One of my fav shows, they made a jet pack from plans on the web to see if it would work. Adam and Jamie embark on the longest and most ambitious build they’ve ever undertaken: creating their own personal flying machine from scratch. Are these machines as magnificent as their designers claim? To make the project more realistic, the two limit themselves to a build period of one month and a budget of $10,000. They busted the myth pretty well. Link.
MythBusters make a DIY Jet Pack