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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150 views

What organizations correspond to the logos on this ORBITEC Vortex engine rocket?

Images are from the 2012 New Atlas article ORBITEC flight tests new vortex liquid fuel rocket engine. One looks a bit like a US military or DoD logo, one perhaps is ATK, but I'm not sure. Is this ...
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How to experimentally determine the degree of atomization of the propellants mixing in a fuel injector?

When validating a fuel injector design on a test stand using liquid water to simulate a liquid-liquid fuel injector(the one i'm working with currently is a pintle design but I suppose one could ...
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1answer
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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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Flight characteristics of a three-passenger rocket with a range of up to 500 miles (800 km)?

If I could bring two of my best friends to a spaceport and take a rapid trip to a city hundreds of kilometers away (think half an hour to cross a continent), what would would be the vehicle's flight ...
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4answers
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Why do pump and pressure fed liquid engines need to operate at high pressures?

There is apparently some confusion as to why pump or pressure fed liquid rocket engines need to operate at high pressure to product significant thrust, based on the comments to this question about ...
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3answers
432 views

How could we make a fair comparison between space rockets regarding their payload mass in low Earth orbit and Earth escaping?

I was searching for comparisons between space rockets regarding their payload mass in low Earth orbit and Earth escaping. First one to see capability of the space booster (the first stages) and second ...
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2answers
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Briefly, what are the factors to consider when choosing a launch site?

What some factors to consider when they choose launch sites like Cape Canaveral or Baikonur Cosmodrome? Is it possible to have a launch site anywhere in the world (if so why does the ESA launch its ...
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1answer
287 views

Contracting rocket engine nozzles

The efficiency of rocket engine nozzles depends greatly on their expansion ratio an how well the ambient pressure matches the rocket nozzles exit pressure. An optimal expansion ratio means that there ...
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Low-pressure pump-fed rocket engine?

I saw the above suggested in LEO on the Cheap. In P.130 it says: A compromise between high-performance/lightweight pump-fed vehicle designs and cost-optimized pressure-fed vehicles with heavier ...
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4answers
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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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4answers
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Alternative to GPS navigation for vertical landing, especially on other planets

Is the GPS data reliable or meaningful only on Earth or below the geo-stationary Earth orbit? For GPS navigation, does a rocket has to fly below the geo-stationary orbit? If GEO is a physical ...
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Do lower pressure pressure-fed rockets get more Delta-V?

I was playing around with the math for getting a pressure-fed rocket to orbit and came across something that I haven't seen addressed anywhere. In a pressure-fed rocket, the chamber pressure of the ...
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Why do rocket nozzles flare?

Why do rocket nozzles open wider at the end than, let's say, get narrower? Let me explain: A jet engine works by having this amazing thing called a combustion chamber. The combustion chamber ignites ...
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2answers
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Trying to make a program to calculate (liquid) engine size. Can you please help me check for any problems?

So as the title says I am trying to write code to calculate engine size and some other parameters. For the equations, I used mostly : Sutton's Rocket Propulsion Elements 8th Edition, and for the ...
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How much cheaper are pressure fed engines compared to other cycles (e.g. staged combustion, gas generator, electric pump-fed)?

It's well known that pressure fed engines are mechanically simpler, and therefore cheaper than pump-fed cycles (although pressure fed has worse performance). However, I haven't found any sources that ...
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Did anyone ever launch a rocket, filmed by another rocket in mid air?

I recently analyzed some SpaceX launch footage (a Starlink deployment on September 3). I noticed a switch in camera perspective at T+00:02:20: from cameras on the ground to those attached to the ...
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Do the SpaceX Falcon-9 rockets use foam insulation similar to the Space Shuttle? Is it still a potential problem?

The Space Shuttle used polyurethane and polyisocyanurate foams for insulation. A chunk of foam breaking off during launch resulted in the Space Shuttle Columbia disaster. Do all chemically-fueled ...
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7answers
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The Martian: Does it really take a supercomputer to calculate spaceflight maneuvers?

