A backpack helicopter is a helicopter motor and rotor and controls assembly that can be strapped to a person's back, so that he can walk about on the ground wearing it, and can use it to fly. Its harness, like a parachute harness, should have a strap between the legs, so that the pilot does not fall out of the harness during flight.
Some designs may use ducted fan design to increase upward thrust.
Related are devices like a backpack helicopter which also include a seat and leg supports and are actually very small open-topped ordinary helicopters.
Several inventors have tried to make backpack helicopters, with mixed results.
In theory, a helicopter would be more efficient than a rocket/jet pack, possessing a greater specific impulse, and being more suited to hovering due to the smaller velocities of the propelled gases.
Backpack helicopters occur sometimes in fiction. All real backpack helicopters are flown with its pilot's body vertical, but there are some in fiction (for example, inDan Dare comics and the video game H.E.R.O.) which are flown with its pilot's body horizontal.
Inspector Gadget used the "Gadget 'Copter" which opened a helicopter from his hat.
Backpack helicopters are considered to be relatively popular gadget. The Martin Jetpack (which is not a jetpack, despite its name) has appeared in spy films such as the 2003 film Agent Cody Banks.
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