linkDesigner Ramke's invention can power the rider to a height of 50 feet (15m), has a top speed of 30mph, and can travel almost 200 miles before it needs to be refuelled.
A floating pump powered by a 150 horsepower four-stroke engine sends water through a 140ft-long (43m) hose to a pair of nozzles mounted on the jet pack.
The jet leaving the nozzles is sufficiently powerful to push the rider off the ground.
The nozzles can then be angled to propel the pilot forward in "stable, controlled flight".
The website advertising the jetpack, which retails at around £160,000, claims the device offers "freedom, exhilaration, [and] adventure". ...