My preemptive apologies for asking a question about a movie, and the spoilers within said question, but considering the widespread support for its scientific plausibility, I'm hoping you'll let it ...
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1answer
121 views

How much anti-matter is needed for an anti-matter propelled rocket to reach $P$ % ($P\lt{100}$) of the speed of light (c)?

I think this is a tough one. Imagine a rocket is produced which is propelled by a matter-anti-matter device. Its sole purpose is to reach high velocity. Which means the mass can be kept low, say $m$ ...
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1answer
141 views

Dispose Earth's nuclear wastes towards the sun [duplicate]

If rockets are reliable, can we throw our nuclear wastes towards the sun? The sun's gravity and it's internal energy will do the rest.
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1answer
102 views

Why not bring a rocket to idle velocity for less violent and safer re-entry? [duplicate]

Since kinetic energy have to be converted into heat during re-entry, the re-entry into the earth's atmosphere seems very violent. Why most rockets or crew re-entry modules plunge into the earth's ...
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2answers
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How much more cost efficent are SRB's over the main engine?

Why use SRBs instead of a simpler rocket design that dispenses with SRB's and instead has a bigger main engine? The Saturn V escaped earth's gravity just fine without boosters. Since then though SRBs ...
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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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3answers
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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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0answers
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How does a rocket go from gravity turn to orbit?

A rocket launch normally begins with a roll to align with the orbital plane and a pitch to allow gravity to gradually torque the rocket down as it climbs. The combined roll and pitchover maneuver last ...
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2answers
7k views

Optimal speed per altitude for orbit launch

On Kerbin, rockets have an optimal speed depending on altitude for maximum fuel efficiency, as You can save fuel by being close to your terminal velocity during ascent. Lower velocity wastes delta-...
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1answer
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Source of Gregorek's popular drag equation in ESTES TR-11?

In the early 1970s, Gerald Gregorek wrote a technical note on drag for ESTES (maker of model rockets and parts from what I gather). The note is still very popular in the model rocket community, and it ...
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81 views

Did any rockets have 5- or 7-fold symmetry?

Have any rockets ever been made with fivefold or sevenfold symmetry? Five or seven (or larger prime numbers, or multiples thereof) identical engines or boosters equally spaced around the center. (...
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Roll Maneuver in SpaceX Demo-2 Launch?

I couldn't see a roll maneuver early in the launch of the demo-2 mission, and this left me wondering if SpaceX skipped the maneuver. Would they do the pitchover without roll? Also, I've noticed in one ...
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SpaceX Dragon Shape: Power Series, Ellipsoid, or Haack/Von Karman?

The SpaceX Dragon module has a round apex typical of power series, ellipsoid, and Haack/Von Karman shapes. I'm wondering which of these SpaceX actually used. References would be appreciated. My guess ...
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1answer
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What is the difference between the Vulcan 562 configuration and the Vulcan 5H2 (“Heavy”) configuration?

I was looking up some information about ULA's Vulcan rocket, and noticed something odd. There are two configurations, Vulcan 5H2 and 562 that have the same number of boosters, the same size of tanks, ...
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1answer
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What exactly is the purpose of connection links strapped between the rocket and the launch pad

I am curious on what are those multiple connection cables latched between the rocket and launch pad. What exactly is the purpose of it, I am aware that one should be for filling up the fuel. But ...
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1answer
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I don't know where to start with the calculations - rocket engine

Last year I stumbled upon the "How to design, build and test a rocket engine" pdf and since then I have been intrigued by making one (or at least calculating it). So I've been doing some ...
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0answers
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Rocket Engine - Actuator in Loop Simulations

For Actuator-In-Loop simulations, why are the rocket engine nozzles along with the thrust vector control assembly (including the actuators) kept inverted on a platform like in the attached image or as ...
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2answers
529 views

How does spin stabilization intuitively work?

