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AOA during Stalls in Europa XS N228FT
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Пікірлер
@PilotReidB
@PilotReidB 37 минут бұрын
Working on my CFI and honestly, these have scared me on the two times I tried them. I think this video just massively satisfied that safety need
@BonanzaPilot
@BonanzaPilot Күн бұрын
I can stall an airplane without the yoke being full aft
@sebjebofficial6230
@sebjebofficial6230 Күн бұрын
What about trim? Using the yoke is a very indirect indicator or AoA
@excellenceinanimation960
@excellenceinanimation960 Күн бұрын
I heard Harris hill on the coms! Wonderful place!
@martinottaway2044
@martinottaway2044 2 күн бұрын
In your demonstration of pulling the yoke all the way back to its stops I noted that it moves up at the end of its travel instead of just coming straight back. I have a couple of questions about that; what is the reason or design philosophy behind that movement, and how mechanically do they accomplish this behind the panel?
@chucklemasters6433
@chucklemasters6433 2 күн бұрын
have you ever done a spin sir? bring your power up to about 2000 rpm or more and keep the nose wings level nose straight ahead with no rudder and all right aileron and it will spin like crazy! do you know what happens after the third turn? do you know what happens in a spin with a fata$$ in the back seat? your theory on measuring AOA with the distance the yoke is pulled back is about the lamest thing i have ever heard! why does the left wing stall with full right aileron?
@chucklemasters6433
@chucklemasters6433 2 күн бұрын
god help your students!
@mrmr314
@mrmr314 5 күн бұрын
Why is there a natural tendency for the aircraft to turn to the left?
@New2Me170B
@New2Me170B 4 күн бұрын
Because the prop turns one direction.
@SAFEPilots
@SAFEPilots 4 күн бұрын
@@mrmr314 there are four major forces, pulling the plane to the left: www.boldmethod.com/learn-to-fly/aerodynamics/why-you-need-right-rudder-on-takeoff-to-stay-on-centerline-during-takeoff/
@birds_eye_view
@birds_eye_view 6 күн бұрын
It depends on so many other factors as well. So no, the airplane does not necessarily stall, when you pull the yoke or stick all the way through. It also depends on the trim setting, the current power, weight, CG and speed. You can stall with just a little pulling the elevator, even full forward elevator might stall, see a runaway trim all tailheavy. Also you can pull all the way to the edge and not stall at all. But in fact that statement from the title IS true. Every airplane will indicate to you when a stall is impending - stallhorn, speed indicator, buffeting, sluggishness of controls.
@chucklemasters6433
@chucklemasters6433 2 күн бұрын
trim setting has NOTHING to do with stalling. stop looking at the glass panel and look out the window at the nose and horizon. that is your built in and very inexpensive AOA.
@birds_eye_view
@birds_eye_view 2 күн бұрын
@ When you make a statement like that, you should really explain yourself there. Why do you think trim has no factor in stalling? Why do you think pitch is an AOA indicator? And what does it have to do with glass panel?
@SierraBravo7970
@SierraBravo7970 6 күн бұрын
Great video however you never demonstrated the most dangerous, cross controlled stall. There are 2 types of cross controlled stalls. 1) Slipping 2) Skidding You’ve demonstrated 1) stalls in a coordinated bank 2) Slipping Stall You never demonstrated the skidding stall. Example: in an attempt to not over bank in the turn from base to final so you cheat with rudder. I guarantee you if you would’ve demonstrated that now matter what aircraft it’s gonna be dramatic.
@jasonMB999
@jasonMB999 8 күн бұрын
But your ah already indicates your angle of attack. The yoke stick does not tell you anything
@JJFHNREHJEDK
@JJFHNREHJEDK 7 күн бұрын
Your AH shows your pitch attitude. This is NOT the same as Angle of Attack. A given pitch attitude can result in a varied AoA depending on your speed, energy levels, etc. Imagine you are in flight with your nose pitching up slightly. Imagine you let your airspeed decay and you enter a stall, holding the same pitch. Your AH will show the same pitch attitude, but your AoA will have had to increase, as it has now gone beyond the critical AoA - as that's the definition of a stall.
