Linked Questions

2
votes
1answer
489 views

What is the aspect ratio of a wing? [duplicate]

I've been trying to get my head around wing design and have been following a few YouTube videos. When people talk about aspect ratio (AR) on a wing and give a value (Piper PA28 having an AR of 5.7) ...
1
vote
1answer
182 views

Is there a rule of thumb for aircraft design? [duplicate]

I'm wondering how to best scratch build an rc aircraft and what rough proportions the aircraft should be in. I'm aware of the fineness ratio that determines the width to length ratio of a cross ...
2
votes
1answer
191 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 ...
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?
0
votes
0answers
37 views

Wing Shape: Long/Wide Span Wings vs Deep Wings [duplicate]

Planes use wings to generate lift. The wider the span of the wing (looking at the plane from the front) the more lift it generates, however, this is at the expense of more drag. Some planes like the ...
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.
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 ...
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 ...
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?
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
2
votes
2answers
632 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. ...
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 ...
1
vote
2answers
1k views

How does wing aspect ratio influence lift and drag?

I know simmilar questions are all over the internet (and this website too), but there's one thing that i just cannot comprehend and none of the articles i read could explain it properly. According to ...
1
vote
4answers
218 views

Explained intuitively, why does aspect ratio affect induced drag?

Over the last few hours, I've been trying to intuitively understand induced drag, and how aspect ratio affects it. I already know the equations, but while they explain the relationship, they do not ...
0
votes
4answers
227 views

Why should I not use a “lifting tail” on my ultralight design?

In my misspent youth I designed and built many rubber, gas, and RC models. When I wanted good climb and glide I used a aft CG [60 to 80%] and a lifting tail. I had no stability or control problems, ...
4
votes
1answer
289 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, ...
0
votes
1answer
636 views

Do wingtip vortices cause a decrease in the lift component of aerodynamic force, and do planes need to pull more AoA to compensate?

So, from what I know about wingtip vortices, they shift the angle of the relative airflow to where the effective angle of attack of the airfoil is lowered. Since the aerodynamic force is always ...
1
vote
2answers
216 views

For jetliners, how is a swept wing justified over a thin wing?

For a given speed, a swept wing is a fatter alternative to a straight, thin wing. But why? Does not the sweep lengthen the wing and make it heavier? Is the swept wing chosen for the extra fuel tank ...
1
vote
2answers
156 views

For subsonic aircraft, would adopting a higher wing loading decrease drag?

First, let's assume that problems with approach/TO speeds can be fixed by high-lift devices. Here we read that the wings create more drag than the fuselage. So, an improvement seems obvious; shrink ...
1
vote
1answer
104 views

How do you calculate the optimal cruising speed of an airfoil?

I am working on a school project (aircraft design). I would like to know how to calculate the cruising speed of a given airfoil. For example, if I have a NACA 5613-35 airfoil (that is the NACA 4 digit ...
0
votes
0answers
31 views

Will wingtip drag always be more for a smaller aircraft, keeping constant aspect ratio? [duplicate]

Sometime ago, I came across an article (I couldn't find it) which stated that wingtip drag was only related to absolute wingspan. That is, for the same wingspan and lift force, varying the chord will ...