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Questions tagged [airfoil]

The 2D shape of a section of aircraft wing.

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Lift without aerofoil? [duplicate]

I have seen some RC planes flying without any form of airfoil, the wing is literally a flat board. What I want to understand is how lift is generated under these conditions. I understand kinetic ...
FourierFlux's user avatar
4 votes
1 answer
801 views

Why Cessna 152 has different airfoils at the root versus at the tip of the wing?

I recently read that C152 have two different airfoils on its wing. NACA 2412 at the wing root and NACA 0012 the wingtip. Why? And why are those particular airfoils (with their inherent aerodynamic ...
Konrad's user avatar
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Does more lift cause a plane to stall at a lower airspeed?

Does more lift cause a wing to stall later? (By more lift I mean a bigger wing) I was looking and saw this question, but the answers didn’t really address why more lift will help a plane not stall. ...
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What is the main cause of pressure recovery on airfoil?

What is the main cause of pressure recovery over a wing? I’ve narrowed it down to be one of or a combination of 2 things: The higher pressure air from the bottom of the wing equalizing with the upper ...
Wyatt's user avatar
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Does the back pressure on an airfoil stay the same with different speed?

(Inspired by this answer) The back pressure is the force on the rear side of an airfoil (in the pressure recovery zone). When the air streams reach the pressure recovery area on an airfoil, they are ...
Wyatt's user avatar
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How do I choose Cl during cruise flight with a given MTOM and variable S?

Currently I'm challenging myself to build an airplane from scratch. I have a background in aeronautical engineering but I have no experience in actually designing an aircraft from the ground up. (FYI: ...
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Which is more efficient, thickening an airfoil or adding a bottom-surface curve?

So if you were to take a standard airfoil and increase the thickness, you’d increase the lift (Bernoulli’s principle), but it would also increase the drag. Now imagine you have the same airfoil, but ...
Wyatt's user avatar
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At what Reynolds Number does laminair airfoils stop working as expected?

I was watching a RC Plane builder on YouTube create an airliner on a 3D printer and noted he used the scale laminar airfoil of a B-727. It seems to me that laminar airfoils don't work at the scale of ...
jwzumwalt's user avatar
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Where do i find data about the Kamov Ka 50? [closed]

I am a student in Aerospatial Engineering and i have to make a project about this helicopter. Professor asked for some data like: Rotor blade airfoil, Rotor blade width at the beginning and tip of it, ...
Andrei Heroiu's user avatar
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Intersecting Boundary Layers in XFLR5

I am analyzing an airfoil called RevE-HC. While doing a type-1 analysis, I encountered that the BL is intersecting towards the trailing edge. The panels are refined and the geometry is also smooth. ...
Hellbat's user avatar
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How does a glider in steady descent glide with negative AoA? [closed]

EDIT: I now understand relative wind is parallel to the travel of the glider. Ignorance was the basis of my earlier confusion. I looked at some toy and commercial gliders and all of their wings were ...
Charles Nicholson's user avatar
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Does the lift force comes from the bottom or from the top of the wing? [duplicate]

My team and I discussed yesterday how lift is generated based on the pressure analysis. The most popular explanation from books and other sources is that pressure is lower on the top and slightly ...
Luiz Phillyp Sabadini Bazoni's user avatar
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1 answer
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Why is the upper surface shock further forward than the bottom shock on this airfoil?

If you look at this picture, you’ll see the shock on the upper surface is further forward on the wing, compared to the lower shock. Why is that? (This is at Mach 0.9, as shown at the bottom of the ...
Wyatt's user avatar
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Why are supercritical airfoils not used in GA aircraft?

Why are supercritical airfoils not used in GA aircraft? The 787 is assumed to use a supercritical airfoil, so why don't GA aircraft use them? My guess is that they're harder to manufacture, and a lot ...
Wyatt's user avatar
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2 votes
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How do thicker airfoils give better stall characteristics?

Why do thicker airfoils have better stall characteristics? They make more lift, but I don’t see any reason for them to have better stall characteristics. Also, I heard a rounded airfoil nose will help ...
Wyatt's user avatar
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Is the ideal airfoil concave on the underside?

Virtually all airplane wings are convex on both the top and at least part of the bottom. But thus convexity on the bottom creates suction which reduces lift. I can only think of two reasons to have it:...
Abdullah is not an Amalekite's user avatar
1 vote
1 answer
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Modelling airplane wing

In the X-Z plane I have defined an airfoil shape using the function z = f(x). See figure 1. However, since the chord length of real airplane wings increases along the wingspan, I thought I needed to ...
Dazai's user avatar
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How can we adjust the features of an airfoil?