@jasonMB999
@jasonMB999 7 күн бұрын
@@JJFHNREHJEDK 😆lol. And how will your speed decay? If you you can answer this you will solve the confusion you've created for yourself....
@txkflier
@txkflier 6 күн бұрын
The AH only shows the attitude of the plane relative to the Earth. A plane can have an angle of attack of zero while going straight up or straight down. It could just as easily have an angle of attack of 15 degrees. The AH won’t tell you the angle of attack in either case.
@tomdchi12
@tomdchi12 8 күн бұрын
A simple principle I’ve never heard stated: in coordinated flight lift on the wings is equal. A nice “why” behind keeping coordinated.
@Greggg57
@Greggg57 8 күн бұрын
Slip in, skid out.
@GeraldToth-ph1ns
@GeraldToth-ph1ns 8 күн бұрын
Are you a real pilot? I‘m not sure dude
@SAFEPilots
@SAFEPilots 6 күн бұрын
Yes, for the last 50+ years. A lot of commenters here are mistaking AOA with airspeed. Full back yoke canstall the plane at cruise airspeed. This is how you create a snap roll (a horizontal spin). The plane is stalled in level flight (and you can also stall pointed straight down). AOA does not correlate with airpseed (it is "invisible")
@cptinsano43
@cptinsano43 9 күн бұрын
Why argue against a modern safety instrument while also glossing over what "critical angle of attack" actually means? Worst case; its redundant but the alternative is that it saves lives.
@aero3085
@aero3085 11 күн бұрын
So if I’m in a 45 degree bank I won’t stall unless I pull all the way back to the stop? Careful what you believe on the internet people, it could kill you.
@warren5699
@warren5699 8 күн бұрын
Have you ever tried it? When I demonstrated accelerated stalls or approach to accelerated stalls, I would bank 45 degrees, hold altitude, and gradually reduce speed. The stall warning would always start 10 to 15 knots above the bottom of the green. I usually didn't take it any further because by then it already required an enormous amount of back pressure because of the forces in the turn and I didn't want to over-stress anything. But if we had kept slowing and increasing back pressure, I think the stall would have very closely coincided with full rear position of the control wheel.
@jasonMB999
@jasonMB999 8 күн бұрын
Well, you shouldn't just stall at 45 degrees, that is not an angle of attack.
@warren5699
@warren5699 8 күн бұрын
@@jasonMB999 But that's what happens to pilots when maneuvering as in the base-to-final stall spin. It's part of the training to avoid loss of control.
@warren5699
@warren5699 8 күн бұрын
@@jasonMB999 Accelerated stalls are covered on pg 5-19 of the Airplane Flying Handbook where this is noted: "This is a maneuver only commercial pilot and flight instructor applicants may be required to perform or demonstrate on a practical test. However, all pilots should be familiar with the situations that can cause an accelerated stall, how to recognize this type of stall, and how to execute the appropriate recovery should one occur. "
@jasonMB999
@jasonMB999 8 күн бұрын
@@warren5699 that's not at all what happens to pilots on final. You're not even supposed to to final at 45 degrees, the setting of your plane does not allow that.
@flyingconsultant
@flyingconsultant 12 күн бұрын
You’re flying a Piper with a tapered wing. I have PA28-181 and it is very difficult to get it to spin. Normally it just leaf-stalls down and nothing really happens. That is not the case with all airplanes. Generalisation is the problem here.
@SAFEPilots
@SAFEPilots 6 күн бұрын
This is a demonstration intended to show the stability of a slip (you have to understand what this is - NOT a skid!). In a slip yaw opposes roll and every trainer I have tried at idle power preforms exactly like this: stable. My 7AC Champ (tailwheel with huge rudder) will spin "over the top!" IF you add any power in a GA trainer this same result: the airflow from the prop over the rudder provides more force and spins "over the top." But at idle power: stable.
