Fabio had the idea to film the air flow around the viking ship from inside the wind tunnel, with his GoPro Hero4. Thanks you for lending it to me, Fabio! I was able to play a little bit with it and followed his idea. I really like the GoPro Hero4.
As “tripod” I used an old giveaway that comes from a time gone by, a “FUJI film” beanbag.
In the video you can see the wake turbulences above and below the sail from a new perspective. I like it. I think there will be more videos using this view.