Linked Questions

0 votes
1 answer
92 views

How do the vortex created by wing tips affects the lift? [duplicate]

I’ve been reading about how improve the aircraft performance and I found that for low aspect ratios, the vortex created by the wing tips decrease the lift generated by the wings. Why is this happening?...
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  • 127
50 votes
8 answers
13k views

How complete is our understanding of lift?

I'm currently studying for my PPL and one of the accepted textbooks contains the following disclaimer at the end of the Principles of Flight section on lift: It is important to note that the forgoing ...
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  • 8,850
32 votes
2 answers
9k views

Why doesn't the Concorde have any wing fences?

A Wing Fence is a straight, vertical "fence" running from forwards to backwards down the wing. This MiG-17 has three fences per wing. I've also seen them on delta-winged aircraft such as the MiG-25. ...
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  • 17.1k
20 votes
3 answers
29k views

What is the purpose of a dorsal fin such as on the Boeing 737?

I've noticed that the 737 has a rather unusual vertical stabilizer, with an extension at the front. Is the 737 the only plane equipped with such a vertical stabilizer, and what is its purpose?
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26 votes
2 answers
10k views

What is the purpose of the small fins on top of the wing surface of Boeing aircraft?

I've noticed on most Boeing aircraft that there are small fins on the upper surface of many of their wings. They are about one inch high and maybe two inches long (it's difficult to judge size from ...
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  • 1,634
29 votes
2 answers
11k views

Why didn't the Concorde have flaps or slats?

It's well known that the Concorde had no flaps or slats. The lack of high-lift devices considerably reduced lift at low speeds, requiring the Concorde to take off and land at higher speeds and angles ...
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  • 26.2k
17 votes
3 answers
27k views

Why are delta wings not commonly used in commercial airliners?

Delta wings are most commonly seen on military aircraft. I understand that delta wings are ideal for supersonic flight, and provide high maneuverability. Having high maneuverability and speed are ...
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  • 1,071
12 votes
3 answers
6k views

What advantages come with the wing on the Boeing Bird of Prey?

I noticed this picture yesterday of the Bird of Prey and wondered about the wing design and what advantages would come with this unique wing design compared to other aircraft? Source:(www.wired.com)
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  • 9,175
10 votes
5 answers
5k views

Why doesn't the A320 have a dorsal fin like the 737?

The A320 doesn't have a dorsal fin, but the 737 does. If the 737 is more or less a similar aircraft, why doesn't the A320 have a similar dorsal fin? By Bill Larkins [CC BY-SA 2.0], via Wikimedia ...
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  • 11.2k
15 votes
3 answers
4k views

What are the disadvantages of a delta wing biplane design?

The idea of a delta wing as I understand it is to reduce stress on the wing and drag on the leading edge. Now using two delta wings on separate planes, on one frame would presumably allow for a ...
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  • 657
6 votes
3 answers
23k views

What is the typical angle of attack aircraft fly at and at what angle of attack do they stall?

At what angles of attack do aircraft typically fly at? How much of a margin is there before aircraft stall due to an increase of an angle attack due to factors such as gusts or rotation of the wing ...
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7 votes
3 answers
3k views

How does the use of Leading Edge Root Extension help in increasing stall angle?

Leading Edge Root Extensions were first used in Northrop F-5A/B Freedom Fighter, which first flew in 1959. After that, many fighter air-crafts have used it, some of which are mentioned after the ...
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12 votes
2 answers
63k 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 ...
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10 votes
2 answers
7k views

What are the benefits of a 'cranked arrow' delta wing?

What are the benefits of the 'cranked arrow' delta wing that was used on the variant of the F-16, the F-16XL? Sourceenter link description here
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  • 3,506
12 votes
1 answer
2k views

What is the difference between side-by-side vs under-cockpit engine intakes?

What is the main difference between these two engine configurations? What are the differences between planes that have the intakes below the cockpit as compared to those who have them on the sides? ...
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