Questions tagged [stall]
A stall is an aerodynamic condition wherein the angle of attack of a wing increases beyond the "critical angle of attack", causing the wing to cease generating lift.
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Is washout a twist up at the root or a twist down at the tip of the wing?
Does washout/in take place at the root of the wing or the tip? And is the twist distributed evenly along the wing, or is it only twisted for a portion and level for the rest, specifically in ...
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Why will the pressure distribution of a swept wing promote stall?
Here it explains how the bound vortex will change the lift distribution of a wing. What is meant by the lift distribution changing is that there is less lift at the tip, meaning the pressure ...
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A question on stalling and flat spin - in gliders
Very short version: Do gliders do stalls, and flat spins, as aerobatic tricks (as do say aerobatic biplanes).
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As I understand it, with an aerobatic plane, a pilot can and does, for "fun" ...
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Whats the derivation of a low speed ratio for stall warning?
I've seen an equation related to stall and angle of attack in a few places like this patent that goes more or less:
$$ \frac{CAS_{alert}}{CAS_{current}} = \sqrt{\frac{C_{L,current}}{C_{L,alert}}} $$
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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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Can partial flow separation make the effects of Reynolds number on stall more significant?
While discussing this stall differences with altitude question with a skydiving canopy designer, I told him that most people seemed to think Reynolds would not be significant at these altitudes.
His ...
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Conundrum about designing a glider relating to coefficient of lift
I'm designing a high-altitude glider. Just to clarify a few points before my question:
The glider will weigh close to 200 grams.
It will be using the A18 airfoil.
The glider is dropped from 80,000 ...
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Comparing a Flight In Turbulent Conditions At Va And Vb
First, let's cover definitions for both airspeeds:
Turbulence penetration airspeed (Vb) is the design speed for maximum gust intensity (i.e. the intersection between the 66 fps gust line and the ...
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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 ...
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Why does the wing drop prior to a spin?
In the process of understanding the aerodynamics of spins, I'm having a hard time understanding why one wing drops.
I understand that the for spins to occur, a stall + a yaw must occur. I also ...
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Is this the correct functioning of a reed type sensor in a stall warning system?
I understand that this type of system works based on suction. According to what I read, at angles close to the critical angle of attack, the pressure near the leading edge is very low, this generates ...
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Is it okay to do power off stalls in the clean configuration for a check ride?
I’ve been renting a plane for a while and the owner has asked due to a safety concern that we don’t use flaps in our stalls or slow flight.
The airplane flying handbook and the ACS call for these to ...
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Why Critical Angle of attack doesn't change with an increase of IAS/TAS?
I am trying to understand this topic that is not letting me sleep. I am a private pilot and I am studying for the CPL, if someone could give me a simple explanation of this I would be very grateful. ...
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What is the mathematical relationship between mass and speed for constant thrust in level fight?
Imagine that we have a wing with constant thrust in level flight. Then imagine that we add mass to that wing. In order to maintain level flight, I would expect that the angle of attack would need to ...
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Use twist to improve stall characteristics in ideal distribution of lift coefficient
Is practical use twist (geometric or multiple airfoils to improve stall characteristics) when it has lift coefficient distribution ideal or near due to wing plataform?
I am analyzing a "Schuemann&...
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