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Questions tagged [wing]

The structures extending from the sides of the plane that generate most of the lift to keep the plane in the air.

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4answers
4k views

Do high-wing aircraft represent more difficult engineering challenges than low-wing aircraft?

Generally, it's easier to make things strong in compression than in tension. In a low-wing plane, the weight of the aircraft is on top of the wing; in a high-wing aircraft, it hangs from it. It ...
2
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2answers
52 views

CG calculation for a swept wing aircraft

With a swept wing aircraft (specifically a MiG-25 I am modelling) where is the root chord taken from to calculate the location of CG? Is it the root chord of the wing (where it attaches to the ...
8
votes
1answer
204 views

What are the circled features on the upper surface of the A380 wing?

On the A380 wing are at least 3 red circle each side. There seems to be a black part inside. Is this a dip stick, or something else?
6
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1answer
221 views

Why is a rectangular wing with winglets not better than an elliptical wing?

Why is a simple rectangular wing with winglets not better than an elliptical wing in terms of induced drag and produced lift?
22
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5answers
9k views

Why was the Spitfire's elliptical wing almost uncopied by other aircraft of World War 2?

The Spitfire was one of the most successful designs of its day, with flying qualities of a similar standard to the other best designs of the era. In its decade of production from 1936 it grew bigger, ...
4
votes
1answer
264 views

How are elliptical winglets better than blended winglets?

I've read in few papers that elliptical winglets give better performance than blended in terms of their L/D ratio. I am not able to find why elliptical winglets are better. the two differ by their ...
4
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2answers
205 views

Why isn't the bell distribution used?

Why has the bell distribution not become widely used? Is the bell distribution only ideal in inviscid flow scenarios or is there another reason for the lack of use?
6
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1answer
155 views

Do any aircraft possess washed-in wing characteristics?

I have been teaching ground school at my local Canadian Air Cadets. When I was teaching about the wing twist of an aircraft, I was asked if any aircraft possess washin characteristics (vs washout). ...
4
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2answers
116 views

Does load factor affect roll rate?

To be clear I am referring to a given aircraft at a given weight, speed, attitude, etc everything else the same except one is at say 0.5g and the other at 2.5g will there be a difference in roll rate ...
10
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1answer
3k views

Airplane gently rocking its wings during whole flight

I was on a flight with a regional airline a while ago in a Bombardier airplane (if I recall correctly) where the airplane would slowly and gently rock its wings just a little bit on the whole flight. ...
2
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1answer
176 views

What is a lambda wing?

I was reading a description of the Boeing X-45 that described it as having "lambda wings." What is a lambda wing and why is it called that?
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2answers
70 views

Are flaps a good idea for airfoils with a lot of camber?

I have a wing with an airfoil s1223 which is an airfoil with a lot of camber. the take off distance is limited so I want to implement flaps for this issue but I have the doubt if this is a good idea.
1
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0answers
18 views

Is some sweep beneficial with taper?

I'm developing a canard glider which requires some taper for the canard to stall first. I understand that sweep is typically only for aircraft in a compressible airflow (M >= 0.3), but is there any ...
1
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0answers
79 views

What are the effective span and lifting properties of a circular wing?

Today I read an article on FlightGlobal about the Bell air taxi demonstrator. It includes some paraphrased quotes from the Bell VP of innovation, Scott Drennan, among which the following stood out: ...
1
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1answer
118 views

Anyone able to help identify what aerofoil this is?

Firstly, apologies for the potato quality of the image below. I am attempting to determine the qualities of a VTOL and cannot find any data online. If anyone knows what aerofoil this could be that ...
2
votes
2answers
413 views

How can a Cessna cut the wing of a Boeing?

I read days before about the collision of the flight PSA Flight 182 on September 25, 1978. I was wondering how is it possible that a Cessna 172 can CUT Boeing's 727-214 wing. There is a video with the ...
3
votes
1answer
132 views

Air flow over an airfoil

We know that in real viscous flow, boundary layer exists around the airfoil and there will be a separation point which flow starts to separate from the back of the airfoil( velocity gradient equal ...
1
vote
1answer
112 views

Who made the first high-wing jet airliner?

