Martin states that he has spent 27 years designing and perfecting his jetpack. It stands about five feet tall and its rotors are encased in two large ducts; a three-legged tripod holds it at rest when on the ground. A 200 horsepower gasoline engine provides power to the rotors.
“If someone says, ‘I’m not going to buy a jetpack until it’s the size of my high school backpack and has a turbine engine in it,’ that’s fine,” Martin said. “ But they’re not going to be flying a jetpack in their lifetime.”
Okay, well, I guess I'm still waiting for my Gen-u-ine Heinlein jump harness, like the one in Stranger in a Strange Land (1961).
Boone ordered "Fly up to the Sanctum office and tell the Warden on duty that I want another pilgrim's badge at the Sanctuary gate right away. The word is 'Mars.'"
"'Mars,'" the kid repeated, threw Boone a Scout salute and made a sixty-foot leap over the crowd. Jill realized why the robe looked bulky; it concealed a jump harness.
(Read more about Heinlein's jump harness)
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Humanoid Robots Building Humanoid Robots
''Pardon me, Struthers,' he broke in suddenly... 'haven't you a section of the factory where only robot labor is employed?''
Stratospheric Solar Geoengineering From Harvard
'Pina2bo would have to operate full blast for many years to put as much SO2 into the stratosphere as its namesake had done in a few minutes.'