This would be done on water like regular surfing but aimed away from land for obvious reasons.
Once the rocket underneith the board is ignited, you'd ski on the water for a few seconds before taking off, (the board would be aerodynamically designed for flight more than surfing,) and you'd see how long you could control the thing before getting knocked off by the wind hitting you at 60, 120, 180 MPH etc, crouching, maneuvering, praying.
The competition aspect of this would be top speed and distance. Winners get a trophy and free medical care for life which they're probably need after hitting the ocean at 350 mph.
Totally different because mine's named Jeff.-- doctorremulac3, Dec 29 2023 Proof of concept. https://www.youtube...watch?v=0OzXZGA1k3sFollow the science. [doctorremulac3, Dec 29 2023] link https://www.merriam...com/dictionary/josh(again) [doctorremulac3, Dec 29 2023] I'm guessing that's not an initialism, that's the sound you make when you see I've posted an idea.-- doctorremulac3, Dec 29 2023 Congratulations, everybody needs a purpose in life to give it meaning eh?
//Nope, it's from the help file//
See link. (again)-- doctorremulac3, Dec 29 2023 random, halfbakery