@warren5699
@warren5699 12 күн бұрын
Tough subject, David. I agree with your analysis. Unfortunately, I think problems generally occur when the pilot is overloaded and isn't aware of the position of the pitch or the control wheel, possibly when fixated on the runway base-to-final. What we need to include is realistic training scenarios that can regularly occur and which substantially increase the workload of the pilot with the objective that the pilot accomplishes the scenarios without any loss of awareness of the airplane's condition and margin of safety above any loss of control.
@SAFEPilots
@SAFEPilots 4 күн бұрын
@@warren5699 Scenarios and “overtraining” to the level that recovery is automatic! (Few pilots get to that level) I was in a level D simulator with a PIC Jet captain, who stalled the plane and held it all the way into the ground(red screen!) he is a very experienced pilot but panicked and froze up - amazing!
@warren5699
@warren5699 3 күн бұрын
@@SAFEPilots Oh no. That reminds me of Air France 447. Do you think that the custom of powering out of the stall in jets contributed? That's not done any more, correct?
@flyingfox8360
@flyingfox8360 12 күн бұрын
My CFI wanted to see turning stalls and cross control stalls immediately, not because they're specific to training, but because it built confidence in learning to reattach the wing to the relative wind! Awesome video.
@SAFEPilots
@SAFEPilots 6 күн бұрын
Thank you. I did this demonstration at my flight school with every pilot headed to the practice area. They have to be comfortable with "stall series" first. They the CFI demonstrates coordinated turning stalls (in the PPL ACS) and no spin (very docile). CFI asks "So when will a plane spin?" the inevitable answer is "cross-controlled!" But *ONLY* if it is cross-controlled in a *SKID!* In a slip it is stable!
@greysheeum
@greysheeum 13 күн бұрын
Aviation education has gone downhill substantially over the past few decades.
@SAFEPilots
@SAFEPilots 6 күн бұрын
Yes, this discussion reveals that.
@bkailua1224
@bkailua1224 14 күн бұрын
I am sure this video is intended for student pilots and for this type of trainer this is valid. Gold seal CFI here, yes this is true with most all trainers and some other aircraft. But this is not true for all aircraft. The pilots I train and aircraft are more advanced and I show them how in a turn with slowly increasing angle of attack while slightly out of coordination and yawing they will find themself inverted and looking almost straight down at the ground and spinning when it stalls. These same aircraft if slipping will sometimes snap in the same direction of the high wing. These are fully aerobatic and we have chutes on.
@SAFEPilots
@SAFEPilots 6 күн бұрын
Understood (DPE here w/21K) in the "cross-controlled" configuration, make sure you are *slipping* and also power is at idle (increases rudder effectiveness and will spin "over the top")
@johnwillis688
@johnwillis688 15 күн бұрын
Don’t believe this!! I can demonstrate the error this at any time!
@jmax8692
@jmax8692 15 күн бұрын
Good advice although not entirely evaluated so be cautious any student pilots here. Another pro pilot tip when clearing the airspace at 4000 feet presumably MSL, the fucking boats on the river are irrelevant 😂😂
@SAFEPilots
@SAFEPilots 6 күн бұрын
Added the "boats on the lake" for a bit of humor!
@neriksen
@neriksen 16 күн бұрын
A Cherokee has a forgiving wing with its nice dihedral but a Cessna won’t be so forgiving. In any case, what you teach is so important and yet not taught enough. ✅👍🏻
@SAFEPilots
@SAFEPilots 6 күн бұрын
I have been itching for a day to take a C-152 up and film this demo (equally docile!) Critical point is understanding the difference between a slip and a skid! bit.ly/SAFE-CC
@jimmyfall9302
@jimmyfall9302 16 күн бұрын
Ads were longer than the video. Ridiculous.
@SAFEPilots
@SAFEPilots 6 күн бұрын
Agreed, we have been considering Vimeo but we also want to reach the wider audience of KZbin.
@petepeterson5337
@petepeterson5337 18 күн бұрын
It is possible to inadvertently enter a spin in a Cherokee. Happily in my experience when I was a student with an instructor in the plane, it is pretty easy to quickly break the stall/spin, but until then, it is surprising how quickly that docile plane can whip around.
