From CNN:
"Hollywood has envisioned jet packs as upside-down fire extinguishers strapped to people's backs. But Glenn Martin's invention is far more unwieldy -- a 250-pound piano-sized contraption that people settle into rather than strap on. As thousands looked on Tuesday, the inventor's 16-year-old son donned a helmet, fastened himself to a prototype Martin jet pack and revved the engine, which sounded like a motorcycle. Harrison Martin eased about three feet off the ground, the engine roaring with a whine so loud that some kids covered their ears."
http://www.cnn.com/2008/TECH/ptech/07/30/jetpack.unveiled.ap/index.html
"Hollywood has envisioned jet packs as upside-down fire extinguishers strapped to people's backs. But Glenn Martin's invention is far more unwieldy -- a 250-pound piano-sized contraption that people settle into rather than strap on. As thousands looked on Tuesday, the inventor's 16-year-old son donned a helmet, fastened himself to a prototype Martin jet pack and revved the engine, which sounded like a motorcycle. Harrison Martin eased about three feet off the ground, the engine roaring with a whine so loud that some kids covered their ears."
http://www.cnn.com/2008/TECH/ptech/07/30/jetpack.unveiled.ap/index.html