We first caught sight of this bit of technology in patent form way back in 2007 but, in a bit of a twist, it’s now actually come to fruition, and could well soon be hurling you across a lake near you. As you can imagine, the jetpack works as described in the patent, with it employing a flexible hose / tether that gets paired with a separate vessel that houses the propulsion engine and other related systems. That apparently greatly improves the thrust to weight ratio compared to a standalone jetpack, and makes the system a good deal safer as a bonus.

See the rest here:
Water-powered Jetlev makes jetpacks fun for non-daredevils