@SAFEPilots
@SAFEPilots 6 күн бұрын
Agreed. Any plane can spin if you abuse it enough. Important here to demo high and also no one in the back. PA-28 famous for flat spin (CG aft).
@txkflier
@txkflier 19 күн бұрын
Boy, the haters are certainly out today.
@slade8212
@slade8212 8 күн бұрын
It’s not hating, this is just a dangerously incorrect explanation of angle of attack
@txkflier
@txkflier 8 күн бұрын
@ The position of the yoke isn’t an actual measurement of angle of attack, and I don’t think he said it was. However, the position of the yoke is relative to the angle of attack.
@slade8212
@slade8212 8 күн бұрын
@@txkflier the position of the yoke CAN be relative to the angle of attack. There are many situations in which angle of attack and yoke are separate. For example, after a stall has broken you can continue to hold the yoke back but the aoa will be decreasing as the nose drops. Obviously that’s not a situation in which this thinking is dangerous, but there could be. My issue with this (as an engineer and pilot) is that people are always wrong and always trying to oversimplify angle of attack. It’s not that difficult of a concept, and actually explaining to pilots what angle of attack is would be useful. Some things (like exact mechanism of lift generation which pilots get wrong all the time) are not important to understand to a full physical level. Angle of attack is something that all pilots should be able to correctly explain. “Life hack” explanations like this are not safe to teach students IMO, just give them a real explanation and examples of how it applies in flight.
@txkflier
@txkflier 8 күн бұрын
@@slade8212 If the plane is trimmed for a safe airspeed and you don't push or pull on the yoke excessively, the plane won't stall. Of course, you need to keep it right side up and not let it run into anything.
@slade8212
@slade8212 8 күн бұрын
@ sure, that’s typically true. There’s just a lot of important nuance to that discussion that is lost with simplifying it to “if you pull back all the way you stall”
@zz3709
@zz3709 19 күн бұрын
I thought the concern was with skidding in the base-to-final turn…? At 0:55 you're on a left bank with the ball to the left, so that's cross-controlled. Later, at 1:37 it's the same: left bank with ball to left, so how is this different?
@Tubes12AX7k
@Tubes12AX7k 20 күн бұрын
If you fly an early taildragger, it may not have flaps. The only consistent way to ensure a good controlled landing is to slip the plane. The alternative is to very carefully slow the plane down, raise the nose slowly, and then allow the plane to settle. So, slipping the plane is the best option, and it involves crossed controls.
@jimmydulin928
@jimmydulin928 20 күн бұрын
We certainly can control glide angle or glideslope with elevator pitch and airspeed with throttle so long as we maintain way too much airspeed to safely land a small airplane. Vso, an out of ground effect number, at the fence leads to many go around and LOC with damage and even fatalities. A pilot pulling on the stick is what causes stall. No more pitch up to go up... rather down. I taught at Monte Vista in the C-140 summers while my wife attended Adams State. I told my students that when pulling back doesn't get the climb they expect, try pushing on the yoke. Exceeding the critical angle of attack is when the stall happens. A pilot pulling on the stick is the cause. So if we use elevator for glide angle and rate of descent for a visual approach, we will have to use elevator at one inch above the runway to do the opposite, pull to stall/land/quit flying. All good so long as muscle memory is push not pull when we don't want to land/stall. So you big airplane jet guys are not going to either have problems climbing or need to three point stall land the airplane. We who want to be all slowed up and ready to squat, as Wolfgang says, so as to not damage skin and tin may find the power/pitch deceleration to bring dynamic throttle into very effective glide angle and rate of descent control all the way to touchdown on the numbers with power, may prefer elevator for airspeed control and power for glide angle control. And shooting many hand flown (the Huey had no autopilot) instrument approaches, required cyclic airspeed control and collective (think power) glideslope control.
@warren5699
@warren5699 12 күн бұрын
Have used pitch for glideslope and power for speed on approaches 100% of the time for 49 years. Never a problem. Go-arounds are the same as takeoffs - full power and pitch for airspeed. Sometimes if the go-around is started near or on the runway, acceleration is required before the climb can be started.