I thought the only high-wing jet airliners were made by the Soviets but the British Aerospace RJ-100 and Dash 6 series twizzled my mind. So who made the first high-wing jet airliner?
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0answers
43 views

Why there are nearly no upper wing jetliners? [duplicate]

Whenever I look at the western airliners. All of their wings are always mounted on the lower part of the fuselage except the Dash 8 series which have turbo props. But the Soviet jetliners have their ...
0
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0answers
21 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 ...
1
vote
1answer
72 views

Load testing a model glider wing

I wish to load test a model glider wing. The standard static load test methodology using sandbags on the upturned wing would be difficult as the chord of the wing is small - it will be difficult to ...
0
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1answer
65 views

What airfoil type is used on the B727-200F?

What airfoil type is used on the Boeing 727-200F? Is it a NACA profile or something else?
9
votes
1answer
202 views

How do flaps deploy and stow with very large wing flex?

On large airliners, the wings are generally of the high aspect ratio types and hence very flexible. Now the flaps are attached to wing only through a series of tracks, and as the wings flex, these ...
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0answers
167 views

How much performance penalty is incurred from a WW2-era folding wing mechanism?

I'm interested in WW2-era single-engine piston-prop monoplanes. I'm interested in the folding wing mechanisms from the perspective of performance, chiefly two things: How much extra weight does it ...
5
votes
2answers
240 views

Why the Antonov AN-225 has negative dihedral wings combined with a positive dihedral horizontal stabilizer?

I know the reason why it has negative dihedral wings, but I do not really know why it is combined with a positive dihedral horizontal stabilzer, which are the benefits this configuration provides?
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1answer
161 views

What are the dimensions of the A320's wingtip fences?

Does anyone know the size (relative to the wing) or have a schematic draw of these wingtip fences?
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2answers
129 views

What are (wing area)/(weight) ratio in birds and airplanes? [closed]

I like to know the usual ratio of wing area over weight in birds and airplanes? I mean if total weight of an airplane is 100 Lbs(Kg), how much should be the least ...
1
vote
2answers
211 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 ...
0
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2answers
150 views

In an airplane wing, which one is primary, and which one is secondary

I got this device detail of a wing. Those parts are: 1: wingtip fence, one of the wingtip device beside winglet. 2 & 3: aileron. 4: flap track. 5 & 6: slat. 7 & 8: flap. 9 & 10: ...
1
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2answers
98 views

Forces that wing attach fittings must transfer to fuselage?

I just saw the naked wing (it didn't have its wing fabric) of a Weedhopper ultralight and wondered the types of forces that the wing lift struts must transfer to the fuselage, apart from the apparent ...
1
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1answer
129 views

What is the wing span in aspect ratio's calculation?

We all know that the aspect ratio of an airplane is calculate as: $$AR=\frac{b^2}{S}$$ Where: $AR=$ Aspect ratio $B=$ Wingspan $S=$ Wing's area In an airplane, wing span is the distance from tip ...
2
votes
1answer
118 views

Does the wing to fuselage fittings of an airplane ever experience shear load?

Do wing attach fittings of semi-cantilevered plane (i.e. ultralights) ever get subjected to shear force? For example during roll, does the centrifugal force of the wings load the wing attach fittings ...
52
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8answers
23k views

Why are fuel tanks located in wings?

Passenger aircraft have fuel tanks in the wings. Why? What are the advantages and disadvantages of this location ? examples of disadvantages I would suspect: added weight increases the structural ...
4
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2answers
179 views

Why does a sharp leading edge result in a larger pressure peak?

I know in the real world the sharp leading edge (LE) will results in a larger pressure peak compared to a large radius LE. And that there are three types of stall. But I want the explanation in ...
0
votes
1answer
87 views

What should be the relative positions of a wing's aerodynamic center and center of gravity?

