federal regulations limit the use of such devices, and it「s unclear whether people will shell out $100,000 for a jet pack whose capabilities have been demonstrated on paper but not in the air.
the jet pack was actually developed by 1961, wilson says.
wilson说,在1961年,个人飞行器被实际进行研制。
he says the jet pack first appeared in 1928 in an amazing stories comic book, which featured the hero buck rogers zooming though the sky in a jet pack.
the jet pack is a perfect example of predicting the future, wilson says.
wilson说,喷气式飞行背包是预测未来的再好不过的例子。
nor could a jet pack be of use to ordinary people who wanted to avoid rush-hour traffic, wilson says.
希望避免上班高峰期交通的平民来说,wilson说,个人飞行器也无法派上用途。
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.
the martin jet pack is designed to conform to the federal aviation administration's definition of an ultralight vehicle, which weighs less than 254 pounds and carries only one passenger.