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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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 ...
Charles Nicholson's user avatar
5 votes
1 answer
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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 ...
Darjan's user avatar
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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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2 votes
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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 ...
Alex Gallegos's user avatar
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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 ...
Pilot 1's user avatar
4 votes
2 answers
195 views

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. ...
Alex Gallegos's user avatar
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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 ...
Monty Wild's user avatar
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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&...
andy's user avatar
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Trailing edge tapered and leading edge straight

It is true that a wing with a straight leading edge and a tapered trailing edge has good stall characteristics?. That is, we can assure that when it enters stall, it will first be at the root and then ...
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Effect of wing flexible in stall

How true is it that the deflection (due to large aspect ratio, flexible wing ) of a wing has a certain effect on the stall characteristics? I read about this in the case of large wingspan gliders. ...
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Does AOA become 0 after the aircraft flies in a particular attitude for sometime as the relative airflow has changed and how does it affect Stall AOA?

As AOA is the angle between relative airflow and Chord Line. Then after you increase the angle of attack and fly at that angle of attack for some amount of time and the relative airflow changes ...
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Why does stall warning system require 4 minutes of AC power on the 737NG?

Is it related to the Stall Management Yaw Damper (SMYD) computers starting? But the number 1 stall test is working with no need for waiting. Please provide sources, if available.
Adel Refa'i's user avatar
12 votes
2 answers
3k views

How should you deal with passenger throttle interference just after take-off?

I took a passenger on a flight recently in a C42, in which the throttle is placed between the legs. Shortly after take-off (I'm talking 100ft in the air at full throttle), the passenger tucked his ...
Cloud's user avatar
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Confusion about center-of-lift vs center-of-gravity [duplicate]

As usually depicted, in a small aircraft (maybe larger commercial ones too), the lift due to the main wing (excluding the elevator) is depicted as on average aft of the center of gravity, with the ...
Foster Boondoggle's user avatar
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Is the interpretation of "54 knots CAS at the aircraft’s maximum certificated takeoff weight and most critical center of gravity" subjective?

The newly proposed MOSAIC regulations state in § 61.316 (1) A maximum stalling speed or minimum steady flight speed without the use of lift-enhancing devices (V S1 ) of not more than 45 knots CAS, ...
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Why does changes in load factor affect the stalling speed? [duplicate]

Why does changes in load factor affect the stalling speed? Is it because with an increase of load, the airplane has to fly at a faster airspeed to maintain performance because of the weight it has to ...
youngpilot's user avatar
2 votes
1 answer
424 views

Are there any stall warning apps available?

Recently I was flying a 500ft circuit, when in the downwind leg I felt a buffeting, when I looked at my ASI, to my horror, I was at stall speed. I recovered without incident, (recover might be an ...
Cloud's user avatar
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What are the advantages and disadvantages of a low stall angle?

One advantage I can think of is when we increase the wing's angle of incidence to decrease fuselage drag and increase takeoff lift, but would higher stalling angles always be better in terms of flight ...
Luan Arita's user avatar
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Other than training and some landings, do pilots ever stall on purpose?

Other than in training/practice and some landings, do pilots ever intentionally stall?
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Helicopter hammerhead-like maneuver

A response to a previous question indicated, “In a helicopter, aft cyclic (“pitching up” in a plane) will only serve to make the helicopter climb and slow down until it reaches equilibrium in the new ...
Bill's user avatar
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Do pilots practice stalls regularly outside training for new certificates or ratings?

I know that stall practice in real aircraft is part of PPL training, and that airline pilots training for type ratings practice stalls in simulators. After obtaining a certificate/type rating, do ...
Someone's user avatar
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Stall on low airspeed with high power on right-turning propeller

Q: The pilot of an aeroplane with a single engine and right-turning propeller (clockwise from the pilot’s viewpoint) decides to go around. The pilot raises the nose too much as the power increases and ...
Filip Adam's user avatar
3 votes
1 answer
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Why would a ram air parachute need less brake input to stall at a higher altitude?

I have some anecdotal evidence that a ram air sport parachute requires less toggle input to stall at higher altitudes. A pilot needed one wrap of the brake lines around the hands to quickly, ...
Oleg's user avatar
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Why is the A330/A340's alpha-floor protection disabled above mach 0.53?

One of the A330/A340's several means of flight-envelope protection is something called "alpha floor" protection. In essence, if the aircraft's angle of attack is excessively high, TOGA ...
Vikki's user avatar
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Can I identify wingtip stall by looking at the lift distribution?

I'm projecting a wing in XFLR5. The lift at the tip of the wing looks like it's dropping very quickly close to the stall angle, so I think there may be wingtip stall, however, is there any way I can ...
Luan Arita's user avatar
5 votes
1 answer
210 views

Effect of leading edge contamination wing performance

When a wing accumulates irregularities such as insects or dirt on the leading edge, its performance decreases. There are two main effects of this which are explained in https://aviation.stackexchange....
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Literature request for effect of Aspect Ratio and Wing Sweep on critical angle of attack?

So I'm trying to find academic literature detailing how both aspect ratio and taper ratio affect the critical angle attack of an aerofoil - namely for a v. low AR wing (AR<1), and high sweep (~75 ...
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How would I go about finding stall/loiter speed data?

I have a list of 6 fixed-wing and 2 tilt-rotor aircraft that I require the stall and loiter speeds for, however I have great trouble finding these. Is there a book or website that has an extensive ...
Daniel Giffin's user avatar
1 vote
4 answers
309 views

Is it normal to fly or glide only one mile per hour above stall speed?

At one point, Through Gates of Splendor describes Nate Saint gliding in his Piper PA-14 Family Cruiser at 45 mph; the plane's stall speed is 44 mph. Earlier in the book, he flew at 45 mph. Is it ...
Someone's user avatar
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1 vote
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How is a stall different from a spin?

