I have developed a functional water jetpack that can fly. There is one company in the world that also makes a water jetpack and it retails for $100,000.00 dollars. My design and construction has a material cost of $1,200.00 dollars, and can be reduced with higher volume parts orders. There is also an opportunity of creating rental franchises. The current rental rate is $200.00 per hour. http://californiajetpack.com/