@jimmydulin928
@jimmydulin928 12 күн бұрын
@warren5699 Small airplanes can and should land slow enough that pitch up to the three point attitude, in very low ground effect, will cause descent rather than climb. While shooting the ILS your way, you change to pitch for airspeed to arrive at ground level in three point attitude all slowed up and ready to squat as Wolfgang says. KISS, a principle of war, works with training students to fly quickly. Elevator for airspeed and power for glide angle all the way down without changing keeps it simple.
@warren5699
@warren5699 12 күн бұрын
@@jimmydulin928 I don't really change the pitch for airspeed. I chop power, flare and hold the airplane barely above the surface. As you know, it transitions automatically to the landing attitude. It's all pitch to altitude, in this cases inches. Once the pitch and power are set and the airplane trimmed, most of the time it's just pitching to keep the aiming point stable (pitching to altitude). In the majority of the time, the pitch changes are so small that the speed is stable and no power changes are needed (usually speed changes plus or minus a couple of knots). So that often gets the workload down to just very very small adjustments in pitch (as far as pitch and power). I don't know how it could be simpler than that.
@jimmydulin928
@jimmydulin928 12 күн бұрын
@@warren5699 I am sure it works for you. The Navy does that, but they call it a catch. I assume your airplane is pretty heavy to stay planted going much faster than stall in one inch ground effect, which is way slower than Vso. Civilian airports don't have wires to catch. My 172 will skip and hop unless I arrive at ground level in a three point attitude all slowed up and ready to squat.
@warren5699
@warren5699 12 күн бұрын
@@jimmydulin928 It's really straight out of the handbook. The roundout starts 10-20ft above and by the time the mains get within inches of the runway, the rate of descent should be getting really close to zero. The line of flight becomes basically parallel to the runway surface for a few seconds with a gentle landing just above stall speed. The airspeed for a normal landing should result in a touchdown in not more than 400ft past a specified point. If you descended from 3000 to 2000 at 1.3xVso and chopped power when the leveloff began, it would look exactly the same as the roundout and landing.
@MadPropsAero
@MadPropsAero 20 күн бұрын
Really good info. Well expressed in understandable terms. Nice job.
@SAFEPilots
@SAFEPilots 6 күн бұрын
Thanks, glad to see someone understands this; critical to safety.
@rtbrtb_dutchy4183
@rtbrtb_dutchy4183 20 күн бұрын
This is a ridiculous explanation. This is why GA pilots have so many stall/spin accidents, because they get taught by guys like this.
@SAFEPilots
@SAFEPilots 6 күн бұрын
I think you are confusing angle of attack with airspeed. YOu can stall an airplane going straight down with a full back yoke. the "one G world of flight training" creates confusion.
@rtbrtb_dutchy4183
@rtbrtb_dutchy4183 6 күн бұрын
@ no, I’m not confusing AOA with airspeed. Full deflection of the elevator does not give any indication of angle of attack and doesn’t even mean you will stall the aircraft. Pulling back to a full deflection momentarily, doesn’t even mean the AOA will come close to its maximum. Also, you can exceed your critical angle of attack and not have a full deflection on the yoke. Prime example of that would be an accelerated stall. Your elevator/yoke position is not related to your angle of attack. I’m sure you have seen other people comment the same way as me. You should take some aerobatics lessons, maybe you understand it better then.
@robhoneycutt
@robhoneycutt 20 күн бұрын
This is really, REALLY bad information and should be completely ignored by ALL pilots. What this guy fails to understand is the fact that the critical angle of attack changes based on bank angle. You can have your yoke in a central position relative to level flight, and then if you bank the airplane to 60° you will exceed the critical angle of attack and stall the aircraft.
@warren5699
@warren5699 12 күн бұрын
Doesn't make sense. The steep turn is started with a centrally positioned yoke and then a steep bank which can be up to 60° if the pilot wants, and there's no stall.
@flyingconsultant
@flyingconsultant 12 күн бұрын
If you bank to 60° in a level flight, you will start descending unless you pull on the yoke.
