Questions tagged [wing]

For questions on an airplane's main wing

Filter by
Sorted by
Tagged with
1
vote
1answer
523 views

How do the wings connect to the centre wing box?

First of all does the centre wing box form part of the fuselage as it's in the centre of the fuselage? Secondly how does the wing spars connect to this centre wing box to hold everything together?
5
votes
3answers
2k views

What effect does wing loading (high and low) have on aircraft performance?

I've read that stalling speed is partly determined by wing loading. Correct me of I'm wrong - "Aircraft with high loading have more weight relative to their wing area hence the stall speed is ...
2
votes
2answers
269 views

What are the handling effects of converting a dihedral wing to polyhedral?

I'm looking at plans to build a radio controlled (RC) glider that is launched by rocket boost mainly as a park flyer. I've been given a set of plans for a model that is a dihedral wing (see attached ...
1
vote
1answer
153 views

How do I choose the correct params?

I am very new to airplane design. I am working on this project to design a flying wing glider (no propeller) that would glide in a circular pattern with a fixed radius of 250 m after being released at ...
1
vote
1answer
69 views

What parameters to focus on when constructing a wing for turning? [closed]

I want to construct a flying wing (glider) with the sole purpose of performing a helical turn (or a circular turn with no propulsion attached) with somewhat of a fixed radius. What should be the main ...
4
votes
1answer
257 views

Is it coincidence that the B-2 and YB-49 flying wings have exactly the same wingspan?

Development of the Northrop Grumman B-2 Spirit began as far back as 1979; however, this was nearly thirty years after the last flight of Northrop's earlier flying wing the YB-49. There aren't many ...
4
votes
2answers
377 views

Why can't commercial aircraft have a wing boundary layer suction system?

I've read that NASA's boundary layer suction system on the wings can reduce drag by removing the boundary layer through the suction holes. If this can reduce a lot of drag (hence improving fuel ...
0
votes
0answers
59 views

Could box-wing aircraft be the plane of the future [duplicate]

I've read that box-wing aircraft can reduce wingtip vortices caused by induced drag hence saving up a lot of fuel and hence able to carry more passengers. Would we able to see such aircraft in the ...
0
votes
0answers
102 views

Why don't commercial aircraft have variable sweep wings? [duplicate]

I was wondering why commercial aircraft don't have variable sweep wings just like the Bell X-5 did? By sweeping the wing further at high altitude it helps the aircraft move faster and also it helps ...
1
vote
0answers
206 views

Are there any lift or lift coefficient equations which factor in the flap deflection angle?

I'm asking this because I tested a NACA 2412 wing with an adjustable flap in a subsonic wind tunnel and I'm getting the lowest Cl values for the highest flap deflection angle.. which to my knowledge ...
1
vote
4answers
239 views

Why are early wing planforms mostly rectangular?

I am looking at the history of wing planforms, and I am having trouble finding reasons for why the wright flier and other early aircraft were built with rectangular wings. I thought it was due to ...
0
votes
0answers
40 views

Calculating Lift of a closed-wing drone

A group of students and I are designing a theoretical closed-wing drone and need to calculate lift based on the NASA lift equation. We've designed fixed-wing aircraft before and when it came to ...
6
votes
2answers
1k views

Why was the B-52's wet wing more susceptible to fatigue than its dry wing, and not less?

After years of carrying all its fuel in the fuselage, the B-52 transitioned to a wet wing (where the wing structure is used as one or more fuel tanks) with the B-52G. This caused severe problems with ...
3
votes
1answer
258 views

Why did this delta wing generate a lower Cl at a higher wind tunnel velocity?

I'm an aerospace engineering student,and just did an aerodynamics lab in which we measured the lift & drag of a delta airfoil inside a wind tunnel between 0 and 40 degrees, in 5 degree increments, ...
1
vote
1answer
491 views

Which type of fan is better for wind tunnel testing?

I would like to build a small wind tunnel to test a miniaturized wing/airplane. I have two options, using axial blower (picture 1) or using centrifugal blower (picture 2). The first will be the wind ...
6
votes
1answer
434 views

Do the F-18's leading edge flaps deflect symmetrically in rolls?

