Linked Questions

5
votes
2answers
5k views

What exactly is a variable incidence tailplane?

I've been reading about it regarding trim changes and such, but I don't exactly know what a VIT is? Can someone explain that to me?
8
votes
1answer
3k views

How are condensation cones created by supersonic airplanes?

There are many awesome pictures of this phenomenon such as this one: What is the physical explanation of how this occurs? Does it occur only when the airplane crosses the sound barrier or does it ...
7
votes
1answer
4k views

How can we determine the maximum camber and thickness for airplane wings?

I want to know if there are any standard factors for determining maximum wing camber and thickness for heavy and light airplanes? I'm using an optimization process to find the best wing shape to ...
3
votes
2answers
850 views

Why is the critical AoA of most flaps 40° when most airfoils stall at 15°?

A plain flap deflected 40 degrees is largely stalled (...) Flaps stall at 40° according to an answer on Quora, why is this so when typical airfoils stall at 15°?
3
votes
3answers
598 views

how does recovering a plane from stall lead to exceeding the critical mach speed?

Recovering from stall itself states that the aircraft is below stall speed. So how does recovering from that stall lead to exceeding critical mach.
2
votes
1answer
5k views

What causes the adverse pressure gradient that leads to flow separation?

When reading about flow separation I generally see a diagram like this: imp source: Wikimedia commons This shows that the boundary layer slows as it passes over the wing, eventually creating an ...
6
votes
2answers
666 views

Which design method is used for super critical airfoils?

How is an Airfoil categorized as super critical or not super critical? What are the ways to design a super critical airfoils?
1
vote
4answers
516 views

Explained intuitively, why does aspect ratio affect induced drag?

Over the last few hours, I've been trying to intuitively understand induced drag, and how aspect ratio affects it. I already know the equations, but while they explain the relationship, they do not ...
4
votes
2answers
2k views

Stalls: which flight control surface is effective last?

In an aerodynamic stall, which flight control surface (limited to ailerons, elevators and rudder) remains effective for the longest period of time during the stalling condition? In other words, which ...
5
votes
1answer
658 views

What's the theoretical background of the critical angle of attack?

The critical angle of attack seems to be at all (most?) airfoils around 15-20°. Why is that? Why is it in this range and not lower or higher? Is it just the result of optimizing airfoils? Or is it ...
6
votes
1answer
300 views

How does a delta wing deal with supersonic boundary separation?

The question Why most of the supersonic or fighter aircraft use all-moving control surfaces? emphasis the importance of all moving stabilator for supersonic aircraft. Many supersonic aircrafts ...
1
vote
1answer
1k views

How to find the static stall angle of attack for a given airfoil at given Re?

For vertical axis wind turbines applications I'm wondering how one would find the static stall angle of an airfoil at a given Reynold number? Is it just the critical angle of attach (AoA) where ...
6
votes
1answer
285 views

How is flow separation related to the chord length of an airfoil?

I came across this question while studying stalling of airfoils. How does the chord length of an airfoil affect the position of the separation point of flow? https://en.wikipedia.org/wiki/...
2
votes
1answer
525 views

Why does the effective alpha/CL increase at wingtip of swept wing?

If anybody could explain this in an intuitive way I'd really appreciate it. I haven't been able to find a clear answer on this. I understand that the increase in effective AoA/CL and the spanwise flow ...
5
votes
1answer
198 views

What happens when the surface ends at the laminar zone of the boundary layer?

When a body travels through any fluid, due to viscosity of the fluid a boundary layer is formed around the surface of the body which separates the velocity of the fluid inside the boundary layer(near ...

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