All Questions
Tagged with aerospace-engineering propulsion
14
questions
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39
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When something undergoes angular acceleration (like a bar) how does the distribution of forces look along the bar?
This is something kind of explained with propellers and turbine blades but I'd love some good explanations. Thank you!
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20
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How to estimate air velocity at turbine in turbojet?
I am designing a small turbojet. I wanted to know how to calculate the air volume expansion to predict the outlet velocity of air towards the turbine. Theoretically, I wouldn't know the flame ...
-1
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1
answer
129
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Angle of attack on variable pitch propeller?
For a variable pitch propeller where the angle of attack can be adjusted during flight, are the individual blades similar in design to standard propellers, with a low angle of attack at the edge of ...
- 3
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1
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233
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Predicting thrust of a Motor
I want to be able to predict the load a single motor and propeller can carry, so I can choose an appropriately sized propeller and powerful enough motor.
I say predict because I'm first going to ...
- 5
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1
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187
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Multiple vs single rocket engine nozzles [closed]
I am an aeronautical engineering student and at university with a group of friends we are are working on building a rocket aimed at getting past the Karman Line (boundary to space).
We will be ...
- 3
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2
answers
282
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Amount of thrust needed to Hover on the moon?
I am interested in knowing how many newton's of force is needed to keep 1 kg of mass hovering above the moon's surface.
And whether the current most powerful ion thrusters would be up to the task? I ...
0
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0
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86
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Method of Characteristics nozzle - outputs area ratio?
I am designing a rocket engine as my final project at college, and I tried using a MatLab code developed by youtuber JoshTheEngineer. However, after running the code, it seems that the output points ...
- 1
0
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1
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195
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Why there are no jets (missile or aircraft) faster than Mach 3.3?
Fastest plane ever built: SR-71 ,Max Speed: 3.3 Mach , Development - 1950s
Fastest drone ever built: Lockheed-D21 ,Max Speed: 3.3 Mach, Development -1960s
Fastest cruise missile ever built: Brahmos ,...
- 187
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2
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449
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Is there an ideal propeller shape?
Are there theories that assert about the ideal shape (i.e., ignoring structural constraints) of a propeller?
Just looking at the shapes that emerge in practice, it appears that both the fluid speed ...
- 1,757
5
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1
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147
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Why don't propeller designers use multiple profiles?
I'm designing a ducted fan, and I'm deciding on the airfoil profile. NACA 16-series profiles are well-suited to M > .5 or .6, but they're not particularly efficient at lower Mach numbers. On the other ...
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2
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2
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8k
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What is the difference between shaft power and brake power?
I know little about internal combustion engines and I feel a little confused about brake and shaft powers. I read a book that only talks about shaft power, and other that only talks about brake power, ...
- 143
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Development of an interstellar mission: should I design the propulsion system or the main hull of the ship first?
I am currently developing an interstellar mission for a school project. I am thinking whether to design the propulsion system (Bussard scoop) or the main hull and structure of the spaceship first. ...
1
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1
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294
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How to calculate propulsive force of gas ejection
How can I calculate the propulsive force produced by ejection of a gas? I suppose it depends on the gas, the velocity with which it ejects, the amount of gas, and some other parameters, like the ...
- 313
10
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3
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Could air-launched space planes reach escape velocities?
Rockets like the Ariane 5 weigh hundreds of tons, but with about 85% of that weight being fuel, the payload fraction is only about 3% (~10-20 tons).
Virgin Galactic is building suborbital space ...
