Getting stuck/parked - near miss strong crosswind soaring - 3D modelling

[@wmedlinmd]

Love the breakdown of the vectors - my brain will bring this up quickly when needed! Thanks Rudolf for being a sport!!!

[@Flightcoach]

Thanks Walter!!

[@karolmargas8596]

Bas, this 3D simulation is AWESOME!!!! I love to watch this. I am already starting adventure with PG but this is something which should see people even before they will start lift into air. It gives so much important info how it works!. Brilliant job man. Take care!

[@Flightcoach]

Hey Karol! that is AWESOME TO HEAR MATE! :D thanks a lot, these are the kinds of comments that make me smile and think "yep thats why i invest in this channel"!

[@warrybk]

Wow, what an honor to be reviewed in such way. Great tips, some bit painful to hear 😉! But thanks a lot for the feedback, can’t wait for the next vid!! Awesome channel Bas!

[@Flightcoach]

You are welcome my man! :)

[@harmdevries6874]

Mooi in beeld gebracht Bas !!🙂👍🏻 Leerzaam! 👊🏻😉

[@Flightcoach]

Hey harm thanks man!

[@Der_._Samu]

Thank you so much for sharing this valuable content! Love it! Always Happy Landings 🤙🏽 Samu from Germany

[@Flightcoach]

Glad you enjoyed it!!

[@PetervanderSchee]

Heel mooi Bas...duidelijk met die gevirtualiseerde beelden!

[@Flightcoach]

Hey Peter dankjewel!! And welcome to the channel!

[@osmera_pg]

I was hoping for explanation for this oscillation... Is it so, that he first induced this oscillation by pilot error and further it was magnified by the wind from side, so the wind catched the ear of the canopy, exaggerated the pendulum, turned his direction a little bit and he on the apposite side of the pendulum tried to rectify the direction and in reality he helped the pendulum effect and back to the wind catching his ear. Is it the right explanation?

[@Flightcoach]

Hi Stanislav, welcome to the channel! For as far as i saw, the original cause was the pilot taking off while banking the glider, as can be seen at 2:42. He swings underneath and then to the other side of the wing. This should have been corrected by using counter weightshift and a bit of brake, but as you can see at 2:44 he is weightshifting to the left, which is too late. at this point in time a weightshift to the right would have been better. He is constantly around 1 second late with his weightshift, making the problem worse or at least keeping the swing in. This is quite a dynamic wing, so it responds well to weightshift... meaning if you time it wrong, or use the wrong amount, you make problems for yourself. The wind in itself was a bit challenging that day, being cross and a bit gusty, but that or the shape of the dune had nothing to do with it, is my conclusion. You have an interesting point, discussing the side surface, the ear, and that catching wind, but that surface is way smaller and less loaded than the more horizontal surface, the forces acting on the side are almost nill compared to the other forces. I dont think that the wind "hitting" that side has any influence, also because the main wind direction of a glider in normal flight is always head on, the component that "hits" from the side even when gusty, is really small compared to the vector on the nose. Hope that anwsers your question?

[@elektrotechniekbijhetdavin6849]

I was wonderingbthe same thing, thanks for the answer,.

[@peterelliott2914]

I have a mate with one of those wings and he got rid of it because it was prone to exactly the same thing. It oscillates so bad...

[@Flightcoach]

it is a very dynamic wing indeed ;)

[@resqueman]

As a beginner pilot, this has happened to me more than once. I tend to fly up and backwards. There is no time for speedbar or trimmers. Going downwind helpt if there are no dunes or posts.

[@Flightcoach]

glad you recognize it :) and yeah indeed, it really helps if you have room in this case to your left... if there is an obstacle there, you have to start flying away from the dune earlier :-D

[@Seneslau07]

Just the other day I've got a small lateral oscillation from a thermic bubble and thought, ok I know how to stop a pitch oscillation with the brakes but what about a lateral one on the roll axis? Is doing nothing the answer instead of being late with the weight shift and amplify it? I can't imagine the correct weight shift timing if I were to go that path...When your body is at full bank to the right and the wing dropped to the left in that moment you weight shift to the right and keep it there as the body descends and the wing goes up? Or if you just stay at neutral the roll will dissipate? I'm a beginner so thank you!

[@Flightcoach]

Great question, welcome to the channel. If you fly a glider that is suitable for your level, it should dampen out by itself, you can aid this process by applying a bit more brake (so on both sides). If you have enough terrain clearance you can practice correcting with weightshift, the timing is hard to put into words but the easiest explanation is do the opposite of what makes the oscillation increase 😉 ask your instructor to help out with that and find your timing. Of course you can also arrest the oscillation with brake line steering, but take it slow, no big movements, the timing is more important than the amplitude.

[@stealthwingsrc1094]

Excellent info. But I thought you were using a helmetcam. This way you still could continue filming and focus on you buddy. We would love to see what happend after you turned off the camera.

[@Flightcoach]

Haha nope, was with my Phone, else for sure I'd left it on :) and thanks!

[@paraglidingflyer]

Did he have the ability to control the wing to turn downslope?

[@Flightcoach]

Hi Scott! Yeah sure, he was just really focussed on flying into wind while flying perpendicular to the dune was the better option here

[@MikeCotter1]

So lots to unpack here but I'm going to just point out a few. So what we're looking at pilot induced oscillations. PIO. you mentioned in the video that he was preoccupied with weight shift and opening up his trimmers right at launch, you should never have to do that nor should he based on the excessive oscillations as well as pitch Dynamics. Is that wind comes off the shore and up and over the dunes it accelerates and if there are small valleys and varying heights between the dunes you get a Venturi effect creating a 3rd wind speed. Right off the bat you could see these conditions were way above his skill level quite frankly his launch technique could get anybody in trouble in favorable conditions. For a new pilot they will usually put in the exact opposite input to correct an oscillation then what's needed. Fortunately everything worked out I think and he experienced a Learning lesson

[@Flightcoach]

Hey Mike welcome to the channel and thanks for chipping in, i remember you from the great pic you took and posted somewhere on FB, i see you have it as profile pic now! PIO... PIT yep same thing different name ;-) i find PIT more funny because my fort pierce based flying instructor used that term when we were bouncy on the yoke/rudder it always stuck with me. I think Rudolfs main error was trying to find a solution to his perceived problem (im not going fast enough to escape this dune) but choosing the wrong one (lets speed up the glider on this into wind heading) instead of the right one (lets change course first, so i have room to fiddle with my stuff). Yep that was some nasty oscilation allright, he has a tendency to hold onto the risers way too much, that only increases the problem here. Is that a thing you see in your ppg students as well or is that a pg problem?