I am not very familiar with physics or rocketry and I am having a lot of difficulty grasping why spinning a rocket or satellite stabilizes it. Most sources I have looked at have said either that it ...
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0answers
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Need help finding a clean expression for exit velocity [duplicate]

I'm trying to calculate a engine burning LOX and ethanol (96%) and for that I am using both CEAgui, a GUI for NASA's CEA (Chemical Equilibrium with Applications) code Sutton's Rocket Propulsion ...
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3answers
791 views

Getting back from the Moon

This link describes the way back from the Moon surface to the orbiting spacecraft. But how could that spacecraft get back to the Earth? It is a long journey. How much rocket fuel would be needed, in ...
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1answer
79 views

Efficiency of rocket stages and converging/diverging nozzle

It is a fact (to the best of my knowledge) that for optimum thrust from a rocket engine, one of the most important factor is the design of its converging/diverging Nozzle - the diverging cone to be ...
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2answers
167 views

Did rockets use turbopumps prior to the V-2?

Did the liquid propellant rockets before V-2 use turbopumps or were their fuel tanks pressurized with gas? Or perhaps were their engines gravity-fed?
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3answers
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Why was the Delta Clipper cancelled?

Delta Clipper (McDonnell Douglas DC-X) achieved vertical landing two decades before Falcon 9. And its cost was very small - 60 million dollars. Why was such an awesome Rocket cancelled? How is NASA ...
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1answer
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Will the Mars 2020 rocket be visible in the night sky?

When a Space X rocket was launched towards the ISS this year, the rocket could be seen in the night sky in Europe. The information as to where and when to look in the sky was even easily available ...
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3answers
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Why do some rockets not ignite all their engines during liftoff? (GSLV MK3 LV)

As I understand it, a rocket should produce its maximum thrust on liftoff. As time progresses, the mass of the rocket will decrease, but since the engines produce the same thrust, the rocket will ...
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1answer
91 views

how does the open expander cycle seperate the fuel for the pump and combustion chamber

I'm designing a single open cycle expander rocket engine using propane. However, I've been unable to find out whether or not the fuel is split into the turbine and combustion chamber before or after ...
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1answer
87 views

Rocket staging by use of strap on Boosters

Will it be advantageous to have multiple (say-3) stages of a rocket, arranged in a "strap-on" type SRBs' assembly, geometrically well distributed around the circumference w.r.t. their ...
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1answer
174 views

Fat as hydrocarbon rocket fuel?

Have fat/grease or fatty acids ever been studied as a liquid rocket fuel? (I don't expect it to be a good rocket fuel, but I wonder if anybody has ever burned it in an engine or made a serious study ...
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2answers
234 views

What to do with money?

Suppose I raise $10 million from venture capitalists for my rocket startup, what are the initial steps I must take (as a person with no experience of making rockets before) to ensure my companies ...
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774 views

Why are spin-stabilized rockets stable?

Spinning rigid bodies are stable about their axes of smallest and largest moments of inertia. When there are energy dissipation modes, such as bending and propellant slosh, only the largest moment of ...
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Can Chemical Engineer work on something related to space?

I am an undergraduate student (scientific section) living in Qatar. I have a big interest in astronomy and astrophysics and have participated in the IOAA (International Olympiad on Astronomy and ...
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Design of propellant tanks of a rocket [duplicate]

I understand that the propellants (e.g. LOX & LH2) are stored in a rocket tank which is pressurized by Helium or a neutral gas, so as to push the propellants towards the tank outlet, to the turbo-...
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3answers
296 views

Do air augmented rocket give increased thrust over simple rockets from the very starting of the engine?

Augmented rockets increase thrust (about twice) by mixing the exhaust of a rocket with ambient air in order to accelerate a greater mass of gas at a lower speed. Is the effectivness of this system ...

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