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Questions tagged [rockets]

Questions regarding the boosters or thrusters used to propel man-made objects.

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Transportation on the Mars I Air

Due to the thin atmosphere generating lift on Mars is difficult at a lower speed, Flying is hard until aircraft go supersonic and then it becomes difficult to control(Ref.). The landing would not be ...
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2answers
261 views

What sensors or combination of sensors do rockets use during takeoff for their orientation?

I know that after using up rockets and before reaching final orbit, satellites use Earth, Sun, Star trackers to find the absolute position depending on the application and orbit. After that, they use ...
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How could asteroid 2013 ND$_1$$_5$ become a moon of Venus with the aid of rocket engines?

Notice: Although this question is similar to this one, it is different because asteroid 2012 XE$_1$$_3$$_3$ has a transitional path between Venus's Lagrangian points L5 point and L3 point, whereas ...
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1answer
142 views

Could asteroid 2012 XE$_1$$_3$$_3$ become a moon of Venus with the aid of rocket engines?

2012 XE$_1$$_3$$_3$ is an asteroid, classified as near-Earth object of the Aten group that is a temporary co-orbital of Venus. It is following a transitional path between Venus's Lagrangian points L$...
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2answers
2k views

How exactly is the pressure inside the combustion chamber monitored?

Given that temperatures in the combustion chamber are crazy high, are there any pressure sensors rated for the high temperature and high pressures located there? Or is there a cooling mechanism for ...
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1answer
123 views

Rocket name request: rocket company launching a rocket with a “punny” name

I'm trying to recall the name of a rocket. I read / watched about it this year, or late last year; unfortunately I cannot find it in my history. The name of this rocket, created by a company whose ...
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1answer
107 views

How do I prepare a preflight excel sheet template for satellite launch?

I would like to know if anybody has any advice regarding a preflight check that I am doing for a satellite. I would like to know if anybody has any experience regarding a standard excel sheet for all ...
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1answer
126 views

Is there a way to make liquid fueled rockets not lose efficiency with decreasing throttle?

As far as I know liquid fueled rockets suffer from lowered efficiency when using less than full throttle since the pressure of combustion is lowered and so thermodynamic efficiency. Could a variable ...
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1answer
171 views

A way to go to Mars and come back

I have only 6 months of knowledge about rocket science but I was wondering why can't we do the following to go to Mars and come back to Earth: We can have enough fuel in a rocket at maximum to just go ...
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26 views

How do preburners work in gas generator cycle? [duplicate]

In gas generator cycle small portion of the fuel and oxidzier is burned in the preburner to drive centrifugal pumps feeding the main combustion chamber. But how is the fuel/oxidizer fed into the ...
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4answers
4k views

Why aren't payloads their own fairings?

...or if they can, why so rarely? I mean: instead of placing a satellite of nondescript shape inside a fairing which is discarded somewhere above the atmosphere, build it in such a way that its ...
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4answers
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Why does the Falcon 9 use RP-1/LOx and not LH2/LOx?

Why does SpaceX use RP-1 in the first and second stages of their rockets? In my view at least the second stage could use hydrogen as it currently is not being reused. I am aware that you have higher ...
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1answer
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Why does the 2nd stage of Falcon 9 need compressed He tanks?

It is well known that the rapid disassembly of Falcon 9 static testing started with the rupture of the composite fibres of the copv He tanks. But what is the need to have the composite tanks ...
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1answer
513 views

Why aren't rockets made from steel?

I was reading about the sea dragon rocket and was wondering why rockets today aren't made of cheaper materials like steel? And could you make a steel rocket today?
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1answer
175 views

How Do You Build a Rocket?

The curious 6 year-old sitting next to me asks "how do you build a rocket?" What kind of rocket? "A big rocket that flies". (He came by when I was answering a question and he was very excited when I ...
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61 views

Russian Soyuz MS-09 Launch - back and forth rotation of the second stage (along the length axis). Precession?

