I thought is jet flyboard dophin manuvers, whoops.It just becomes popular to play the jet flyboard, but mostly they use the jet ski as the powersource. I see mostly they use Yamaha VXR above and Yamaha FZR really do a great job--see the video on jet flyboard powered by yamaha FZR from watersports-Jiujiang Flit Boating CO.,Ltd.
But It seems that will hurt the jet ski if powered the flyboard.