A positively cambered wing with finite length L has its aerodynamic center AC located 25% from the wing's leading edge. What about the CG of the wing itself (not the CG of the whole plane)? Is there ...
2
votes
1answer
166 views

Does a rotating control surface change the wing area?

It might seem like a silly question, but bear with me. I am using the standard formula to calculate the lift force of a wing. L = (1/2) d v2 s CL My question related to the s part of the formula. ...
1
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0answers
109 views

How can Schrenk approximation be used to model lift load on a rectangular wing?

How can I use Schrenk approximation to calculate load distribution on my rectangular wing? A worked example will be appreciated.
0
votes
1answer
234 views

Why is A320's CG optimum position at 25% MAC?

I have read a320's optimum CG position is 25% MAC. But, the aerodynamic center is also at 25% of chord. So since CG and aerodynamic center at the same position, there would be no moment arm of lift, ...
5
votes
3answers
208 views

Are there any specific weight or structural reasons to choose low vs. high wings for a cargo aircraft?

I have a large cargo aircraft concept and I am debating between a high or low wing. It seems like both are viable, but intuitively it seems structurally harder to support a high wing. Alternatively ...
3
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1answer
176 views

What are these bomb-shaped things attached to some propeller aircraft? [duplicate]

I've seen them on a few prop machines and searched here and via Google but couldn't find anything.
2
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0answers
105 views

Where are the black triangle'd seats? [duplicate]

There are two windows marked with a black triangle, which indicate that they provide the best view for the wing, when the crew needs visual. Since A320s are probably the most popular birds out there ...
1
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2answers
493 views

Straight Wings VS Delta Wings, Variable wing with Forward swept capability [duplicate]

What are the Pros and Cons (Advantages and Disadvantages) of a Delta wing and a Straight wing against each other, and if a Variable wing with a capability to become a Forward Swept wing is even ...
1
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1answer
183 views

Circular arc airfoil wing: why does the wing nose down twist due to camber?

I am reading this paper: "Computational Investigation of Microscale Shrouded Rotor Aerodynamics in Hover" Vinod K. Lakshminarayan, James D. Baeder ; JOURNAL OF THE AMERICAN HELICOPTER SOCIETY56, ...
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2answers
153 views

How to calculate the amount of weight my plane can takeoff with?

This is how I approached this problem- My takeoff run is limited. So, depending on my configuration I calculated the maximum possible velocity I can attain in my groundroll. I assumed that at the end ...
3
votes
3answers
444 views

Is lift force less than weight during a descent?

In the above image lift is the same during a climb and during a descent. Is lift force not supposed to be less than weight during a descent? Secondly, does descending at an airspeed much lower than ...
0
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0answers
147 views

Calculating induced drag approximation using XFoil generated parasitic drag

I am trying to do rough predictions of induced drag using the XFoil results for parasitic drag. To do so, I am using the lifting line equation for induced drag and the Oswald efficiency number: $C_D=...
-2
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1answer
193 views

the usage of thin airfoils for high-speed flight [closed]

what is The usage of thin aerofoils for high-speed flight I tried those answers:  They are perfect for controlling the local angle of attack, for instance in turbomachinery and flaps.  At ...
1
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0answers
80 views

How to calculate the shear centre of a wing?

How is shear centre of a wings calculated? i.e. how can I calculate the wing shear centre of a two spar wing with main spar at 0% of wing chord and rear spar at 75% of wing chord? (Assuming the two ...
2
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1answer
104 views

What is the function of a sweep cable?

This is Goat3 ultralight with sweep cables,what is the fuction of these sweep cables?
1
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1answer
209 views

What is the purpose of this span wise “false spar” on Affordaplane wings?

This is the wing of an Affordaplane Ultralight,what is the use of those spanwise foam boards between the foam ribs,I know it's not for aesthetics.