@warren5699
@warren5699 12 күн бұрын
@@flyingconsultant Ok you didn't say you were maintaining level flight. It sounded like you were saying the bank alone will cause the stall. Even if you pull back and don't increase power, the airplane may not stall - only lose speed. You know it's one of those 'depends' scenarios.
@robhoneycutt
@robhoneycutt 12 күн бұрын
@@warren5699 Remember, stall speed increases with bank angle. Thus, you will stall earlier when you pull back on the yoke when in a bank. images.prepware.com/ASA-PPT-11/PPT-1-37.jpg
@flyingconsultant
@flyingconsultant 12 күн бұрын
@@warren5699 I think you’re mixed up your reply’s.
@BeyBoy17
@BeyBoy17 21 күн бұрын
A slip is not inherently dangerous on any plane. Try it with a skid.
@thomasperotti
@thomasperotti 23 күн бұрын
Carb heat and fuel pump anyone?
@michaelkhisa1692
@michaelkhisa1692 23 күн бұрын
Try the same maneuvers in a C172...
@manifestgtr
@manifestgtr 23 күн бұрын
What would this be like in a tommy or another similarly designed airplane? I feel like you’d *at least* get a wing drop. This seems like a consequence of design moreso than what any given model of airplane is likely to do. Don’t get me wrong…I fully believe the Cherokees behave like this. Whenever I’ve trained in them, they’ve been awesome. But I’ve also gotten wing drops in my RV12 while fully coordinated lol
@22airjordan1
@22airjordan1 24 күн бұрын
This is one reason I did not recommend flight training in the PA-28. They are very stable and docile and almost too easy to fly when learning. And can give students false sense of security because the aircraft is designed so well
@stephenabbott3623
@stephenabbott3623 24 күн бұрын
I could not agree more.
@warren5699
@warren5699 11 күн бұрын
Agree. Stall training should teach and safely demonstrate the worst things that can happen. Don't forget this model is not approved for spins for a reason.
@SierraBravo7970
@SierraBravo7970 6 күн бұрын
In my opinion That’s why you start in stable aircraft and progress to more complicated unstable aircraft. Starting out learning basic principles of an aircraft with positive dynamic and static stability which is built into most GA aircraft. A pilot can kill themselves just as fast in a PA-28. If not properly flown and I’d say that’s one of the worse things that can happen.
@LouiethePilot-2Learn
@LouiethePilot-2Learn 24 күн бұрын
For my full scale flying, I see the benefit of me flying 3D Large Scale Gas models. Especially when I’m flying in a stall with nose 45° up and using a lot of rudder, elevator, aileron combinations to stay at the edge of the stall without spinning while continuing to fly on a 45° pitch nose up. It’s called flying a harrier.
@scottpatterson4105
@scottpatterson4105 24 күн бұрын
I've found in 58 years of flying, defensive flying is just like defensive driving, there's no practical reason for induced incidents, accidents.
@latexhague8267
@latexhague8267 24 күн бұрын
I don’t believe that is the correct procedure for a cross controlled stall demonstration. You were slipping whereas a cross controlled stall is a skidding motion. To do a cross controlled stall correctly you first bank roughly 30 degrees in the direction of the overshot runway while simultaneously applying excessive rudder in the same direction. Over banking tendency will cause the pilot to apply aileron in the opposite direction while continuing to hold the same rudder inputs. Because you lose vertical lift from being in a steep turn the aircraft will descend more rapidly causing the pilot to then pitch up and eventually exceed the CAOA in an uncoordinated state and there is your stall spin scenario. Please correct if im wrong my intention is not to prove anyone wrong just have a discussion.
@xanderw1460
@xanderw1460 18 күн бұрын
This is also my understanding. Correcting for an overbanked attitude causes the low wing to stall first because it's at a higher aoa. That combined with the rudder input causes the spin.
@xlhits
@xlhits 14 күн бұрын
@@xanderw1460 this is how I understand it to be as well
@NorthwestAeronaut
@NorthwestAeronaut 2 күн бұрын
You're not incorrect and that is the traditional way to demonstrate the DANGERS of a cross-controlled stall as you can see in my video on Demo Stalls. However, cross controlling can be demonstrated in both the slipped condition as well as the skidding condition. What he's demonstrating here with he slipped condition goes a long way to show the stability of the aircraft and the slip, but the other side of that coin is the skidding condition that you are referring to and is as equally important of a demonstration.
