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Questions tagged [rockets]

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

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1answer
2k views

Shorten trip to Mars

As someone adviced me in a previous thread, I want to ask a question related to Can you refuel chemical rockets to increase the speed?. If the numbers in this comment and this comment of @...
2
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1answer
87 views

Vented interstage for the final stage of Saturn V

As we can see in the figure below, the interstage between the escape module and the command module is vented. Why did they go for vented interstage? Wouldn't it increases the serodynamic loadings and ...
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6answers
2k views

Can you refuel chemical rockets to increase the speed?

Chemical rockets have max delta v ( max.speed ) about 10 km/s. Can you refuel them in deep space to increase the speed? For example Nasa Deep space habitat (DSH). Once it is assembled in orbit ...
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1answer
56 views

Could a gyrojet fire arm be used in space or has it?

Saw a cool article about gyrojet weaponry and was thinking that these guns could probably be pretty useful in space. Mainly I was thinking more of a space grappling hook than space weaponry. 380 m/s ...
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0answers
78 views

Do rocket labs store propellants at higher pressure than the other rockets?

It is known that the Rutherford engines run on an electric pump-fed cycle. There must be a trade-off between the tank pressure of the electron rocket and battery capacity, for batteries are dead ...
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0answers
31 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?
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0answers
39 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 ...
3
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1answer
237 views

What is the thickness of the Falcon 9 - Electron outer casing (outer shell)?

What is the material of the Falcon 9 outer casing/electron shell, and what is the technical jargon for that specific part?
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1answer
104 views
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3answers
4k views

Do rockets, launch vehicles or spacecraft contain a black-box?

Like aeroplanes, do rockets also contains some black-box kind of thing to see what went wrong at the time of failure?
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2answers
924 views

Post processing of destruction of a rocket

If a rocket fails whether on the launch pad or after the lift-off, how is it determined what component failed? What are the different methods by which failure is determined?
3
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1answer
89 views

How is payload fairing designed?

What are all the design criteria considered when designing a payload fairing (some are payload volume, drag) ?
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2answers
152 views

Do some solid rockets burn faster at the bottom? What's an extreme case?

Discussion in comments below this answer relate to how much solid rockets or SRBs burn bottom-to-top versus radially outward. I am sure I've seen a diagram somewhere showing that different designs ...
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3answers
172 views

3* Tonnes Unaccounted for in Falcon 9 FT Weight Wikipedia Calculation?

On the Falcon 9 FT Wikipedia page, the fully fuelled weight of Falcon 9 is only 546 300kg instead of 549,054kg as stated on SpaceX website. 546,300 kg - Wikipedia ...
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0answers
87 views

F1 engine specification?

I am collecting the engine specification data of different engines. I want to know the nozzle length and combustion chamber length and diameter of the F1 engine of Saturn-5. Please give some ...
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0answers
66 views

How is supersonic rocket exhaust able to match sea-level pressures?

I understand that the diverging portion of a rocket nozzle speeds up the flow and also expands it, in order to best match ambient pressure outside. However, doesn't higher speed flow lower the ...
2
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1answer
45 views

Center of gravity calculation for any rocket or launch vehicle

I understand that the the center of gravity can be calculated by making a 3D model of the rocket or launch vehicle when it is completely filled and stationary. But in case of continuous ascent (i.e. ...
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2answers
511 views

Does anyone know how to calculate the KG per second of RP-1 and LOX from the 9 Merlin 1D engines?

as can be seen from the title, I have been through at least 1,000 chrome tabs in the last few hours trying to find some form of definitive answer, but I've found absolutely nothing. Could anyone help ...
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3answers
127 views

Have there been any other cheap, modular launcher designs like the OTRAG?

The OTRAG rocket is an interesting design. Vehicles would be assembled from 4 to hundreds of identical rocket modules. By using an extremely simple design, producing the modules cheaply using ...
4
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1answer
172 views

Which existing or near future rockets will be able to get to the Moon?

