Can be done on your own or with help of a friend.
Cells exposed at the edge of the window inflate and pull the wing up like a snake.
Finesse on the brakes here is key.
Success: up 3x in a row
Wing: Advance | Sigma XAlps | 25m2
Wind: 20km/h | mild turbulence | strong lift
Great demonstration of how to cobra launch on your own.
Wing: Gradient | Golden 4 | 24m2
Wind: 20km/h | no turbulence | mild lift
Cobra launch without sliding the wing along the takeoff. Good for small takeoff areas and strong wind.
Wing: Mac Para | Eden 6 | 28m2
Wind: 20km/h | mild turbulence | mild lift
Secret is to have wing perpendicular to slope/wind and stand at 45 degrees to wing. Inflate by pulling the outer A line across your body so there is never any slack.