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The 2D shape of a section of aircraft wing.

3 votes
Accepted

Does the pressure recovery become not as extreme as you speed up?

From potential flow theory we know that the pressure distribution over an airfoil is the linear combination of lift due to angle of attack plus lift due to camber. …
Peter Kämpf's user avatar
3 votes
Accepted

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 No, you don't. Lift is determined by camber and angle of attack. … New comment after the editing of the question: The airfoil you show is by no means a standard wing airfoil. It looks more at home in a gas turbine. …
Peter Kämpf's user avatar
10 votes
Accepted

Why are supercritical airfoils not used in GA aircraft?

Actually, Whitcomb's GA airfoils were based on experience gained with supercritical airfoils. They share the large leading edge radius and the strong rear loading with them. Other than that, suppressi …
Peter Kämpf's user avatar
5 votes

Is the ideal airfoil concave on the underside?

Also, birds do not have to deal with trans- and supersonic effects which dictate the airfoil shape of almost all jet-powered airplanes. … This is achieved by reduced camber, and the result is a convex bottom surface: A symmetrical airfoil has no pitching moment variation within the linear range of angles of attack. …
Peter Kämpf's user avatar
2 votes

Moving from 2D wing to 3D wing design

An aerodynamic engineer would maybe strive for an elliptical circulation. But not an airplane engineer. In 1933 Ludwig Prandtl published "Über Tragflügel kleinsten induzierten Widerstandes" in the Zei …
Peter Kämpf's user avatar
2 votes
Accepted

Are winglets symmetric airfoils? (Cessna Citation M2)

It is not unreasonable to continue into the winglet with the wing tip airfoil. … This can both be done by cambering the winglet airfoil and by selecting the proper winglet incidence. …
Peter Kämpf's user avatar
2 votes

P-8A Poseidon Airfoil type

But that does not mean that a symmetrical airfoil is the best choice for a maritime surveillance airplane. Far from it! … The wing of the P-8A is based on that of the Boeing 737-900, and you can be sure that the airfoil is the same. …
Peter Kämpf's user avatar
1 vote

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

XFOIL gives you several options, however, the X and Y axes will always be angle of attack or a coefficient. You can, for example, choose a Reynolds number (Re) which is variable with lift coefficient, …
Peter Kämpf's user avatar
1 vote
Accepted

Aerofoil selection for a Horizontal turbine

Given the low end of your very wide speed range, your airfoil should have very low thickness and high camber, similar to a bird wing's airfoil. … The S807 also mentioned is a root airfoil for the blade of a wind turbine and has its high thickness for structural reasons. …
Peter Kämpf's user avatar
1 vote

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

Plot the airfoil on a piece of paper, glue that to a piece of cardboard and cut it out. The shear center is where the center of gravity of that cutout airfoil is when balanced horizontally on a pin. … to use more material in some corner (say, a torsion box forward of the spar), increase the thickness of the cardboard proportionally to the relative shear stiffness of the corresponding section of the airfoil
Peter Kämpf's user avatar
1 vote

Can wingtip vortices formed around an unswept wing produce vortex lift?

Wikipedia calls it a bit more soberly a fully controlled, completely stalled parachutal descent mode which was made possible by the airfoil shape. …
Peter Kämpf's user avatar
4 votes

Flying wing airfoil

Used as a root airfoil on the DfS 94 and 194 (aka Me 163 A). The root airfoil on the Me 163 B was 0.4% thinner, but otherwise very similar. …
Peter Kämpf's user avatar
1 vote

Wind turbine airfoil on low Reynolds number aircraft

Do not take the origin of an airfoil as a criterium for its selection. Judge it purely on its merits for the intended purpose. If a wind turbine airfoil gives you better L/D than any other, use it. … Thermalling: The airfoil should allow for a small sink speed at low flight speed. Low structural mass and a high lift coefficient are the most desirable traits here. …
Peter Kämpf's user avatar
9 votes

What specific improvements were made in supercritical airfoil design from 1980 - 2000?

While initial research focused on avoiding a shock completely at one specific operating point of the airfoil (Phase 1, in the 1960s), Phase 2 airfoils accepted weak shocks for the benefit of a wider angle …
Peter Kämpf's user avatar
3 votes

The Effect of Pitching Moment on Aircraft Stability

Camber in the main wing airfoil means that the wing's center of pressure will move forward with increasing angle of attack (AoA). … Now it might seem that a large, negative c$_m$ causes more drag from the larger tail surface when you compare the same design with an uncambered wing airfoil, but camber will also allow the wing to reach …
Peter Kämpf's user avatar

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