Airplane Stalls - KING SCHOOLS Video

[TheMeslava]

@hen555 in FSX try pulling back ALL THE WAY at once, it will stall fast and not climb at all (pretty much), that's because you hit that angle of attack. And remember, it's a flight simulator... it's not a real plane. Yeesh.

[hen555]

but wait... if the speed is fast of the air particles, cant you have a higher angle of attack before stall? I mean in my testing on FSX, I can make an airplane almost vertical and still gain altitude until the speed decreases then I stall. My guess would be that although I am at a high angle of attack... there is no lift generated and the propulsion from the engine is giving it altitude...not bernouli's principle. Someone care to explain ?

[KarpatycGhost]

@hen555 I think...( just a opinion ) as you raise the nose of the plane and increase the angle of attack the plane also changes the direction of flight and as the plane starts to travel upward as well the relative angle between the air flow and the wing stays within the limit .... unlike in the video where theoretically the wing has increased the angle but still appears to be travelling in the same direction .... I would need to do a diagram of vectors to explain it better ...

[Nippon1971]

May I ask you if the 2D or the 3D is more effective in generating lift ?

[obaidCarkey]

so low speed and high angle of attack is a NO NO?

[majfunkmeister]

@obaidCarkey correct, if u increase angle of attack, u will lose airspeed.

[sporkninjaa]

@obaidCarkey Absolutely. Then your plane falls out of the sky.

[DanFrederiksen]

I assume it depends on speed too?

[fs10inator]

Marvin Renslow pulls the control column when it stalls.

[RoboTekno]

He uses the same hand movements Billy Mays used

[TrowaTrey]

It's really designed in to the "wind, into the wing"..LOL

[Helicopterpilot16]

The problem I see with this video is they are talking about accelerated stalls not stalls we are use to, they are putting the cessna wing into a consant speed of air and increasing AOA till the wing stall, in this case over loading the wing. In real life of course the plane is going to climb because of more lift, slow speed stalls we need to increas aoa because of a loss in the lift then once the angle gets above 18 degrees is seperates.

[VIR092]

King Schools is the very leader and best in flight instruction. John and Martha are the greatest in the industry!

[ElroyHarvey]

In this video the air is flowing horizontal from left to right, if the aircraft was flying upwards at an angle of say 45 degrees from level would the airflow not be flowing horizontal from left to right but down at an angle of 45 degrees so the airflow would still be zero degrees to the angle of the wing? Hope you understand what im trying to say.

Cheers Lee.

[TheFr3sh1]

@ElroyHarvey yes you are right.

Angle of attack is based on relative wind.

So if the airplane is flying 45 degrees up, maintaining speed and everything, the angle of attack could be very small - not 45 degrees

[rossiQA]

He is right. An aircraft always noteALWAYS will stall at a particualar angle of attack. U can stall in straight and level flight ie if not enough speed to generate the lift at the critical angle or say if a gust of wind comes along the stall warning will come on. YES ANGLE OF ATTACK DOES NOT VARY WITH WEIGHT BUT THE STALL SPEED DOES IN MANUALS U HAVE A STALL SPEED GIVEN TO U BASED ON SET CONDITIONS IE MAX WEIGHT FLAP UP ISA ETC AND IT WILL VARY IF THE CONDITIONS OF THE AEROPLANE ARE DIFFERENT

[emmanuelmaggiori]

What about speed and air density?

[TheAviator57]

Those two don't affect stall speed and critical angle of attack.

[MrQuuem]

@emmanuelmaggiori Speed and air density are put together in a quantity named Reynolds Number. For a consant Reynolds Number, the wing stols at a certain angle. If you change Reynolds, either by changing the velocity or densitym the angle may also change.

[straighttailpilot]

@emmanuelmaggiori it doesnt matter. it will always stall at the same angle of attack. no matter of weight air density turbulence tailwinds or anything like that. although some of these things do change the speed of which a wing stalls for example weight. it will stall sooner but at the same angle of attack.

[fokkerairbus]

@straighttailpilot IT DEPENDS OF SPEED ALSO ,, I MEAN ,AN AIRPLANES CAN ALSO GET A STALL CAUSE OF LOW SPEED ,, THIS (STALL SPEED) CAN ALSO BE MODIFIED WITH FLAPS ,,,,,, AND FOR STALLS FOR HIGH ANGLE OF ATTACK ,, YOU CAN MODIFY THE STALL ANGLE WITH SLATS

[jofus2019]

@fokkerairbus It has nothing to do with speed. An aircraft always stalls at the critical angle of attack. So that means an aircarft can stall at 40 kts. or 500 kts. etc..

[AlevliTurkGs]

@emmanuelmaggiori

airplanes stall at same angel of attack in all situations

[superhornet59]

@emmanuelmaggiori neither is (in most atmospheric sub-transonic speed situations) important. It's the velocity vector that counts.

[thepod24]

@emmanuelmaggiori An airplane can stall at any airspeed and any air density

[yoshua4]

i have the newer version for the cessna 172

its in color!!

plus he dont have the 80's look

[siccunte]

lift is not destroyed at the stall, it is only reduced somewhat.

what about the explanation? "when you get the angle of attack so high, the air can no longer conform to the surface of the wing"

wtf is that. air conforming? why can't it "conform" is the question he should be answering.

[slashsound]

I'm an aerospace engineer. Guys, this is wrong...you can stall at any speed and at any angle of attack

[LTF85199]

for a given constant speed you should add.

[martinezsuastegui]

for a given Reynolds number you should add.

[zeroMPUA]

@LTF85199 Perhaps, you wanted to say for given similaruty parameters, as Mach number, Reynolds number, Struchal number, etc.

[yoyaya007]

@LTF85199no he doesn t have to ad that in engineering the angle of attack is more significant, never say for a constant speed (stall is not related directly to speed)

[paranoidandroid1995]

but that doesnt show that the aircraft (at a good speed) is moving in the direction the wing is pointing (this shows it that the plane is moving horizontally and not changing altitude with the increase in lift).

[pat6270]

John King rules.

[Omid45]

that's wrong!! angle of attack changes with the weight, since a heavy plane needs to already be at a higher angle of attack to support the extra wight. I gues it's still the same though, it will only stall faster!!!

[MustangLori]

duh, my brain hurts?

[friskola]

great instruction mr king!

you are great!