We have a base airfoil with Max thickness 11.7% at 28% chord and Max camber 3.4% at 42% chord. Say, we want to draw our own airfoil based on the previous description but with an increase maximum ...
Chopang's user avatar
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Critical angle of attack at high altitude

I remember hearing somewhere that at very high altitudes, the critical angle of attack for a given airfoil can decrease a bit. Is there any credence to this idea? Thank you
Terry's user avatar
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Camber Line equation and Thickness Distribution equation

I'm a high school student, not majoring in aerodynamics, so I'm struggling to understand the distinction between the Camber Line and Thickness Distribution equations. As I understand it, the Camber ...
Dazai's user avatar
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How can I calculate the surface area of a plane wing

I want to determine the surface area of an aircraft wing using calculus, specifically focusing on the cross-sectional area (thickness distribution) formula. Although I am unsure if there exists a ...
Dazai's user avatar
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2 votes
2 answers
126 views

Why is the pressure lowest towards the front of an airfoil? [duplicate]

According to this answer, the low pressure on top of an airfoil is caused by the curving away of the wing (what I interpreted it as). If you look at the lift distribution over an airfoil, you'll see ...
Wyatt's user avatar
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How do I get rid of this chord line along the x-axis when importing an airfoil into XFLR5?

Whenever I try to import an airfoil into XFLR5, I always notice the chord centerline along the x-axis as you can see in the picture. Is there a way to somehow get rid of this line? I'd be thankful for ...
xdpilot12's user avatar
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Are there any sources that contain information on the airfoils of the Boeing 737-500 and 737NG Aircraft?

I have found some information about this on airfoiltools.com (http://airfoiltools.com/airfoil/details?airfoil=b737a-il) but it doesn't specify the exact version of the aircraft, as the generations ...
Joe Dahl's user avatar
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1 answer
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Are there studies to find surface treatments to reduce the drag of an airfoil?

I know that by designing an airplane or a car close to a teardrop, we can reduce the drag. My question has to do with the surface friction treatment. Some torpedoes glide in water more efficiently ...
kamran's user avatar
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Can composite material be used in leading edge of airfoil instead of aluminium through Additive manufacturing?

I want to know about, is it possible to replace aluminium by additively manufactured leading edge of airfoil by changing different infill patterns to improve the impct strength from bird impact on it.
Muhammad Arslan's user avatar
2 votes
4 answers
275 views

Moving from 2D wing to 3D wing design

In terms of the design perspective of an Aircraft, once we decide on the airfoil that would be used for the wing, how would an Aerodynamics Engineer (or you) proceed to construct the wing? The ...
KNVCSG's user avatar
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2 answers
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Are winglets symmetric airfoils? (Cessna Citation M2)

I want to simulate the Cessna citation M2 in XFLR as a student homework assignment. This aircraft has a NASA high-speed 0213 airfoil (which is not symmetric) and a winglet, which can be seen in the ...
MIKE PAPADAKIS's user avatar
1 vote
1 answer
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P-8A Poseidon Airfoil type

Could someone help me find out what airfoil type is used on the P-8A Poseidon symmetrical, conventional, thin or supercritical airfoil? It seems to be, that the Boeing 737-800, like many commercial ...
Catuchka6's user avatar
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2 answers
160 views

General Thin Airfoil Theory

I can't understand where the equation in the blue circle comes from or is derived from, I know it says the sum of the perpendecular components should be zero, but can you explain visually? and what ...
Dazai's user avatar
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7 votes
2 answers
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Why does a flat plate create less lift than an airfoil at the same AoA?

This picture of the lift curve slopes for four-digit NACA airfoils and a flat plate is from another question on this topic. It shows that at the same positive AoA, a flat plate generates less lift ...
Frank's user avatar
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1 answer
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How to Define Aerodynamic Center for Real-World Airforil?

When using thin airfoil theory, there exist a point that the moment about this point does not vary with Cl, which is the aerodynamic center. However for most of the real-world airfoils, Cm does vary ...
SOAR1123's user avatar
3 votes
2 answers
232 views

How do I plot Cd vs Re graphs for an airfoil?

I am looking for a platform where I can plot the value of the drag coefficient of an airfoil for a range of Reynolds numbers (Cd vs Re plots). I wish to analyze the trend of Cd with changing Re and ...
Aparna Reniguntla's user avatar
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1 answer
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Sluggish response to transients in very high L/D ratio airfoils

A sailplane has very high aspect-ratio wings and can have a glide ratio up to 70:1 (the wing L/D ratio is even higher since the fuselage adds drag). The flow at such high L/D ratios for such long, ...
Kevin Kostlan's user avatar
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1 answer
127 views

Aerofoil selection for a Horizontal turbine [duplicate]

I'm currently having a bit of an issue selecting the type of aerofoil I would want to use in my ridge mounted wind turbine honours project. I want to select a high lift generating aerofoil at low ...
Henry's user avatar
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2 votes
1 answer
196 views

Can a propeller with 90° pitching and symmetrical airfoils generate thrust?