@whoanelly737-8
@whoanelly737-8 24 күн бұрын
Absolutely outstanding!
@SAFEPilots
@SAFEPilots 6 күн бұрын
Thank you! Please share the content. SAFE is not-for-profit (all we "sell" is safety!)
@johnboleyn4024
@johnboleyn4024 24 күн бұрын
Stalls do not occur at the same angle of attack. Stalls occur when the critical angle of attack is exceeded. The critical angle of attack changes, relative to the angle of the wing to the oncoming air, and the load factor of the wing. The amount of aft travel left in the yoke, indicates nothing as far as when a stall will occur in any given flight attitude or configuration of the plane.
@warren5699
@warren5699 12 күн бұрын
Disagree. PHAK pg 5-25 - "The stalling speed of a particular aircraft is not a fixed value for all flight situations, but a given aircraft always stalls at the same AOA regardless of airspeed, weight, load factor, or density altitude."
@redfalco21
@redfalco21 10 күн бұрын
@@warren5699and yet it is possible to far exceed the so-called “Critical Angle of Attack” and get back into the “normal” AOA range without ever stalling. A wing only ever stalls when separation of airflow occurs. This happens when the inertia of air flowing past the wing exceeds the viscosity that makes the air follow the curvature over the wing and boundary layer. It is possible to unload a wing and then get slow enough that the inertia cannot overcome the air’s viscosity. The wing can be presented to the airflow at an angle exceeding the “Critical AOA” with air remaining attached, but producing less lift than necessary to sustain flight on its own. However, when combined with sufficient propeller thrust, certain aircraft may be able to fly like this, in an extreme nose high attitude. If you’ve ever watched a Sukhoi or Extra “hang on the propeller,” this what is happening.
@redfalco21
@redfalco21 10 күн бұрын
kzbin.info/www/bejne/iWi6oqqEnt6Dac0si=BMeH1R1v0ZKt09Js
@NorthCentralFlightCenter
@NorthCentralFlightCenter 9 күн бұрын
The critical angle of attack does not change. In most GA trainers, the critical AOA is around 18 degrees, and is a characteristic of the design of the aircraft. The PHAK is defined by the PHAK as "The angle of attack at which a wing stalls regardless of airspeed, flight attitude, or weight." The thing that DOES change is the angle of attack, which is the angle between the chord line of the airfoil and the relative wind it experiences.
@redfalco21
@redfalco21 8 күн бұрын
@@NorthCentralFlightCenter however, if you can get it to fly slow enough unloaded, you can then exceed the 17°-18° “critical AOA” and fly with a combination of wing lift and propeller thrust without ever stalling. Watch Martin Šonka as he holds formation with a parachutist in the link I shared. We do maneuvers in our Extra that frequently exceed 20°, 30° of AOA. If you fly slow enough, the air has insufficient momentum to separate. The problem is there is also insufficient lift to maintain level flight at or above 1g with wing lift alone. In the example above, Martin’s Extra is still flying, it is not stalled, and it is way above 17° or 18° AOA. A stall occurs when the inertia of the air exceeds the ability of the viscosity of the air to follow tight curvature and remain attached. There are other factors like adverse pressure gradient and reverse flow in the boundary layer that can trip a wing into stalling, but if a wing is moving very slowly, the viscosity and pressure are sufficient to keep it attached, because there is very little flow and very little momentum to the air. It won’t produce enough lift to fly with wing lift alone, but in combination with propeller thrust, the aircraft can be made to hold altitude, fly and respond to control inputs. We fly our aircraft to zero airspeed without stalling. When flying a double Immelmann, our exit speed at the top is 30 KIAS but we are not stalled (normally its straight and level 1g stall is achieved at around 60KIAS at a typical 17°-18° AOA). You have to have some speed in order to stall, or the air will not separate.
