Questions tagged [rocket]

For questions about rockets as they pertain to aviation. Questions about rockets in the context of space are off topic here.

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21
votes
1answer
5k views

What's wrong in this engine test cell picture from the book 'Ignition'?

This is picture taken from 'Ignition' book by John D Clarke. I am bewildered after seeing picture that I can't find wrong in this picture. I guess this is related to the structure of mach ...
0
votes
2answers
332 views

Does an engine that combines an air-breathing rocket and non-air-breathing rocket exist?

Does a rocket engine that combines air-breathing and non-air-breathing modes exist? The advantage would be it would have to carry a smaller tank and less oxygen, leaving more room for payload on a ...
3
votes
2answers
162 views

What is wrong with my understanding about total pressure for a rocket nozzle?

I’m using the ideal rocket equations and isentropic flow but cannot determine what is wrong in my understanding about total pressure. Can anyone explain where I am wrong using the following example? ...
3
votes
1answer
238 views

Would “Mad” Mike Hughes' steam-powered rocket have been certified airworthy by the FAA?

Daredevil 'Mad' Mike Hughes died after his homemade rocket crashed on 22 February 2020. The cause appears to be the premature deployment of the parachute used for a safe return. He was hoping to reach ...
5
votes
2answers
356 views

Credible Sport Project: Is it possible to revive the idea with modern avionics?

Synopsis: On a secret mission to rescue 52 hostages in Iran, Operation Credible Sport was created. The project consisted of a modified Lockheed C-130 Hercules and developed so that it would be able to ...
-2
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1answer
98 views

Rocket Thrust vs Air breathing jet engine why is a rocket better [duplicate]

What are design dynamics that give the rocket engine higher thrust than an air breathing jet engine of similar size in comparison to a turbo jet engine, turbo fan engine, high by pass turbo fan engine,...
0
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1answer
56 views

Are solid fuel rocket engines designed differently and how? [closed]

How do solid fuel (Hydrazine, UDMH) and oxidizer (N2O4) differ in design from cryogenic rocket engines such as LH2 and LOX? Are there differences related to temperature, material design, turbopumps, ...
2
votes
1answer
166 views

Why Apollo 11 was launched in summer? (Performance question) [closed]

The question could seems stupid, but i think that best moment to launch a rocket is when temperature is lowest in order to achieve the best performance in a reaction engine. I do not know if there is ...
3
votes
2answers
462 views

Could the Space Shuttle take off like an airplane?

This question got me thinking, would the Space Shuttle have been able to use its main engines to roll up to speed and take off horizontally like an airplane? (I'm not asking about getting to space, ...
2
votes
2answers
198 views

Why is the center of pressure of a rocket at its centroid?

From thin airfoil theory, at subsonic speeds, the center of pressure of any uncambered airfoil is at quarter chord. For sounding rockets, however, the center of pressure is generally assumed to be ...
5
votes
2answers
674 views

At what altitude does a wing become useless? [duplicate]

At what speed or altitude does an aircraft become more efficient as a rocket then a plane using thrust vectoring instead of the wings to steer? At what altitude did the flight control surfaces of the ...
0
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0answers
34 views

Effect of Turbulence on Dynamics

I am trying to make a simplified version of a model rocket in MATLAB's Simulink. I have modeled the actual dynamics already, and they work perfectly fine. The inputs to the dynamics are the forces and ...
1
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1answer
153 views

Are the nearby airplanes cleared of the sky when launching Falcon Heavy? [duplicate]

I was checking Flightradar24 when launch occurred and didn't see any difference. Also, 3 boosters landed back successfully. I assume the sky has to be clear of airplanes to avoid any potential ...
2
votes
1answer
233 views

Why are hexa airfoils used on rockets despite having more drag that diamond airfoils? [closed]

I was doing a study on airfoils shape for a rocket. I tested the diamond and the hexagonal airfoil with Missile DatCom, RasAero and the Shock Expansion theory and from my results it seems like the ...
-3
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1answer
162 views

How can ballistic techniques be used for civil passenger transport? [closed]

Going anywhere on the globe in half an hour, instead of up to 29 hours, is of course very appealing. How can ballistic technology be used for the purpose? Will cost be acceptable for average ...
0
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0answers
50 views

Are throttleable rocket engines the less efficient the lower the power setting?

Are throttleable rocket engines less efficient the lower the power setting? Logically that would lead to lower pressures in combustion chamber and so lower thermodynamic efficiency. Or is it remedied ...
3
votes
5answers
321 views

Can air to air refueling can be done in the rocket engines as done in the Aircraft jet engines?

Can air to air refuelling can be done with rocket engines as is done with conventional aircraft jet engines? If no then what are the possible hazards or conditions preventing this?
18
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5answers
4k views

Why was a Lockheed L-1011 chosen by Orbital ATK for its Pegasus launches?

Not sure whether this fits better here in Aviation, or would be better suited for Space, but since the question is about a terrestrial aircraft, I'll start it out here. The topic of my question is ...
3
votes
1answer
173 views

Are there any locations where I could launch a rockoon with minimal red tape?

I'm currently working on a research project on hypersonic control surfaces, and as part of it, I'd like to launch a rocket-assisted lifting body from a high-altitude balloon. Are there any locations ...
-1
votes
1answer
552 views

What is the theoretical maximum speed of a rocket-powered aircraft in the atmosphere?

I read that the scram jet has a theoretical maximum speed of Mach 24. What is the theoretical maximum speed of a rocket-powered aircraft designed to operate in the atmosphere?
3
votes
1answer
993 views

Would it be possible to build a “rocket” using a series of ducted fans?

I'm wondering if it would be possible to build ducted fan "rocket". My idea is to construct the duct from 18650 batteries, and to have a series of contra rotating fans along its length. I can 3d ...
16
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7answers
9k views

How do rocket engines produce more thrust than aircraft jet engines?

I can't find the reason why rockets are able to produce so much thrust when compared to turbojets. I do know that the rockets carry their own own supply of oxygen since there is no oxygen in space or ...