Is a spin a by-product of a stall? So if a airplane stalls is a spin guaranted sooner or later?
Zach Barker's user avatar
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1 answer
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Sudden "nose-down" event during a normal flight in normal weather conditions

I had a flight scheduled from WAW to KIV on LOT airlines. The boarding pass told they changed the aircraft to a 737 MAX. When I saw that I've immediately remembered that whole MCAS story from 2018. ...
Denis Rimskii's user avatar
7 votes
5 answers
3k views

Under what conditions do airplanes stall? [duplicate]

I've seen somewhat conflicting information on when planes stall. I've seen references to "stall speed," apparently a speed below which the airplane will stall, but stalling also seems to be ...
Someone's user avatar
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8 answers
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Why do airplanes usually pitch nose-down in a stall?

Why do airplanes usually pitch nose-down in a fully-developed stall? I've seen this seemingly-simple question discussed on other aviation forums, but there doesn't seem to be a single agreed-upon ...
Ethan B's user avatar
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16 votes
4 answers
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Is it possible to avoid vomiting while practicing stall?

I found that even after 30 flying hours in a Cessna, my body still cannot tolerate practising stall, thus throwing up and dizziness follow up after the sorties. Is there any way I could prevent that?
Izzuddin Cheras's user avatar
2 votes
2 answers
351 views

How deliberately stall fixed wing reduce drag if stall decrease static pressue? [closed]

In this VIDEO at 5:40 we can see how stall decrease pressure at upper wing surface. If stall/flow separation reduce static pressure how in this VIDEO they reduce drag when stalling the wing? Here is ...
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4 votes
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Could a F-22's exhaust stall a highjacked Boeing 767's turbofan(s) and force it to land?

Would it be possible to use a F-22's exhaust to intentionally stall a hijacked Boeing 767's turbofan engines in order to force it to land instead of shooting it down? The idea being that stalling one ...
Kim deDonado's user avatar
1 vote
1 answer
535 views

Does Indicated Stall speed increase with altitude (Coffin Corner)?

It is my understanding that Indicated Stall speed is mostly constant with altitude, the one that increases is True Stall Speed. Given that PFD show speed as IAS, how come the yellow speed range ...
Max the head's user avatar
1 vote
1 answer
433 views

How does camber affect on critical aoa?

i am pretty clear about why a higher camber would increase Clmax, but critical aoa. one of the resources i read the graphic shows a greater chamber near the leading edge will increase Cl at different ...
master olof's user avatar
8 votes
2 answers
2k views

Is a plane stalled during landing rollout?

IMAGE SOURCE: https://pilotinstitute.com/wp-content/uploads/2022/01/Parts-of-a-Wing.jpg As the lift dumpers are extended on landing they cause the air to move away from the wing. Also as the flaps are ...
Aviation Enthusiast's user avatar
2 votes
1 answer
88 views

What are some features of a wing, which effects its lift coefficient other than its sectional view? [duplicate]

What geometrical features of a lifting surface apart from which airfoil it has, I mean the ones visible from the top and front view of a wing (for ex: its span, AR, sweep, dihedral etc.) effects its ...
Kozakov's user avatar
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4 votes
3 answers
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Which wing stalls first in a level coordinated turn?

I was told that in a level coordinated turn the inside wing stalls first because it has a higher angle of attack (AoA). Now, I have always thought that in a level coordinated turn, the wings must have ...
cluelessneedhelp's user avatar
8 votes
2 answers
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Will the autopilot raise the AoA above the critical AoA to maintain altitude?

NOTE: This question is regarding commercial airliners (eg: Boeing 737, Airbus A320, etc.. This is for any given configuration of the aircraft) Will the autopilot raise the AoA above the critical AoA ...
Aviation Enthusiast's user avatar
3 votes
4 answers
567 views

Can a plane still climb even if it has exceeded the critical AoA?

According to this answer here, an airplane requires less lift for a climb than horizontal flight because the thrust of the engines will point up. Now if the wing was in a stall condition, could the ...
Aviation Enthusiast's user avatar
-2 votes
1 answer
103 views

Stall speed requirement [closed]

I calculated my stall speed at 22m/s. For this stall speed, would it be a better idea to increase it to use in my calculations later on or leave it as it is? I thought increase it a little to be on ...
Air guy's user avatar
1 vote
1 answer
159 views

Can vane delay flow separation? [closed]

In general is a slat better than a vortex generator to delay flow separation, for high AoA or extremely curvature wing/objects? Does this "roof vane spoiler" works same as slat at wing, ...
user707264's user avatar
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What is max angle of surface without stall?

AoA is by defintion angle between choord line and airflow, here is 25°. But max effective AoA here is 60°, so flow will separate for sure here.. What is max lets call it "effective AoA" that ...
user707264's user avatar
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-1 votes
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The stall velocity condition: Exactly what is stall velocity? [closed]

Question: if my stall velocity is 20m/s, then... If the airplane is travelling at a velocity greater than or equal to the stall velocity, can one assume the plane will not stall? Can one assume that ...
Jimmy Conor's user avatar
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3 answers
425 views

What is the AeroVironment Helios' Kármán line?

If it's true that the NASA/AeroVironment Helios maintained level flight 96,000 ft above sea level at a maximum airspeed of 23.5 kts (43.5 km/h) I assume it must have a very high Kármán altitude, the ...
Better not tell's user avatar
0 votes
1 answer
143 views

Attack angle in high speed [closed]

I found the above animation; the moving slow air (or wing) will hardly to lead to an aerodynamic stall, but the usual case is a plane in the air running much faster than the animation, so does the ...
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