Theoreticaly speaking, a lightweight sabre rocket engine (breathing engine) should be able to power a jetpack with far less fuel. 3d metal printers (such as ma

Theoreticaly speaking, a lightweight sabre rocket engine (breathing engine) should be able to power a jetpack with far less fuel. 3d metal printers (such as makerforge) let home engineers design/build all kinds of bizarre stuff that wasn't possible till it was one day.