When the F-18 Hornet does rolls, do the Leading Edge Flaps (LEFs) deflect symmetrically or is the deflection different on the left and right LEFs?
0
votes
0answers
76 views

Wing fuselage joint in small aeroplanes [duplicate]

I know that there are bolts to connect the centre wing boxes of the fuselage and wings in large aircraft, but what are the methods of connecting the wings and fuselage of small aeroplanes? I’m mostly ...
0
votes
2answers
301 views

Is moving payload masses during flight to restore mass centering, or to avoid having to trim, a useful approach?

Note: Title was previously "Movable big missiles/bombs/tanks under fighter jets: conceivable?" Example: lateral weight distribution in fighters Fighter-bombers jets are small and lightweight in ...
4
votes
1answer
241 views

Is the "wing area" of a biplane the projected area or the total area?

When you specify the wing area of a biplane, do you specify the planform area (the projected area) or do you specify the effective area of both the wings?
20
votes
3answers
7k views

Why do non-aerobatic aircraft have a negative G limit?

Why do airplane wings have limit load of both positive and negative g's (e.g., the Weedhopper ultralight has a load factor of +5 and -2gs). Why not just have a positive limit load since most airplanes ...
18
votes
1answer
9k views

What is this hole on the left wing of the Eurofighter Typhoon?

I came across the picture below and saw the hole near the centerline on the left which appears to have some carbon next to it. What is its purpose and where does the carbon come from?
1
vote
0answers
74 views

Do winglets really improve efficiency and reduce drag? [duplicate]

Below are some pictures of various fixed wing aircraft with winglets. It is widely accepted that these winglets will improve an airplane's performance by reducing drag and therefore improving fuel ...
5
votes
1answer
648 views

Why do wings prefer laminar flow if cd is lower for turbulent flows?

Can anyone please explain to me why we prefer to maintain laminar flow over wings, despite the fact that the overall coefficient of drag appears to reduce as the Reynolds Number increases? I have read ...
24
votes
5answers
7k views

Could the principle of owls' silent flight be used for stealth aircraft?

I was wondering about the ability of owls to fly so silently. Is it because they flap gently, they flap less often or do is their structure responsible? I was thinking their principle of stalking can ...
1
vote
0answers
617 views

What is effective airflow?

As I understood, when the relative airflow meets the wing it changes, and the resulting flow is called effective airflow?
1
vote
0answers
129 views

What replacement wings are available for old F-16s?

Eventually, material fatigue will force any aircraft to either be grounded or have its wings rebuilt, or replaced. And please, correct me if I'm wrong. For the F-16, if one were to replace its wings, ...
1
vote
1answer
784 views

Why does the stall angle decrease as camber increases?

I have a rough idea about why $C_{{l}_{max}}$ increases with increase in camber. But I can't explain why the stall angle decreases simultaneously.
2
votes
1answer
175 views

Downwash distribution on basis of Lift distribution

I am new here so I might make some elementary mistakes. Correct me if I am wrong. I just stumbled upon the downwash distribution for a given lift per unit span distribution along the wingspan. I have ...
0
votes
2answers
436 views

Why the Mig21 don't use the ailerons like control surfaces on delta wings at landings or take off?

Mig21 is a delta wing , so why do not use the ailerons like any other delta's ? For lowering the approach and touch down speed. It is not possible that?
15
votes
2answers
3k views

Why does the Pilatus PC-24 have such a large "Airplane Support"?

The PC-24 has, under the fuselage, a kind of huge support to hold the wings. If we compare with the Citation CJ4 or the Phenom 300, this difference is quite significant. Why??
9
votes
5answers
4k views

Why are the wings of some modern gliders tadpole shaped?

Why are the wings of some modern gliders tadpole shaped, rather than teardrop shaped? An example is the Schleicher ASG 29. Or did they just add a flat plate at the trailing edge for the flaps and ...
2
votes
1answer
148 views

Do commercial passenger airplanes have cambered airfoils?

It seems to me that they logically would, since they have no need to fly upside down like an aerobatic plane would (so they would not need a symmetric airfoil for any conceivable reason). That being ...
0
votes
1answer
140 views

What are the effects of dihedral on net lift of a wing? [duplicate]

I read somewhere on the internet that dihedral decreases wing lift,so my question is will dihedral decrease the lift of an airplane wing since the wings are attached to the fuselage at an angle ? If ...
2
votes
4answers
264 views

Where is the compression on a compression strut in a tube and fabric airplane coming from?