Imagine we have a plane that is already moving at a speed $v_{plane}$. At a certain time $t=0$, a motor starts moving a propeller whose blades consist on symmetrical airfoils with $90^\circ$ of ...
user3141592's user avatar
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0 answers
286 views

How to export cp vector plot obtained in xfoil?

How can I export an image of the plot showing the distribution of pressure coefficient vectors on the surface of an airfoil generated in Xfoil?
Josue's user avatar
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8 votes
4 answers
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What are the effects of having the aileron hinge line on the pressure side vs the suction side of a wing?

I have to choose where to place the hinge line of the aileron of a large remote control aircraft which is to be optimised for endurance. Which is the most optimal placement of the hinge line of ...
Mridul's user avatar
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0 votes
2 answers
117 views

Is the property of having a neutral point (aerodynamic centre) specific to an airfoil shape or will every arbitrary shape will have one?

Is the property of having a neutral point (aerodynamic centre) specific to an airfoil shape or will every arbitrary shape will have one? Asking in mostly context of fuselages.
Mridul's user avatar
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1 vote
1 answer
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Which airfoil is used on the Boeing 737 NG vertical stabilizer/rudder?

Does anyone know what airfoil Boeing uses on it's 737 NG's vertical stabilizer or the rudder itself? I can't seem to find the info anywhere and I need it for a university project.
David Drăghici's user avatar
2 votes
2 answers
1k views

What are the complete assumptions and final conclusions from 'Thin Airfoil Theory' in aerodynamics?

I possess expertise in the field of aerospace structures, however I have recently been assigned an 'Aeroelasticity' analysis job at my workplace. In an effort to imbibe the fundamental knowledge which'...
Rameez Ul Haq's user avatar
0 votes
2 answers
333 views

Trying to understand this pressure distribution over an aerofoil?

can someone please help me understand why the pressure is like that over the top and bottom surface of this aerofoil please? Also, what do the arrows point out mean? Why are the front and end ones ...
FlightWatcher's user avatar
1 vote
2 answers
141 views

How to measure chord on a rounded trailing edge airfoil?

So, should I measure it by the rearmost point (in contact with the tangent line) or the point coinciding with the end of the camber line (represented by the line starting at the circumference center)?
Josue's user avatar
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0 votes
1 answer
155 views

Can someone help me understand this aerofoil?

I came across this morphing aerofoil, but don’t understand how it works please? Can someone explain also what the components are, like that box in the left? I looked into that reference, but it’s a ...
Warrick's user avatar
1 vote
2 answers
124 views

Is there an aerodynamic benefit of covering the underside of wings?

What is the nature and extent to the benefit of covering up the bottom of an airfoil? It seems like all the early airplanes just had ribs and spars that were wrapped only on top, but then pretty soon ...
stuart's user avatar
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2 votes
3 answers
393 views

How does increasing camber increase lift coefficient?

How does increasing the camber of an airfoil (like the NACA 0018) increase its coefficient of lift? You're just curving the airfoil; I don't see how that increases lift for a given angle of attack?
MichaelK's user avatar
1 vote
1 answer
702 views

How to know what kinds of airfoil being used in a commercial propeller?

Suppose we know the 3D CAD model of a commercial propeller. Starting from that, we do the slicing to get the profile of airfoil being used to generate the complete shape of the propeller. How do we ...
IFX21's user avatar
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0 votes
4 answers
2k views

Center of Gravity, Aerodynamic Center and Center of Pressure, how do they connect?

I read an article that described static margin by taking the aerodynamic center and the center of gravity. It explained why the center of gravity has to be in front of the aerodynamic center for a ...
Latex User 101's user avatar
0 votes
2 answers
289 views

Short Take Off and Landing, and Range

Can a plane have good range with a short take-off and landing (STOL) capability? If not, why. I have noticed STOL planes with lack the better good seat miles per gallon of planes that need longer ...
Justintimeforfun's user avatar
1 vote
1 answer
193 views

Can a 747 airfoil be scaled down for smaller jet planes?

At the loss of its acrobatic ability, could an airfoil similar to the 747 be downsized to allow a small jet to climb higher and extend its range? This plane with its wing profile is highly acrobatic, ...
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