I'd say it's just the transition area between high pressure driven lift on the lower surface (high angle of attack, stall) and the low pressure lift on the upper surface (low angle of attack, no stall). First one decreasing, second one starting (flow attaching). I'm not a paragliding expert but from an aerodynamic point of view that sounds logical to me.
very informative in layman's terms. thanks for sharing, Andre! Wish I could afford to go to your clinic. it would be fun and a great learning experience.
that natural behavior is the difficulty for beginners to assess the wind just right and adjust therefore how much you do your initial pull, to hard and it will overshoot or lift you, too less and it fall back down
I already talked about this point with my student today. But I don't think that it is a constant point even in the same wind and wing. If the wing is already going down, that point will be higher, and vice versa. (because wing still has momentum either way, it tries to continue its movement) Actually this is the point where your glider stalls and angle of attack should be decreased to move it higher. It is very important to realize that point even before the glider stalls or flies back. Understanding this point helps a lot when training fly back and exiting the stall.
It's the point at which the flow is detaching, right? It's different in different wings and wing speeds for a lot of reasons, but you can see early on with the Ion that the trailing edge is still flopping back from the C's. This probably has the biggest effect. Being smaller this would affect the Seed less.... that my theory anyway.
Is this not similar to the stall point? Given your example method to find the "sticking point" of starting with the wing overhead and applying control input until the wing drops back naturally. Also Berkhan's point about momentum is important, so many wing behaviors are dynamic and not steady state. Perhaps a retest is worth while with different initial conditions (high speed/low speed of wing travel) to add another dimension to the experiment.
I think it is similar in some ways and not in others. The stall in flight as I understand it as long as you're smooth and progressive with your brake input the wing will largely stay above you as you continue to pull the entirety of the brake range, on the ground not so much, there is a point past which there is little gain in continuing to pull the brakes. Also if you're "past" the stall point in flight the wing will bite forward fast with a lot of energy, and not so on the ground. About momentum and initial speed, yes very true, but I wanted the video to be simple enough that it would help beginners out with some basic notions. If you're thinking about that sort of stuff you're further ahead than the video on your groundhandling skills, which is great :)
You mean why it's important to know where it is? Yes so that you have better understanding of why the wing reacts in certain ways so that you can anticipate what it's going to do and have better control in many situations
@@LeeThomas-1 ahah, oh yes the old fame! Nope, very few people live and fly here, and very few of those have Gins, let alone the right model and size. You can't issue a challenge and then not provide the tools! :-P
I'd say it's just the transition area between high pressure driven lift on the lower surface (high angle of attack, stall) and the low pressure lift on the upper surface (low angle of attack, no stall). First one decreasing, second one starting (flow attaching). I'm not a paragliding expert but from an aerodynamic point of view that sounds logical to me.
Thanks André
very informative in layman's terms. thanks for sharing, Andre! Wish I could afford to go to your clinic. it would be fun and a great learning experience.
Cheers Josh, appreciate it!
that natural behavior is the difficulty for beginners to assess the wind just right and adjust therefore how much you do your initial pull, to hard and it will overshoot or lift you, too less and it fall back down
I already talked about this point with my student today. But I don't think that it is a constant point even in the same wind and wing. If the wing is already going down, that point will be higher, and vice versa. (because wing still has momentum either way, it tries to continue its movement) Actually this is the point where your glider stalls and angle of attack should be decreased to move it higher. It is very important to realize that point even before the glider stalls or flies back. Understanding this point helps a lot when training fly back and exiting the stall.
yep, the wing has mass and inertia, so yes you can release below the sticking point and still make it through if the wing is going fast enough :)
Great explanation!!!
It's the point at which the flow is detaching, right? It's different in different wings and wing speeds for a lot of reasons, but you can see early on with the Ion that the trailing edge is still flopping back from the C's. This probably has the biggest effect. Being smaller this would affect the Seed less.... that my theory anyway.
As far as I learned from pilot classes, critical angle of attack does not depend on speed, nor weight. It only depends on the wing shape.
Is this not similar to the stall point? Given your example method to find the "sticking point" of starting with the wing overhead and applying control input until the wing drops back naturally.
Also Berkhan's point about momentum is important, so many wing behaviors are dynamic and not steady state. Perhaps a retest is worth while with different initial conditions (high speed/low speed of wing travel) to add another dimension to the experiment.
I think it is similar in some ways and not in others. The stall in flight as I understand it as long as you're smooth and progressive with your brake input the wing will largely stay above you as you continue to pull the entirety of the brake range, on the ground not so much, there is a point past which there is little gain in continuing to pull the brakes. Also if you're "past" the stall point in flight the wing will bite forward fast with a lot of energy, and not so on the ground.
About momentum and initial speed, yes very true, but I wanted the video to be simple enough that it would help beginners out with some basic notions. If you're thinking about that sort of stuff you're further ahead than the video on your groundhandling skills, which is great :)
What is the exact sense behind it? Not to crash the wing down or just to learn more about the wings behavior? Thx for any feedback...
You mean why it's important to know where it is? Yes so that you have better understanding of why the wing reacts in certain ways so that you can anticipate what it's going to do and have better control in many situations
@@AndreBandarra1 Thanks for your quick reply... good job! Appreciate your efforts and your channel!!!
No problem, have fun! :) thanks for the support!
Do the"Sticking Point" change with the age of the wing?
Yes
Are you from Portugal Andre?
yup!
@@AndreBandarra1 I like your accent, really nice one. Great videos too man, keep it up :)
Here's a challenge for you Andre. Ground handle a Gin Sprint 3 in quite strong winds. Say 18 - 19 mph.
Can you supply the wing? :)
You're not getting sand in my wing lol.. With your fame i'm sure someone in your area with one would let you have a go :-)
@@LeeThomas-1 Come on send him your wing, then send it to me please! LOL
@@MrCoolcool666 The question is if i send you my wing could you handle it 😂😂😋
@@LeeThomas-1 ahah, oh yes the old fame! Nope, very few people live and fly here, and very few of those have Gins, let alone the right model and size. You can't issue a challenge and then not provide the tools! :-P