CEO Tory Bruno said long time ago that only 1/2 cost of orbital launch is cost of building of rocket. SpaceX never denied this. F9R block 5 total cost of launch can be about 60-80 million per ...
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1answer
178 views

Given unlimited funding and global cooperation, could there have been a manned space craft made in the year 1850-1860? [closed]

All my life, I've been speculating in my head about all kinds of "alternative timelines". One of the most intriguing to me are all the ones that concern space and "steampunk" technology. Recently, I ...
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0answers
25 views

Ares 5 and SLS relation [duplicate]

I'm having an online discussion regarding these rockets. I'm being told that I'm wrong to think of the SLS as a continuation of the Ares 5. That the SLS is a completely different rocket, and so it's ...
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1answer
86 views

Gravity turn: How to reorient along zero angle of attack

I was doing some back-of-the-envelopish calculations on gravity turns. Now the basics are clear to me (I think), but this detail escapes me: After liftoff we perform pitchover manouvre at time T+x, ...
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1answer
2k views

Is it possible to build a rocket with 2kg payload? [duplicate]

Is it possible to build a small rocket that carries 1 cubesat into orbit? And how small the rocket would be, if it is possible?
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0answers
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Were there any launch vehicles with so heavily pronounced Plume Induced Flow Separation (PIFS), other than Saturn V?

This answer describes a very interesting phenomenon of Plume Induced Flow Separation on Saturn V vehicle. (Apollo-6 S68-29737 photo, courtesy NASA) This is, basically, when "fire" from engine ...
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1answer
161 views

Help on Nozzle Throat Area Calculation

This is the equation of the nozzle throat area This equation is based from a book called HOW to DESIGN, BUILD and TEST SMALL LIQUID-FUEL ROCKET ENGINES This is the solution The problem is I don’t ...
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0answers
47 views

What is the white vapor seen immediately prior to and during the early part of the launch? [duplicate]

As most modern rockets rest on the pad much white vapor is seen. Is this propellant being vented or condensation from the surrounding air due to the extreme cold of the rocket body?
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1answer
162 views

What was the first rocket with de Laval (convergent-divergent) nozzle to fly?

Rocket engine Wikipedia article states that Goddard was the first to use a De Laval nozzle on a solid-propellant (gunpowder) rocket engine, doubling the thrust and increasing the efficiency by a ...
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1answer
177 views

Confusion about reactive force of a rocket

I am confused about the equation describing the reactive force of a rocket. I read from this source this equation: where M is mass of the rocket, u is the velocity of exhaust gas in an inertial frame ...
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3answers
270 views

When is a rocket a rocket?

A comment was offered in this question, how technically soft landing works without air on the moon?, asking "what do you mean by 'rocket'." This brought to mind the question of what is a rocket. Does ...
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3answers
2k views

How does a soft landing technically work without air on the moon?

I am curious to know about how rockets or an object lands on the moon when there isn't any air (atmosphere) and the gravity is low.
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1answer
991 views

What is the density of supercooled LOX at −206 °C, as SpaceX uses it

I want to calculate the size in cubic meters of Starship's propellant tanks. The only figures for LOX I can find are at −183 °C. 1141.7 kg/m³ at −183 °C. Could somebody please calculate it at −206 °C,...
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1answer
134 views

What's up with the lack of subminiature chemical rockets?

Not long ago, I was researching the scaling of converging-diverging de Laval nozzles to subminiature (1.5 mm throat diameter) dimensions for a non-rocket application, and later on studied the ...
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0answers
82 views

Can we use a drone instead of rocket? [duplicate]

I would like to know if it is possible to use a drone instead of the rocket to launch a satellite into orbit. If no, then I would like to know why, and if yes, then in which countries would this be ...
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137 views

Are DUMBO, TIMBERWIND, and other high-thrust NTRs realistically going to deliver on promises of very high thrust/weight?

Nuclear thermal rockets (NTRs) are notable as the most mature technology (the second-most-mature is Project Orion) to provide both high thrust and higher specific impulse than chemical rockets. But "...
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2answers
1k views

Can a VASIMR Plasma engine be used to launch a rocket?

When I was in primary school, I spent countless hours designing spaceships that probably wouldn’t work. It’s only now that I’ve stumbled across some of the old drawings and actually thought if it ...
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1answer
137 views

LANTR has been proposed; why not bilateral CHEMANTR?

Normal solid-core nuclear thermal rockets use a nuclear reactor to heat gas (almost always hydrogen, since higher molecular weights cause miserable performance) and expand it through a converging-...
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1answer
155 views

Need help with 'Tsiolkovsky's Rocket Equation': What's the maximum weight of my rockets command module?

A civilization wants to transport a command module towards another planet that is passing by. Their planet has a radius of 6'800 kilometers and weighs about 9 × 10^24 kg. They have no stronger engines ...
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1answer
64 views

What is the purpose of the pairs of cylinders on the interstage of PSLV?

In the following images, it can be seen that the interstage (separating the first stage PS1 and the second stage PS2) of the Indian Space Research Organisation's (ISRO) Polar Satellite Launch Vehicle (...
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0answers
56 views

Relationship between scaling up rocket, adding more engines and pressure inside tanks, feedlines

So can anybody say, what is relationship between scaling up rocket ( more payload to orbit ) adding more engines and pressure inside rocket tanks, feedlines. What is standard pressure inside F9R 1st ...
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2answers
172 views

At a height of 100 km, what speed do you need to be going to escape Earth's gravity?

I understand that the escape velocity of Earth is 11 km/s. However, Earth's gravitational sphere of influence is not infinite, so it is possible to go slower than that and still escape the sphere of ...
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0answers
64 views

Shuttle main engines RS-25 refurbishment/material damage

There was some thread here on Space Stack-Exchange about RS-25 refurbishment, but I am interested now, how this refurbishment look from the point of material damage of SSME hardware. In the early ...
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2answers
139 views

Static forces on a rocket engine

I am trying to understand where and how the thrust forces act in a rocket engine. I had assumed that the net thrust could be "ball-parked" as the chamber pressure multiplied by the throat area, but ...
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6answers
4k views

Is it possible to use gases instead of liquids as fuel in a rocket engine?

Im reading about rocket engines and I have a question about is it possible to use fuels in the form of gases than a liquid in a rocket engine?
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1answer
129 views

Can a lighter rocket lift more than a heavier rocket?

Let us consider two launch vehicles - "A" and "B". If "A" has a larger wet mass than "B", does this imply "A" has a higher payload capacity to a particular orbit, from a particular launch site than "B"...
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2answers
514 views

Velocity of a rocket needed to get to Mars

At 2:16 in this video, Don Pettit says he used the Rocket Equation to determine the velocity of the rocket needed to travel to Mars, which was 16 km/s. I am not sure as how he did it though, and was ...
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2answers
110 views

Looking for figures for contemporary interstellar engine options

So I have already done... a lot of reading on this subject lately. A lot. You wouldn't believe. My maths is... functional, probably far above 'average', but when it gets into the realms of the 'rocket ...
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6answers
7k views

Would rocket engine exhaust create pockets of gas in space which could hinder further space exploration?

Suppose we establish a moon base. This base would have some population, with some need for supplies, and needs for machinery in the early stages. If we establish shipping lanes in space for these ...

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