I just saw the Jetlev Flyer (aka water jetpack) on the Discovery Channel. This thing looks like a lot of fun! It works just like you think it should, pushing the pilot airborne with huge jets of water.
Each stream of water has a lifting force of 400-500 pounds, which is enough to lift this dude sky high. The only problem: you need to stay attached to a rubber hose that supplies the water to the pack. You can fly anywhere as long as you keep your pump raft in tow.
The promotional video (below) has everything: fast music, dynamic camera movements, and a chick in a bikini who doesn’t actually ride the jetpack in the video.
The Jetlev Flyer can be yours for the low low MSRP of 129,000 euro ($179,000).