In the ISS Expedition 56-57 Launch of Russian Soyuz MS-09, in the first view from the external camera at around 3:30, an obvious back and forth rotation (along the length axis) of the rocket can be ...
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125 views

How far have autophage rockets been developed?

Ars Technica reports on a May 24 phys.org press release/precis on a University of Glasgow paper in Journal of Spacecraft of Rockets about a solid rocket intended to consume itself during use rather ...
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950 views

Potential improvement to BFR or New Glenn if equipped with aerospike exhaust on their engines?

Aerospikes basically tackle the issue of the variability in required expansion ratio for a rocket engine to be efficient at a given altitude. A recent example though mired in legal issues is a small ...
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3answers
618 views

Can we use liquid propellants in amateur rockets?

Is it possible and worth it to use liquid propellants like liquid oxygen and liquid hydrogen in amateur rockets? What are the other types of liquid fuel used?
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2answers
1k views

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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1answer
279 views

What happened to the Atlas IV?

I was recently reading up on the Atlas rocket family, and I noticed that for some reason the numbering went from the Atlas 3 straight to the Atlas 5. Why did they skip number 4? I am familiar enough ...
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5answers
622 views

Can we thrust a rocket from earth using electric power?

I wanted to know if we can thrust a rocket from earth using electric power? If yes, how and has anyone tried to do that?
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2answers
878 views

How do I calculate a rockets burn time from required velocity?

Say my rocket could produce F newtons of thrust while consuming M1 kilograms of fuel per second. It's mass at start is M0, and it keeps burning until it reaches V velocity. How would I find out the ...
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2answers
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How do you calculate what percent of hydrogen combustion is turned into heat vs pressure?

As a high school calculus and physics student interested in aerospace engineering, I was trying to understand the basics of how a rocket works and couldn’t find an equation or any analysis online on ...
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How to make a rocket than achieve 40 miles in altitude [duplicate]

me and my friend are working on a design where a solid fuel rocket rides on a large weather balloon. The ball on would get 22 miles high before bursting, then the rocket would ignite at boat for 40 ...
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60 views

Is it possible for a space rocket to escape a planet's gravity if the gravity was 10 times that of earth? [duplicate]

I know that the scenario isn't realistic but lets assume that we have a planet which is identical to ours except that it's gravity is 10 times bigger. Would it be possible to launch a space rocket ...
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1answer
129 views

When should a rocket be launched to reach a Near Earth Asteroid like 2001 US16?

Earth takes 365.25 days to complete its orbit around the Sun. Earth also travels at 67000 mph. Asteroid 2001 US16 (also known as 89136) takes 577 earth days to complete it's orbit around the Sun. To ...
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2answers
220 views

Why is the word 'Block' used along with a number to indicate the rocket version? [duplicate]

Why is the word "block" used to indicate a rocket's version? Based on usage, I sort of understand what is meant, but I am confused why the word "Block" is used. Examples: Falcon 9 Block 5 SLS Block ...
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2answers
238 views

Safety regulations for storing, handling, and using rocket fuels?

How does a company with no experience in space (like SpaceX or Blue Origin) find out how to safely handle hazardous and flammable fuels? Are there safety regulations for how to store, handle, and ...
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2answers
257 views

Quick and dirty way to estimate flight times for constant acceleration rockets

Thought experiment: Suppose we build a spacecraft with a low thrust electric propulsion and have a flight plan that involves constant acceleration on the first half of the journey, breaking on the ...
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5answers
8k views

What is the feasibility of a rocket hobbyist achieving a LEO orbit with a microsat?

Along with being a rocket hobbyist, I'm also an Amateur Radio Operator. I would like to determine the possibility of placing a "microsat" a miniature packet radio satellite, into a low earth orbit.
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2answers
7k views

Does launching a device into orbit change earth's orbit?

Does launching a space shuttle or rocket change the earth's orbit? After all, to get momentum in space you need to throw something out.
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1answer
60 views

Energy needed to open/close entry points in a rocket

In general, how often are air locks opened on a rocket? How much energy is needed to open and close the entry point?
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135 views

The Shape of a Rocket

What is the shape of a rocket? My English teacher has challenged me with that question and I am not sure of the answer. My friends suggest 'polygon' but I believe the answer is a little more ...
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1answer
295 views

What are the falling parts in this ISRO rocket launch?

