Questions tagged [wing]

For questions on an airplane's main wing

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3
votes
2answers
223 views

Pitch control of tailless aircraft/flying wings with very wide elevons

I'm writing a simulation of a flying wing and I need clarification on some of its behavior. Specifically, the simulation suggests to me that a flying wing (or any tailless aircraft) with two single ...
1
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3answers
184 views

How heavy are modern cantilever monoplane wings?

Aircraft need to reduce weight in order to reduce induced drag. The modern shallow cantilever beam wings carry a massive weight penalty, as most of the material is wasted inefficiency absorbing the ...
11
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4answers
2k views

Were leading edge ailerons tested?

So far I have never come across any testing being done on having the ailerons and/or elevators on the leading edge of a wing, rather than on the trailing edge. Does anyone know of such tests existing? ...
7
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1answer
176 views

What is that wing device that looks like a mini-spoiler on the CJ3?

The Cessna Citation CJ3 (model 525B) has that device circled below, what is it? Source: airplane-pictures.net I initially saw it as a mid-chord fixed spoiler-like device. As @programagor commented, ...
1
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1answer
66 views

What would be the Sref i.e. Reference Wing Area for Drag Build Up Calculation in case of a box wing design?

Would Sref be sum of areas of both, the front and the back wing? or just one wing? Assuming both the wings have equal areas (image below) Details - So, I am calculating drag using the component drag ...
8
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5answers
1k views

Can flaps be used to perform rotation and flare?

TL; DR using flaps to directly control sink/climb rate near ground = simpler and faster response = easy to fly airplane? Rotating is the pitch up during takeoff that causes the aircraft to leave the ...
5
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3answers
262 views

What purpose do wing root seals serve?

What is the use of wing root seals? What kind of leaks are possible without having wing root seals, and if the seal is broken what kind of issues can airplanes face?
2
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2answers
169 views

Swept back wing theory

I'm a beginner in airfoil design. I just came across swept-back wings. There is a point that I couldn't understand that theory. Why is the only perpendicular component of the airflow to the wing(...
0
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1answer
104 views

In wing design, how is factor of safety related to G-limits?

What does factor of safety mean with regard to the maximum G force an aircraft is rated for? Does a rating of 3Gs mean the same as a safety factor of 3? Or is there some extra margin?
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0answers
64 views

What characteristic my canard needs to have when the canard also carries a pair of engine?

I am in 3rd year Aerospace Engineering and trying to do a preliminary design of an airplane. My design has a front wing that also has an engine at its root on both side of the fuselage. There is ...
1
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2answers
204 views

What justifies a biplane over a braced monoplane?

Biplanes became the first airplanes to enter service due to their structurally efficient design being more suitable for the weak materials then. This efficiency comes from the two wings acting as the ...
2
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0answers
48 views

How do I find the shear center of an unsymmetrical airfoil?

I'm quite a newbie of these systems and I am designing the wing box of a drone. I know where I want my shear centre. However, I have been trying to determine the shear centre of my idealized airfoil. ...
9
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2answers
3k views

Why do the ailerons of this flying wing work oppositely compared to those of an airplane?

I made this simple wing glider and put some ailerons on it. I thought that the ailerons in this glider would work the same way it works on airplanes, wherein the roll will be in the direction of the ...
0
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1answer
63 views

How does one calculate the Mean Geometric Chord in extended Trapezoid Wing?

The general formula to calulate MGC of a wing is given for a trapezoid in many books but there isn't an example showing how to calculate it for a wing shaped like the one below. I tried to solve ...
0
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1answer
206 views

Would an airliner fly more efficiently on a fatter wing at a low altitude?

Flying at 1000 ft, would giving an airliner wing more girth but not length, allow the plane to fly more efficiently than it normally would at that height? Yes, airliners fly best around 35,000 ft, but ...
0
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0answers
45 views

Can boundary layer blowing increase transonic efficiency?

