# Questions tagged [aerodynamics]

A subset of the [fluid-dynamics] tag concerning primarily forces such as lift and drag generated on bodies as they move through gasses or as gasses move through the body (typically air).

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### How to calculate the positioning angle of a rocket for launch

I am building a model rocket. I want it to end up in a specific position. If I am taking into account the acceleration, starting position, end position, mass, and wind speed, how do I find the angle I ...
2answers
1k views

### Variables in calculation of drag coefficient

Okay, so I looked up drag force equation, and I found that the equation involved the drag coefficient. Then I looked up the drag coefficient, and the equation for it involved the drag force. ...
1answer
116 views

### Angle of Attack of a propeller blade

What will be the best angle of Attack for a propeller blade that is in the airfoil shape?
4answers
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### Why does fluid pressure decrease as fluid velocity increases according to Bernoulli's principle?

I’m studying aerodynamics. I understand Bernoulli’s principle very well, I just can't wrap my head around why pressure decreases as velocity increases. Like the garden hose example: if you cover the ...
0answers
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### How can I control the airflow in a car by open or closed window configuration?

What car window configuration will let air in by me and make / let it exit away from me. I have a large divider between front and back seats that covers much, but not all the plane between. People in ...
2answers
135 views

### Will the hose eventually become a straight hose? [closed]

A garden hose on the ground, water with enough speed flows out at its end. In the beginning, the hose is bent. Assuming only the force caused by bending and the friction force on the ground act on the ...
2answers
81 views

### Why does the airflow at the leading edge of the wing curve toward the trailing edge of the wing?

Why does the airflow at the leading edge of the wing curve toward the trailing edge of the wing? Is it because the leading edge of the wing generates high pressure? High pressure pushes the air from ...
1answer
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### Is there a roof pitch angle for a hip roof that is most likely to withstand strong winds?

All other things being equal, what roof pitch (angle from horizontal) for a hip roof is likely to experience the least lift (or other relevant forces) and best withstand strong winds? Any of the ...
1answer
40 views

### How does a bullet achieve its stability when fired?

As far as I know, darts, arrows, and airplanes have the center of gravity(CG) ahead of their center of pressure(CP) and often have fins at the rear to achieve stability. Contrary to these, bullets ...
1answer
33 views

### Vortex formation in an airfoil

How is a starting vortex formed when an airfoil (i.e cross-section of wings of a plane) starts to move?
0answers
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### What is a formal proof for Kutta-Joukowski Theorem in compressible flow?

Texts, such as Drela, Flight Vehicle Aerodynamics, indicate that the Kutta-Joukowski Theorem holds in compressible flow. Indeed, the KJT seems hold in linearized supersonic flow around a 2D flat plate....
1answer
405 views

### How can I derive the stress tensor for a Newtonian fluid in more physical terms?

The question is quite fundamental and more on a beginner's level (not sure if good in this high-level-forum, but I try): I have big problems in understanding the stress tensor for Newtonian fluids in ...
0answers
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### Calculating (transient) rate of cycles of practical thermodynamic engines (turbojet, multi-cylinder car engines etc..)

I tried to make a plan for a turbojet engine with my physics knowledge and I'm stumped in the first step. For any sustained real engine, I need to somehow take a fraction of the energy output and use ...
1answer
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### Explaining Bernoulli's Principle

I'm trying to explain Bernoulli's principle (in the context of flight) to an audience that doesn't have a physics background. So I'd like to avoid mentioning technical concepts as much as possible. ...