@sfopilot8
@sfopilot8 24 күн бұрын
Wow, this guy needs to read up on AOA's and their functions. There are infinitely better than the yoke position. Good luck, dude.
@greensagan
@greensagan 25 күн бұрын
I'm sorry for being annoying on the internet, but this was all pretty much garbage. Yes pitching up increases your pitch, and therefore increases angle of attack. But an AOA indicator is not how much chrome is showing. If you fly with an AOA indicator in turboprops, you will see how much other factors within the flight envelope, other than pitch, can change your angle of attack. The AOA vanes in transport category aircraft provide information to the flight computers and determine things like minimum airspeeds, pusher/shakers, trim etc. (In these jets you actually don't see the angle of attack indication like a traditional AOA indicator.) I get a strong sense you have never been in an airplane that has an AOA indicator. I do agree that GA aircraft don't need AOA indicators and healthy flying habits are more important than fancy instrumentation.
@cyppy7473
@cyppy7473 25 күн бұрын
Okay so I think that was the point of the video bud. He’s sitting in a 150… we are clearly not talking about jets.
@stephenwalton9646
@stephenwalton9646 24 күн бұрын
@@cyppy7473No, the topic is AOA and his theory is BS. There’s a correlation of sorts but only under specific circumstances.
@Jdr1053
@Jdr1053 23 күн бұрын
On a convential fixed horizontal stab/elevator combo and also on Stabiltors forming part of a reversible flight control system, at 1G in equilibrium flight, AOA is dependant on Elevator position and therefore Yoke position. If the yoke is moved out of this 1G/trimmed equilibrium it induces a change in AOA that is related to the CL of the elevator, Which translates to a pitch rate that depends on the airspeed. If that yoke is held fixed and the aircraft is allowed to settle into the new 1G equilibrium the aircraft will be flying at a new corresponding AOA. It is possible to pitch up at a Constant AOA, or even decreasing AOA. Think accelerating while keeping a constant positive pitch rate(recovery from the second half of a loop for example). however to keep a constant pitch rate you will have to vary the yoke position as the target AOA to achieve that pitch rate reduces with increasing speed. This is why when we trim any conventional airplane we don't fix a pitch angle we approximately fix an AOA which at 1G fixes our speed.
@stephenwalton9646
@stephenwalton9646 22 күн бұрын
@ Pitch rate varies with speed during a symmetrical loop, AOA is variable during the maneuver. The video fails to mention one G flight and most folks get into trouble outside that parameter. Finally, if such a simplistic explanation was valid, it would have been taught as such for the last 100 years. Teaching stick/yoke position equates to AOA is misleading and possibly confusing to some folks who don’t need any more confusion as they learn to fly.
@rtbrtb_dutchy4183
@rtbrtb_dutchy4183 20 күн бұрын
@@cyppy7473doesn’t matter if he is sitting in a 150. It’s still complete BS.
@MemphisBBQ640
@MemphisBBQ640 25 күн бұрын
Simply put, the closer the stick/yoke is to your gut, the greater is your angle of atack and the closer you are to the stall.
@flyingconsultant
@flyingconsultant 12 күн бұрын
Unless it’s a trim induced stall.
@warren5699
@warren5699 12 күн бұрын
@@flyingconsultant Like in a go-around? The propeller slipstream combined with the trim tab position makes the elevator and thus the angle of attack go up excessively. The yoke will move back the same as if the pilot pulled it back.
@chucklemasters6433
@chucklemasters6433 2 күн бұрын
if you eat enough bbq the stick won't come back far enough to stall! so the more you eat the safer pilot you are
@DNModels
@DNModels 25 күн бұрын
Bull$hi7
@Dyson_Cyberdynesystems
@Dyson_Cyberdynesystems 25 күн бұрын
I thought the reason to get them is to know when you are ONSPEED and the help with energy management..
@9sixteenMotorsports
@9sixteenMotorsports 25 күн бұрын
Now do it with left aileron and left rudder together and see what happens. 🤣
@whoanelly737-8
@whoanelly737-8 25 күн бұрын
1G stall speed is what is marked.