Which existing or planned in nearest future rockets will be able to get to the Moon with a payload of about 1000 kg? For example with the Astrobotic Lunar Lander: https://spacenews.com/astrobotic-...
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0answers
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Parker Solar Probe Launch - Burning Flame [duplicate]

When watching the live launch of the NASA Parker Solar Probe, I noticed that there was a burning flame near the launch site (bottom left in the image) My intuition tells me that it's hydrogen that's ...
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2answers
2k views

What kind of antimatter engine is this?

I found this diagram while looking up diamagnetic machines. Could anyone explain what engine this is?
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2answers
258 views

Aerodynamically - can a rocket be over 30 meters in diameter?

The past and current designs of rocket launchers have diameters up to 8-10 meters (Saturn-5, N-1, SLS, BFR), up to 13-14 meters for max cross-section dimension for Space Shuttle and Energia-Buran (...
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3answers
207 views

How does a rocket in space go faster than its own rocket engine gas velocity?

How can a rocket in space go several times faster than its own engine's gas velocity? Doesnt this break Newton's 3rd law? Gas velocity, 12,800kph, rocket speed 40,000kph?
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2answers
61 views

How would the rocket differ in a higher atmospheric or ambient pressure?

I imagine the both rocket nozzles in either environment underwater or Jupiter or underground would have to be different than that of standard rocket nozzles because of the back pressure. In this ...
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1answer
111 views

What is the “baby rocket” attached to the booster on this rocket? [duplicate]

@OrganicMarble's answer shows some very cool looking historical rocket launches. What is the smaller structure attached to the booster on the right side, that looks like a "baby rocket"?
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2answers
143 views

How would the US military switch to re-usable rockets?

The Ars Technica article After 25 years, military told to move from “expendable” to “reusable” rockets gives me pause. The military rockets I'm aware of generally explode at end of mission by design (...
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0answers
47 views

Explosion at the launch pad and safe distance from it

As the rocket explodes at the launch pad, heat wave, sound wave and debris spread around the launch pad. So in case How the safe zone is determined in the case of explosion of the rocket at launch ...
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2answers
83 views

Rocket - calculate angle of attack to reach goal point

I am trying to simulate a rocket launch. Let's say all the forces on the rocket are applied at its center of mass. Let's say the center of mass of the rocket is currently at point named P1. Let's say ...
12
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1answer
2k views

How can a rocket go straight up after ignition? [duplicate]

We have seen during rocket launches that the rocket goes straight up after the launch clamps have disconnected. What ensures that it doesn't tilt because of the uneven mass distribution? How does a ...
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0answers
72 views

Exhaust plume length variation across different rocket types

In rockets we see exhaust plume smaller and bigger. I know length has some relation with the fuel mixture ratio (not confident about it). How to calculate, or at least understand, the variation in ...
3
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1answer
100 views

Temperature and pressure of rocket exhaust

What is the temperature and pressure of the exhaust that comes out of the rocket during the last three seconds of countdown (smoke that stays near ground)? How much carbon dioxide is there in that ...
11
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2answers
129 views

How does a water based acoustic suppression system work?

Now a days every rocket launch (except Russian or cliff hanging launch) happens using water acoustic suppression system. How does the water based acoustic suppression works? What is the water ...
2
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1answer
64 views

Nature of Sabre pre-cooler deminstration test

Inspired by a comment to this question "How does the Sabre engine's pre-cooler achieve such high performance?": the comment was that Reaction Engines have demonstrated that the pre-cooler works on ...
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0answers
117 views

What would be the implications of high-altitude or catapult launch for orbital rocket?

There are lots of questions on here which ask "Why aren't rockets launched from railguns/mountains/balloons/etc." and lots of nice answers mainly dealing with the practical difficulties of doing so, ...
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1answer
75 views

Filling the propellants in the rocket tanks

After putting the rocket on the launch pad the propellants are filled. But before that how to maintain the lower temperatures of the tanks so that when filling the propellants don't boil off?
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0answers
64 views

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
125 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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0answers
97 views

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
134 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
1k 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 ...
3
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1answer
119 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
67 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 ...
4
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1answer
115 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 ...
0
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1answer
160 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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0answers
25 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
3k views

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
1k views

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 ...
5
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1answer
456 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?