One of the problems faced by transonic aircraft is flow separation by recompression shock. Can the pressure drag that arises due to this flow separation be reduced by re-emerging the boundary layer ...
1
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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 ...
3
votes
1answer
86 views

Induced drag reduction from tandem wing

Induced drag is proportional to the square of span loading. The normal method to decrease it would be to increase span. This, however, leads to an exponential weight increase. So, my question is, if ...
0
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0answers
63 views

Aircraft wing stress design for 4 engine aircraft

Can anyone tell me how aircraft wings are designed for mounting the engines. My area of self study is a typical engine on the A380 weighs 8000kgs and it’s weight is forward of the wing. As the wing ...
1
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1answer
61 views

Difference in lift generation for a swept wing and straight wing in subsonic condition

Would there be any differences in lift for a straight wing and swept wing (front or back) with the same airfoil cross section, same chord length, same wing span, and same area when flying in subsonic ...
2
votes
1answer
86 views

What counts as the wingspan of a tandem-wing aircraft?

When calculating the wing-span of a tandem-wing aircraft, like the QAC Quickie Q2, which set of wings do we use for that value? There are two sets of wings, and they both provide lift. In the class, ...
3
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2answers
187 views

What are the pros and cons of sealing the gap between the wing and the aileron?

I read somewhere that sometimes gap between the wing and aileron is sealed and this is done to reduce drag. But somewhere else I read that "slotted" ailerons allows for better aileron ...
2
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2answers
181 views

What are benefits of unloaded wingtips?

What are aerodynamics benefits of using unloaded wingtips (zero lift)? does unloaded wingtip make inner parts of wing more efficient? (I know that unloaded wingtip reduces bending moment,so structural ...
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2answers
110 views

How do wing tip vortices that interact with the wing surface affect drag?

Often people say vortices are behind the wing so they cannot produce drag, I am not interested in those vortices behind the wing.... I am interested how wing tip vortices which interact with the ...
0
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1answer
103 views

Pitching Moments CG vs CP vs AC

Probably the question will be a little bit confusing but I'll try my best to make it clear. Due the position of the CP with respect of the AC, symmetrical airfoils don't produce pitching moments, but ...
4
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2answers
179 views

Has anyone tested or flown permeable wings to increase efficiency?

See this article: Aerodynamic Performance Improvements Due to Porosity in Wings at Moderate Re Was wing porosity ever tested/used for real aircraft? source: The aerodynamic efficiency parameter ...
4
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2answers
224 views

Why are the Antonov An-124 horizontal stabilisers directly behind the wings?

With the wings being on the same plane as the horizontal stabilisers, turbulent air from the wings would interfere with the airflow over the elevators making them flutter. Surely putting the ...
2
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4answers
177 views

Wing dihedral in a biplane

Would a biplane be able to fly if the upper and lower wings were in opposite dihedral? Imagine a wing configuration similar to the fictional "X-wing" design from StarWars. What would be the ...
16
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6answers
5k views

Do black wings have better aerodynamics?

This news article links to a 2019 academic study: Thermal impacts of wing coloration on surface temperature during bird flight. Most of birds have dark upper wing feathers. Dark colors keep a sunlit ...
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0answers
16 views

How to calculate the the variation of Cl wrt the angle of defection of the elevator?

I've checked the lift requirements of the aircraft and selected an optimal airfoil and designed a wing with dimensions of MAC 47cm and semi-span of 163.2 cm and a airfoil S1223. The horizontal ...
2
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0answers
72 views

Why do tapered wings not stall at the root first?

Why do moderate tapered wings stall first at mid-wing section and high tapered wings stall at tip first? The effective AoA should be always higher close to the root? (considering no geometric or ...
8
votes
1answer
656 views

What's this part on the wing of BAE Systems Avro 146-RJ100?

