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Questions tagged [rockets]

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

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Are ion/plasma thrusters sufficient for propulsion from Earth? [closed]

I'm looking to make something like a jet pack and I'm looking for super cheap thrusters to carry humans than normal chemical oxidized ones that are used in spacecrafts. I read that ionic thrusters can'...
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368 views

Why is ethylene (ethene) not considered as a rocket fuel

In an answer to this question, the brilliant diagram below was given: The chart makes chilled ethylene look like a very appealing choice, yet I don't believe it is ever used. Why not? Edit: I just ...
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1answer
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Curves on Isp/density chart, what varies along each curve?

In an answer to this question, the brilliant diagram below was given: Each fuel has a similarly shaped curve on the chart. What does that signify? what varies along the curve?
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1answer
336 views

Which rockets have their upper stages separating at(around) 100 km?

Are there any current rocket systems that go to the Karman line with just 1 stage without boosters? Recent Rockets like the Falcon 9 separate at 80 km. New Shepard launches recently touched 100 km ...
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1answer
111 views

How far has Artificial Intelligence (AI) came in satellites? [closed]

Are AIs being used in satellites? If yes, have they learned to adapt in satellites? In what way AI has benefited space exploration for us?
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Liquid propellant stored as solid

Some propellants have wildly different melting points. The most extreme case is the theoretically fantastic (and nightmarish in practice) Fluorine-Lithium-Hydrogen tripropellant, with liquid hydrogen ...
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1answer
206 views

Density of propylene when used as rocket fuel, and advantages (if any) over RP-1?

Recently Vector space from USA has said that propylene is a better choice of fuel than RP-1. See Ars Technica's After a decade of testing, propylene rocket fuel may be ready for prime time Why is ...
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1answer
71 views

Effects of atmospheric conditions on rocket performance?

Do atmospheric conditions including (but not limited to) temperature and barometric pressure and humidity play role in rocket performance? While weather has a strong impact on decision to launch, I'...
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266 views

What happens to rocket stages that land in the oceans, and how many are still there?

When a rocket stage is jettisoned into the ocean, does it typically sink? Assuming yes, how many rocket stages are now lying on the ocean floor? Are there, on the ocean floor, areas where there ...
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What kind of Visual Sensors are employed aboard Rockets?

Cameras are the most common form of visual sensors and I usually see one strapped on the side of the stages as well as inside the separation module to show the separation of the rocket stages. What ...
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2answers
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What are the advantages of separating a stage few seconds after its burn out?

Will separating a stage(first) immediately after its burnout cause damage to the upcoming stage (2nd stage).? Also,do the first stage separation and second stage ignition happen at the same instant ??...
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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 @...
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1answer
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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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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
147 views

Could a gyrojet firearm 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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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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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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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 ...
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1answer
319 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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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
946 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?
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149 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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190 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
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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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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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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 ...
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1answer
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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
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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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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 ...
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1answer
186 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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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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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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286 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
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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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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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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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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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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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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 ...
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1answer
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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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118 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 ...
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1answer
352 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 ...
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225 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 ...
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1answer
85 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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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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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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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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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 ...