Linked Questions

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0answers
70 views

Induced drag - inverse proportion between induced drag and parasitic drag [duplicate]

I recently learned that the slower an aircraft is traveling, the higher the induced drag and the lower the parasitic drag. The parasitic drag is lower because the particles have less force against the ...
-1
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1answer
49 views

What is the difference between interference drag and form drag? [duplicate]

What are the differences between interference drag and form drag? And which factors affect them?
15
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6answers
3k views

Is lift in fact a kind of drag?

Given the similarities between Lift and drag and their very similar relationships to the density, surface area, and airflow velocity, could one, in theory, describe aerodynamic lift as a kind of drag ...
9
votes
4answers
11k views

What determines the best glide speed?

I found the best glide speed of cessna 152 is 60 kts. My question is why it is not more or less than 60 kts? What are the factors upon which the best gliding speed is determined?
9
votes
5answers
2k views

Why do wall-to-wall airfoils in wind tunnels produce no (or infinitesimal) downwash?

There are several induced drag explanations out there saying that tip/wake vortices “come from” downwash and downwash “comes from” lift. I’m using quotes because the concept is that there are no cause ...
5
votes
4answers
2k views

Can this design provide more lift force than thrust from engine?

The problem is depicted in the picture: Generally, why we don't use engine blow wings to fly? Can we use wind-tunnel-like wing to generate lift force? Can it generate more lift than thrust? If it ...
5
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3answers
3k views

How is drag created from wingtip vortices?

What is the reason for the drag due to wingtip vortices? This question is about (general) performance, but doesn't answer the drag aspect.
6
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2answers
3k views

Why is induced drag less on a high span wing?

I have a basic question and sorry if it is a well known fact. I understand that the induced drag is due to the tip vortices changing the effective angle of attack (downwash). I searched some ...
7
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3answers
2k views

Is induced drag caused because of the tilt of the wing backwards?

In this question: Why is induced drag less on a high span wing? In the answer it was stated that wing tip vortices do not cause induced drag. If this is the case then what causes the induced drag. ...
6
votes
1answer
2k views

How would an airfoil react if it was flown backwards?

Out of curiosity what would happen? Would pressure on both top and bottom flip? or stay the same or act as a normal wing with less lift? I'd assume it would still take longer to travel over the top ...
8
votes
1answer
1k views

Is induced drag not caused by tip vortices?

According to most online resources, including NASA, induced drag is caused by wingtip vortices which induce downwash. However, in StackExchange I have found a few answers (Peter's and Jan's) that ...
3
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1answer
2k views

How does downwash change relative wind? [duplicate]

I have a question regarding the production mechanism of induced drag. I understand the downwash aft of the trailing edge (steaming from wingtip vortices) causes the induced drag by changing the ...
4
votes
1answer
961 views

Does the Airfoil Tools Cd/Alpha Curve include both induced and parasite drag?

I'm looking at Cd / Alpha for the SD7062 Profile: http://airfoiltools.com/airfoil/details?airfoil=sd7062-il Wondering if it includes both induced and parasite drag. How does one tell?
2
votes
0answers
86 views

Relation between drag and aspect ratio [duplicate]

How does increasing the aspect ratio decrease the drag over the wings? Wouldn't the various types of drag affect over the wings in proportion to the increasing aspect ratio?