It was always a question that what's this part on the wing of BAE Systems Avro 146-RJ100: Is it kinda aerodynamic component?
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0answers
43 views

How to model the rounded tips of a rectangular wing?

Here again for my report about the aerodynamics of a wing. Now I am dealing with the Fuji FA 200-180 wings. I am trying to draw the wing in Matlab. This aircraft has a no-tapered rectangular wing, so ...
1
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1answer
211 views

Why aren't grid fins used as wings for low speed aircraft?

Grid fins are used "commonly" in aerospace - usually for things like control of guided bombs or spacecraft. The most obvious example is SpaceX's use on the Falcon 9, but the US and Russian ...
0
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1answer
97 views

How many zig-zag patterns are there in a dog tooth leading edge? [closed]

And also what is the difference between saw tooth and dog tooth leading edge? Like is there any difference in the number of "zig-zag" patterns on the wing?
2
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1answer
153 views

Why doesn't the centre of pressure move in the case of a symmetric aerofoil?

Why doesn't the CP (centre of pressure) move in the case of a symmetric aerofoil? Also, why does the CP move backward in the case of a flat plate?
3
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1answer
135 views

Would a wingtip stall still be bad if there was no aileron there?

If there was no aileron on the wing tip, would a tip stall still be bad compared to a root stall?
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2answers
78 views

What does it mean for a wing's lift distribution to be elliptical when the planform is not? [duplicate]

How would you go about finding an equation for the lift coefficient of this wing where the lift distribution is known to be elliptical but the planform is not?
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0answers
23 views

Computing Cl using Cp values? [duplicate]

So, from a Lab, I have Cp values for an incidence corresponding x/c on the upper and lower surfaces and I would like to calculate the Cl value at this incidence. I'd like to do this through python, so ...
4
votes
1answer
217 views

What is this intake bottom the wing of C-5 and why is it placed there?

There are two intakes bottom the wings of C-5. What are those and why are they placed there?
1
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2answers
175 views

Will increasing the wing area result in higher aircraft range?

Intuitively, it seems that a low loading (large area) wing will allow to climb higher from the start, thus increasing true air speed and range. At the same time, a low loading wing also calls for a ...
4
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1answer
351 views

What are these crevices below the wing of B-52 bomber?

What are these crevices below the wing of B-52 bomber?
24
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3answers
3k views

What is this part which is mounted on the wing of Embraer ERJ-145?

Take a look at the yellow parts which are mounted on the wing of an Embraer ERJ-145. What is it? Two closer images: From bottom:
1
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1answer
83 views

Why does the elliptical wing planform have two different types of curves?

Generally, I have seen that the planform of an elliptical wing consists of two different types of elliptical curves The elliptical curve towards the leading edge has a lower value for semi-minor axis ...
1
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0answers
61 views

Do modern aircraft still use load bearing ribs in wing construction?

Modern aircraft are generally of monocoque construction. Does this apply only to the fuselage, or are modern wings made without load bearing ribs as well? Are they just for shaping of the metal skin?
1
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1answer
60 views

Why generation of lift is more at mid span of the wing?

For the same condition like same density, wing area, free-stream velocity, From the above figure one can see more pressure differential and hence more lift at mid span of the wing? What causes this ...
2
votes
1answer
76 views

How do coefficient of lift/drag variation with speed differs between swept and unswept wings?

Trying to understand the coefficient of lift/drag of swept and unswept wings as speed increases. Some example questions and statements- A swept wing will have a lower max Cl at subsonic and ...
0
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1answer
467 views

What is the exact wing chord length and thickness for Boeing 747?

I can't find this info anywhere and all they give me is the ratio. However, I need the exact/approximate values
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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 ...
2
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2answers
252 views

Why are wings not tapered all the way to reduce vortex drag?

Wingtip vortices are created by, well, wingtips. These vortices create drag. One of the approaches to reducing this drag is taper the wing, source source Will eliminating the wingtip, as on the ...

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