https://www.youtube.com/watch?v=_Fq33dHNSfI

After a couple of minutes of flight, he provides an explanation of his approach. I don't expect that anyone would mount a boom on their glider, but I'm thinking a camera on a wing tip or the top of the empennage would yield some raw footage that would be worthwhile to edit.


Here's a similar application on a glider with a 3:1 performance:

https://youtu.be/xYV_ZU4HSEA