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.

Filter by
Sorted by
Tagged with
0
votes
0answers
21 views

How is the wingspan of a wing measured if it has a dihedral? [duplicate]

I am having some confusion regarding how the wingspan is measured, I just wanted some clarity because this was bugging me while I was reading about aircraft wings. According to NASA's "Wing Geometry ...
1
vote
2answers
204 views

How do slats actually work?

I want to know what is the difference between slats and flaps and the mechanism of the slats This what I know and researched about flaps: Flaps are a kind of high-lift device used to reduce the ...
3
votes
2answers
378 views

Why does the mass penalty of cantilever vs externally braced wing decrease with aircraft size?

From Wikipedia Cantilever wings require a much heavier spar than would otherwise be needed in cable-stayed designs. However, as the size of an aircraft increases, the additional weight penalty ...
0
votes
1answer
121 views

Why do airlines not paint the wings on their livery? Why? [duplicate]

Does anyone know why airlines do not paint the wings on their aircraft? What is the reason why?
2
votes
2answers
364 views

Can aircraft fly without wings? [duplicate]

Is it possible that a aircraft can fly without having wings? I am wondering if somehow it can fly then will aircraft will be able to maintain the balance.
0
votes
1answer
68 views

What exactly is “plunge?”

I'm doing a project in which i'm attempting to model the motion of a wing using a system of second order differential equations. This is a 2-degree-of-freedom model based on the quantities pitch, a(t),...
2
votes
1answer
97 views

What are typical values of the lift-to-drag ratio for normal small aircraft?

Hi I am trying to do a rough estimation of forces acting on an aircraft wing and would like to know what kind of lift to drag ratio is normal. The exact profile hasn't been chosen yet, but the ...
0
votes
0answers
21 views

VLM at High Speeds and High Angle of Attack

I want to analyze a plane of the size and speed of a commercial jetliner. I have made the model of it on OpenVSP. I am using VSPAero's Vortice Lattice Method for the same. I want to analyze the plane ...
0
votes
0answers
19 views

Is there any go to formula in the designing of a winglet? [duplicate]

we have to design a commercial airplane as a part of a college assignment and i was wondering if there are any rule of thumb /formulas involved in the designing of winglets? Or does one have to assume ...
4
votes
1answer
165 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, ...
2
votes
1answer
36 views

What is the threshold between high Aspect Ratios and low Aspect Ratios?

Oftentimes when describing flying organisms and vehicles, their wings are said to have a "high aspect ratio" or a "low aspect ratio". Sometimes the papers (that I read) gave the numbers, but more ...
0
votes
1answer
45 views

Design lift coefficient of an airfoil

I have the design lift coefficient of the plane during the cruise condition. Now, I want to calculate the lift coefficient required by the airfoil which makes up the wing, taking into account the ...
-1
votes
1answer
164 views

Can such an aircraft take off vertically?

The compressor ejects compressed air from the gap at high speed. The red arrow represents the path of compressed air. It is lift that adjusts the speed of the compressed air to adjust the aircraft.
1
vote
2answers
90 views

On which axis do we measure angle of attack and airspeed?

The lift value depends on the relative airspeed of the plane. That's what every website says without anymore explainations. But as we are talking about lift, are we talking about the relative speed ...
2
votes
1answer
55 views

How is wing area defined?

When the plain "wing area" is given in basic aircraft specifications, what area does it usually refer to? Is the same area used for calculating the wing loading? For example I have a fuller ...
1
vote
4answers
236 views

Why do flaps retract?

Why do flaps retract? I know, it might seem obvious at first, because of drag, but instead of retracting the flaps, can't they just make the flaps flexible enough to get into a reduced drag position, ...
5
votes
2answers
153 views

Why do shockwaves progressively move aft as speed increses?

As an airfoil moves from subsonic to supersonic, the shocks that develop over the surface move progressively toward the trailing edge. What is the physical explanation for this behavior? As a side ...
1
vote
2answers
197 views

Could a triplane fly using a dihedral wing in the middle?

I wonder if a triplane glider whose front view is shown in the figure can be built and flown successfully. As you can see, the middle wing has a dihedral angle, but the top and bottom wings do not. ...
0
votes
0answers
30 views

How to calculate the mass moment of inertia of a symmetric wing like NACA-0012?

I am working on the pitching mechanism of a NACA-0012 wing. I have the mass and found out the centre of mass of the wing but the software (OpenFOAM) needs more parameters such as the mass moment of ...
4
votes
2answers
2k views

Why are highly cambered airfoils rarely used in propellers or wings?

Highly cambered airfoils like the Seligs and Epplers are hardly ever used in propeller or wing sections. Why? Does their performance reduce at high Re? Are they only adequate at low Mach, low Re? ...
2
votes
1answer
164 views

why some airplanes have their exhaust gases vectored above the wing?

I was looking at images of the SkyCourier shown below and i have noticed the asymmetrical exhaust pipes in both engines (one pointing up and one is straight), doing my research on the internet, i ...
4
votes
1answer
644 views

Why do all fifth generation fighters (J20, F22, SU57) put their wing above the fuselage?

I heard that upper wing could increase stability, but why do fighters need it? Or are there some other reasons? Please specify.
1
vote
0answers
84 views

How do I reinforce a tubular spar that has been drilled vertically for an attachment bolt?

Previously posted a question about lift strut attachment to tubular wing spar with a bolt vertically through the spars. See drawing below. I tried using Bruhn's analysis book to formulate a a ...
4
votes
1answer
355 views

Why do all fifth generation fighters (J20, F22, SU57) use Trapezoid wings?

