Linked Questions

24
votes
3answers
6k views

Could airliners' wings be thinner if no fuel were stored in them?

I ask this question because wings are pretty thin overall, but I am curious if you could make them more thin.
19
votes
2answers
22k views

How does chord length affect wing design?

In comments on the answer to a question about transonic speeds and control surfaces I came across this comment and I'm having a hard time understanding it. If you increase the chord, lift goes up ...
11
votes
2answers
27k views

How does the raked wingtip of the Boeing 787 work?

The wing tips are very different on these airplanes. The wingtip on a Boeing 787 is a sharp triangle, while the wingtip on a Boeing 737-300 is flat. British Airways Boeing 787-8 G-ZBJC wingtip | by ...
10
votes
2answers
3k views

What is the aerodynamic benefit of trailing edge sweep?

I know that the sweep will allow the flight to fly at higher speed because the perpendicular air flow speed (over wing) is less. But I didn't understand why there is trailing edge sweep? We can ...
10
votes
2answers
52k views

What are the advantages and disadvantages of a delta wing compared to a swept wing?

What advantage does a delta wing have over a swept wing with high AR for supersonic flight? And what disadvantage does a delta wing have over a swept wing with high AR for transonic flight? The ...
9
votes
4answers
2k views

Why do we use dimensionless expressions in flight mechanics and aerodynamics?

Why do we use non-dimensional expressions in flight mechanics and aerodynamics? We could as well directly calculate forces and moments; would that not be more relevant to the specific problem?
6
votes
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 ...
6
votes
3answers
533 views

Why don't solar powered aircraft use wings with more surface area

I was looking at some solar aviation projects, and I noticed they appear to follow the designs of a glider. The Helios drone above is basically a flying wing with a high aspect ratio. And the solar ...
6
votes
1answer
1k views

How to determine climb performance for various flight speeds?

I have the following climb performance chart: and I need to evaluate the maximum rate of climb in different flight conditions. The problem is, this chart is valid only for 85KIAS. Is there a way to ...
5
votes
3answers
2k views

Is the induced drag independent of wing span?

I am a new aviation student and I was reading about induced drag the other day. I know that it is produced as a result of the tip vortices and that the greater the aspect ratio of an airplane the less ...
5
votes
1answer
1k views

Does skin friction drag decrease with velocity?

The wings of subsonic planes have usually a very low surface area and aspect ratio as big as possible. However, in supersonic aircraft, wings with more wetted area (e.g delta wings) are used. Is this ...
4
votes
1answer
288 views

How can a designer maximize the glide ratio of an aircraft with low aspect ratio wings, other than by increasing the aspect ratio?

As I understand it, the gliding range is given by a lift to drag ratio—hence to increase the gliding range, I would want to increase the lift and reduce the drag as much as possible. To that end, ...
2
votes
2answers
630 views

Elliptical wing planform and elliptical lift distribution

I know that there are similar topics already here, but after reading them I still do not understand everything. From what I know elliptical lift distribution gives the least amount of induced drag. ...
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?
2
votes
1answer
190 views

Relationship between wing aspect ratio and speed [duplicate]

For some reason, I cannot find a relatively straightforward source online which discusses the relationship of wing aspect ratio and how it affects speeds of an aircraft. Specifically, is there a ...

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