Okay so Im going to look an idiot, here, because Im going to ask you something that for some reason I've either gone comletely blank or having a blank moment,


here we go

A stall is a flight condition that occures when he angle of attack become so high that the air flowing over the top of he wing's camber can no longer flow smoothly and it breaks away. This disturbs the low pressure (above the wing) and causes the wing to loose lift,

So im like here thinking this: Why does the air that can no longer flow smoothly over the top of the wing affect lift when the high pressure under neath the wing is what causes lift not the airflow above

And also a wing doesn't stall because of low airspeed or high gross weight, but it salls when a specific anle of attack is reached.

okay fair enough, but let me ask this then, if your flying straight and level and you pitch up 5-8 degree's
(critical angle of attack is 18-20 on most wings) and you slowly start to slow down until the point where you reach 44 knots in a 172, you've not exceeded that critical angle of attach you've just slowed down so much you can't sustain level flight, is this considered a stall or not,

so open for getting critised but hey, I'll ask questions until I get it right and thank everyone who helps

Wonder if there will be a point when the roles will be reversed!

That's the main misconception. The low pressure on the top of the wing accounts as much if not more to the total generated lift than the high pressure on the bottom.



Picture it another way. You're flying 80kt and level. you reduce power gradually, which makes you slow down, but you also gradually pull up to maintain level flight (zero vertical speed). The slower you fly the more you'll have to pitch up if you want to keep flying level. Ultimately, when you reach the stall speed still in level flight, the angle of attack of the wing WILL eventually reach the critical AoA and that's what will make you stall.

Remember the AoA is the angle between the wing chord and the trajectory , not the horizon.
Using level flight just makes it easier to understand as in that particular case the trajectory is flat like the horizon.

In your scenario, if I understood it well, you fly straight and level, then pitch up and maintain your pitch angle. The speed will decrease, and your engine's power won't allow you to keep your climb rate. So you'll eventually start climbing less, and ultimately descending, still with the same pitch angle. This time it's the varying trajectory that will increase AoA until the critical one.

In my situation the trajectory was fixed (always mainiaining level flight), but the pitch angle (and related angle between the wing's chord and the ground) varying. In yours the pitch angle and related wing angle are fixed, but the trajectory varies. The result is just the same.

You guys are amazing, I was infact having a thick moment!!

But you helped me understand it even better so thank you so much!

I like the way you used an power off stall to shows example of maintaining altitude while increasing pitch to compensate for slowing speed, which eventually reaches that CAoA.

Off to go see a 100hr Inspect done (this will be good) find out all about the insides of the engine!

Enjoy your weekend, Thank you