ISRO launched IRNSS-1I satellite yesterday using its versatile PSLV-XL. In the launch video (from 00:35 to 00:40), within five seconds of the launch, many large parts of the rocket are seen to be ...
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1answer
144 views

Can airplane aluminium be used in low altitude rocket? (1km)

Can aluminium which is using in airplane construction be used in rocket? I consider, 1km is not altitude where resistance can destroy some parts of important rocket. Most probably rocket impulse will ...
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0answers
92 views

Which solid fuel is optimal for light rocket?

I am in search of comparatively cheap and powerful enough solid fuel. I've found rocket candy, but is it enough to reach 1km altitude? (My aim is a 2 metre high rocket with 0.5kg of payload.)
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1answer
133 views

Why did Virgin Galactic choose N2O / HTPB as its fuel?

It seems very exotic compared to something like RP1 or Methane, especially for a vehicle which should be flying a lot and around civilians. Why was this choice made?
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5answers
8k views

How do rocket scientists do iterative development?

In software, the general process for developing anything is code, test, fix, repeat. This is easy and cheap, because running a program typically costs an incalculably small amount of money. In rocket ...
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1answer
901 views

Ion Thruster Thrust Calculation Problem

Trying to calculate the impulse of a little ion thruster I'm putting together. An old version of it can be found here, I'll be polarizing the AC current and putting in copper nails on the next ...
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1answer
269 views

very low Be4 chamber pressure

How does Blue Horizons be4 manage to achieve such low chamber pressure compared to the space x raptor engine or the shuttle main engines and yet still deliver more thrust given it does not appear to ...
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1answer
213 views

new nozzle design, is it a fail?

So I'm an amature rocket scientist. while having a conversation with a friend on a nozzles we though of a new nozzle: Its a double nozzle where it expands a lot and then compress. I want to put this ...
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1answer
138 views

Angled thrusters on the Soyuz 2.1a?

I saw a satellite launch recently (launch link) which used the Soyuz 2.1a rocket. Shortly after the launch I observed 4 symmetrical thrusters at an angle to the main thrust line. Is this for ...
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1answer
94 views

Why does the launchpad strongback outgas 60 secs before launch?

I was watching the live stream of the Iridium-5 / Space-X launch and they mentioned that the strongback would outgas a minute before launch. I assume it was to prevent the strongback from exploding ...
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0answers
73 views

Why GSLV is so strange rocket? [duplicate]

GSLV looks strange: 1. It has liquid fuel boosters and solid fuel core, while all other launchers with boosters have solid fuel boosters 2. Its boosters finish to work after core, so actually they are ...
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1answer
84 views

If anything, what can cause a rocket engine to flame out prematurely?

I would assume that dropping flow rates or a drop in chamber pressure would cause the engine to stop thrusting, but I am unaware as to what specifically these conditions might be.
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1answer
298 views

What's happening in this photo?

This is a 30 second exposure of the Falcon 9 launch on March 6th. The trail is from right to left; the photo was taken north of the launch site, about 3 or 4 minutes into the flight. I think I ...
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4answers
6k views

Why are the bottom of most stages flat?

When looking for rocket engine images, I noticed that the bottom of the stages are almost flat. That does not seem aerodynamic. I understand this is not a primary concern for upper stages (mainly ...
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0answers
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Building a Drag model for rocket optimization

I need to build a drag model for my rocket optimization program and I stumbled upon by the following formula: $CD = CD_c(M)$, $K_n < K_{nc}$, $CD = CD_{fm}$, $K_n > K_{nf}$, $CD = CD_c +(CD_{...
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2answers
154 views

Is there a point where boosters don't make sense, or are boosters always desirable to increase payload?

Consider a rocket using nuclear fuel, where the energy density is far higher. Let's stipulate that in an SSTO configuration, it's got a payload capacity like the Falcon Heavy. So, at that point, you ...