It seems that trapezoid wings are used by all fifth generation fighters (although the wing of J20 looks quite like delta wing), but why? What made a trapezoid wing so attractive? Why don't they use ...
4
votes
1answer
151 views

What's the wisdom of attaching an aircraft lift strut to a wing spar utilizing a single eye bolt vs the common two plate or strap method?

in the enclosed picture are three examples of types I'm speaking of. In the top picture, the lift struts are attached via a single eye bolt. The eye bolt is obviously vertical through the wingspar ...
2
votes
3answers
284 views

Why is a rectangular wing planform less efficient than others?

I read somewhere that a rectangular wing is inefficient compared to other wing planforms. Can someone clarify why this kind of wing planform is inefficient compared to other planforms and what causes ...
2
votes
3answers
197 views

Does the Prandtl flying wing have a lower maximum speed than other designs?

Does the design of the wing with its "twist" near the wingtips necessarily limit the maximum speed of an aircraft utilising that technology? Also, with the leading edge profile/attack angle varying ...
1
vote
1answer
162 views

Are there any NACA airfoils that resemble the X-29's wing?

As a part of my project, I am trying to perform structural and aerodynamic analysis of a forward swept wing on an aircraft, specifically the Grumman X-29 (pictured below). I am assuming that ...
3
votes
1answer
88 views

How to calculate bending moments and shear forces on a wing?

I am trying to create a MATLAB script to plot the Bending Moment Diagram (BMD) and Shear Force Diagram (SFD) as a function of spanwise distance, x, along a wing from the wing root (x=0) to the wingtip ...
2
votes
2answers
217 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. ...
1
vote
0answers
38 views

What is the effect of wing flex on wing's airfoil shape and its performance effect on wing?

There are good amount of discussion on wing flex in this forum. I am more interested in understanding the effect of flex on aerofoil shape of the wing and its impact on flight performance. Do ...
1
vote
1answer
180 views

Airfoil and Wing Analysis for Transonic Speed (M = 0.85 and Re = 42 million)

I am working on a project where I have to design a plane which has to cruise at 0.85 Mach at 35,000 ft. While working on the wing design, I quickly discovered that 6 series airfoils, with a good ...
5
votes
4answers
1k views

Does the tailplane have a positive/negative camber?

I've read that the tailplane produces negative lift, so does that mean it would function like an inverted wing (has negative camber)? The image below is the best illustration I could come up with. ...
3
votes
1answer
227 views

Why were most of the first-generation-Learjet wing mods never approved for the Learjet 23?

First-generation (straight-wing1) Learjets (the 23, 24, 25, 35, and 36) are, rather infamously, beasts to fly, due in part to their hideous stall behaviour;2 due to their flow-separation-prone laminar-...
3
votes
1answer
95 views

When calculating the lift coefficient, what area is used?

Lets say I had this rectangular double curve wing. Orange represents the chord length, red represents the airfoil outline length below the chord line, green represents the airfoil outline length above ...
2
votes
1answer
194 views

If the modern airliner was redesigned from scratch, would it look functionally different? [duplicate]

If the modern airliner (Boeing/Airbus) was redesigned from scratch today without any need for "backward compatibility", would it look functionally different from the current design? And if so, what ...
3
votes
2answers
134 views

Why do airfoils in an airplane's wings have different shape and size along its span?

Why wings of an airplane consist of different shape and size of airfoil. What will happen if the thickness of wing are same throughout the wing?
1
vote
1answer
83 views

F4u race wing design [duplicate]

Can anyone suggest a good airfoil for racing the F4U Corsair? I'm building an RC model but I want it to be fast unlike scale warbird. Any suggestions on wing design and airfoil would be greatly ...
5
votes
6answers
6k views

Can a wing generate lift in excess of its aircraft's weight?

"For a plane or bird to fly, its wings must produce enough lift to equal its weight. " I got that excerpt from "https://www.sciencelearn.org.nz/resources/300-wings-and-lift". My questions: (1) Can ...
2
votes
1answer
143 views

Does turbulent flow encourage/avert flow separation?

I know that turbulent flow has more energy than laminar flow and hence can sustain adverse pressure gradient for a longer period of time. It basically delays flows separation. But referring to this ...
5
votes
1answer
261 views

What is the outer kink on the airbus 340-600?

I was checking some information about the a340-600 and got this statement: "thickness/ chord ratios 15.25 per cent at root, 11.27 per cent at inner kink, 9.86 per cent at outer kink and 10.60 per cent ...
12
votes
2answers
1k views

Can anyone explain the reflex wings used in powered paragliding?

There are some paramotoring wings presumably designed for higher speeds. The method is to allow a portion of the wing near trailing edge to flutter in high speed, rendering it unaccountable for ...
0
votes
1answer
102 views

Building optimal RC flying wing [closed]

I have an EMAX motor that operates at maximum efficiency generating 200g of thurst. This is the only fixed parameter I have. How do I find the most efficient wing design for this flying wing, ...
0
votes
0answers
50 views

Will this thick annular wing have a nose-up pitching moment in tilted forward flight?

As you know, a ducted fan/propeller (Figure C) has a strong tendency to pitch the nose-up during "tilted " forward flight due to the front part of ductlip itself generating more lift. Thus any ...
1
vote
3answers
269 views

What is the relationship between centre of gravity, centre of pressure and pitch?

Ok so I've got a couple of questions regarding CG, CP and pitch 1) When the aircraft is taking off, is the tail down force required to pitch up the aircraft high? Because the aircraft always has a ...
1
vote
1answer
144 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?
4
votes
3answers
332 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
124 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
119 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
64 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 ...

1
2 3 4 5
11