Questions tagged [rocketry]
35 questions
4
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1 answer
Can a water-pump pump diesel?
After some research, I found that diesel is my choice of fuel.
Now I need a way to pump it to the engine. My main constraint is price.
So my question is can I use a water pump like one of these, to pump the diesel?
Dat Ha
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3
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Why are rocket engines tested horizontally?
Rocket engine test stands mount horizontally. That's surprising to me given that rocket engines are meant to operate vertically. Doesn't gravity effect any part of the system? Valves, gas mixing, etc.
Chris Noe
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3
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2 answers
What is the purpose of building multistage rockets, rather then packing more fuel into a single stage?
Reading an article about multistage rockets (not educated at all on the topic), and from the get go it seems to assume they are used/need to be used.
david62225
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Are rocket engines practical for commercial aircraft?
What are the prospects of seeing rocket engines become the standard for commercial aircraft? It might be a dumb question; I really don't know all that much about the topic. The reason I ask is that rocket powered aircraft are much faster—and who…
bobKnowsBest3199
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2
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Combustion Chamber Back Pressure due to gas injection
I am trying to calculate prior to testing the expected back pressure resulting from injecting gaseous oxygen through an injector orifice (choked) into a rocket combustion chamber before ignition. I have tried using the Borda-Carnot equation with the…
Justin B.
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2 answers
Propane rocket nozzle material
As far as I know, propane with oxygen will burn at 2800 °C and steel will melt at ~1500 °C. Brass is even less.
What I am trying to do is a rocket nozzle.
Is there a way I can built this with steel or is it simply too hot? And for the burning…
Dat Ha
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How much would Jupiter heat up if you accelerate Jupiter out of orbit around the sun using fusion candles?
So, I responded to a post of someone saying that you could turn Jupiter into a spaceship using fusion candles. I mentioned that doing so would dramatically heat up the planet, especially if you were to accelerate it out of orbit of the sun over the…
SgtCupCake
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Rocket vs aeroplane? Difference in take off?
Although both aeroplane and rocket burn fule and eject smoke but
Why aeroplane moves and runs horizontally before take off ?why does not it takes off at its original/initial place just like rocket?
DSPCS
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Inefficiency of intermittent burn in rockets
Imagine I have a combustion chamber with a nozzle. There is a high pressure oxygen bottle and a high pressure gaseous fuel bottle connected to the chamber. Would the fuel efficiency be lower if I performed combustion in a series of many very short…
Francis L.
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How to minimize temperature increase caused by compression of a cryogenic liquid in a multistage high pressure turbopump?
The cryogenic fuel I'm using is methane at 100 K and 300,000 Pa.
Based on my calculations, after compression, the pressure is 55 MPa and using the ideal gas equation the temperature is approx. 800 K.
I need to keep the methane at a temperature of…
Matt01
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2 answers
the speed of the exhaust
This is from Stephen Hawking's latest book; Brief Answers to the Big Questions.
The speed at which we can send a rocket is governed by two things, the speed of the exhaust and the fraction of its mass that the rocket loses as it accelerates.
Harry
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What factors besides nozzle geometry and propellant's affect engine ISP? How can one optimize ISP?
In the design of a Rocket engines, it is understandably desirable to have a more efficient engine.
Ensuring the gasses coming out of the engine comes out straight, and the chemistry of the propellants are all straight forward methods of improving…
WhisperingShiba
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3 answers
Small oxygen tanks
Does anyone know of any type of small, refillable oxygen tank.
I'm trying to build a rocket and the smallest cylinder I could find is BernzOmatic's 1.4 oz. cylinder.
A big cylinder isn't really safe for my purpose and I really need it to be…
Dat Ha
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What are the limits on plane speed?
I was thinking about an extremely narrow object and considering that I think in the ideal case it could only deal with the force of collision with air particles at the front of the projectile (although I assume it would need fins to be stable).
At…
John Smith
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What is the best way to go about finding properties of stress like working stress and yield strength when the material is unknown?
Our group has been working to design a combustion chamber of a relatively small hybrid engine with a chamber pressure of 30 bars. We are currently faced with the problem that we cannot easily access materials from certified places that have the…