I understand the functions of every part of a tube and fabric (two spar) ultralight wings and the loads they carry but what keeps puzzling me is the compression strut of a two spar wing as seen above. ...
3
votes
3answers
665 views

Are exoskeleton wings technically possible?

While there have been a robot simulating a bird, could be there also an exoskeleton wing system for a human? Main design considerations: a) only human powered b) using an additional, or exclusive ...
2
votes
1answer
185 views

What is the drag optimized wing form for given lift and bending moment?

I am trying to build a passive hydrofoil board. Something like this: I want to use wood and i am coming to the conclusion that i want to optimize drag for a given ...
10
votes
3answers
2k views

How do slats reduce stall speed?

I've read in PHAK that slats reduce stall speed, but in what way? Is it because of the increase in surface area?
5
votes
2answers
303 views

What is the function of cross bracing of interplane strut?

Pic 1 is the top and lower wing of a biplane called Bloop Ultralight,what is the function of the cross bracing between the interplane struts as seen in pic 1(I'm not talking about landing and flying ...
1
vote
2answers
246 views

Can the back tail of an airplane move the neutral point backwards?

I'm currently in the process of designing a prototype aircraft and since I don't have very much experience with this I have the following question: I know that the center of gravity of an airplane ...
4
votes
2answers
239 views

Why are propeller driven aircraft commonly built with a higher wing aspect ratio and a straighter wing angle?

Why do propeller driven aircraft (especially smaller ones like fighters) tend to have a narrower wing with a higher aspect ratio and a more perpendicular wing angle in relation to the body, whereas ...
15
votes
2answers
3k views

Why does this Strikemaster have a textured leading edge?

I was at Duxford recently, and spotted a Jet Provost Strikemaster that had a rough texture applied to a portion of the leading edge of the wing. Why was this applied?
2
votes
1answer
296 views

Does the wing always have an adverse pressure gradient along the chord?

I know that there is an adverse pressure gradient on the upper surface of the wing, which leads to boundary layer separation. Is there any condition under which there is no such adverse pressure ...
1
vote
1answer
116 views

How much do a DC-9's wings weigh?

How much do the wings weigh? How much does the landing gear weigh? How much fuel does it take to fill the tanks? We, at Confederation College are trying to donate a DC-9 for training purposes and ...
3
votes
1answer
337 views

Did B-17 gunners beat on the wings of other planes in their formation?

I am certain my father, a B-17 pilot, told stories about his gunner having to beat on the wing of another plane in the formation with the tip of his gun to get the pilot to pull away and avoid a mid-...
2
votes
3answers
381 views

Does a biplane need wing twist?

Does a biplane need wing twist? I understand wing twist is used to: creat a soft/partial stall ( hopefully create a partial stall before a full stall) balance the wing so a smaller horizontal tail ...
0
votes
1answer
135 views

Is lift generated only by wings? [duplicate]

In modern aircraft is lift only generated by wings or can other parts of fuselage generate a significant amount as well, to the point it needs to be accounted for when designing a plane?
0
votes
0answers
73 views

What is the reason for circulation of air around an airfoil? Based upon the circulation of air, why are airfoils shaped the way they are? [duplicate]

Foreword: I am an Aerospace Engineering student and next year is my third and final year, starting September 2019. I was taught approximately 2 semesters ago that the correct theory of lift is that ...
3
votes
2answers
613 views

Historical gap in high aspect ratio wing transport aircraft

Reading about recent Boeing's high aspect ratio wing concepts for commercial aircraft, such as TTBW and SUGAR, I couldn't help but think of the Hurel-Dubois aircraft, where similar aerodynamic choices ...
2
votes
1answer
258 views

Where is the midspan airfoil located on the 737?

The 737 has a root airfoil, two midspans, and one outboard. Is the midspan located under the fuselage or between root and tip?
42
votes
13answers
9k views

Other than a swing wing, what types of variable geometry have flown?

We're well familiar with swing wings, on small and large aircraft from both the east and west. What other types of variable geometry have been tried?

1 2 3
4
5
13