Thank for posting!
I must say I have a feeling this may not be the ultimate surfing mod, and some of the people may be disappointed with this surfing mod...
Now that I've seen several video clips, to me the pocket does not look like something that can push a beginner/or weak surfer (ropeless)
ANother thing that I noticed is this.
There is a very distinct line of spray water coming off of the Booster, on the outside of the device. It may not look like much, but it ruins the surface of the pocket making it a little harder to find a "sweet spot".
View attachment 82177
I also think this could be THE reason this has been tested without ballast... I think that pushing the stern lower/deeper will (likely) make it worse.
This may not be a big detriment for a strong surfer, but someone who is just starting can benefit from a large, smooth sweet spot more than anything else.
I had seen that exact same thing (only way, way worse) when I was testing my little plywood Booster/Scooper/Surf Stream gizmos. Granted in my case it was really bad but the trend was unmistakable - this off-side spray was bigger with ballast and smaller without.
https://jetboaters.net/threads/surfstream-diy-edition-prototyping-in-ar240.16075/#post-276180
EDIT: this post is not meant to be a ding on the whole concept of Yamaha Wake Booster!!!
I think it may work very well for some, but I don;t see this as a
breakthrough in surfing behind a Yamaha
Now, those new steering nozzles - that's a different story - WINNER!!! (I think)
--