Backpack helicopter | Wikipedia audio article
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Backpack helicopter | Wikipedia audio article

August 10, 2019

A backpack helicopter is a helicopter motor
and rotor and controls assembly that can be strapped to a person’s back, so he can walk
about on the ground wearing it, and can use it to fly. It uses a harness like a parachute harness
and should have a strap between the legs (so the pilot does not fall out of the harness
during flight). Some designs may use a ducted fan design to
increase upward thrust. Several inventors have tried to make backpack
helicopters, with mixed results. Typically, a backpack helicopter differs from
a conventional helicopter in two main ways: First, there is no tail rotor, and the main
rotors are contra-rotating. Yaw is controlled by fine adjustment of a
differential gear in the rotor drive transmission. When one rotor is adjusted to spin slightly
faster than the other, it induces yaw (turning motion). Second, the rotors are fixed pitch, which
assists with simplicity; this means, however, that in the event of engine failure autorotation
is impossible. Usually, a ballistic parachute would be incorporated
for safety. An edition of Popular Science magazine in
1969 featured a backpack helicopter that used small jet engines in a tip jet configuration
instead of contra-rotating rotors. This design could function in autorotation. Related are devices like a backpack helicopter
which also include a seat and leg supports, which are small, open-topped helicopters. In theory, a helicopter would be more efficient
than a rocket-powered jetpack, possessing a greater specific impulse, and being more
suited to hovering, due to the lower velocities of the propelled gases.==Examples=====Pure backpacks===
The Heliofly was a make which was designed in Germany in 1941 onwards. The Pentecost HX-1 Hoppi-Copter was developed
by Horace T. Pentecost, an independent inventor and demonstrated to the military in 1945. Rhyme (made in Japan)
The Libelula (“dragonfly”) from Tecnologia Aeroespacial Mexicana has a 2-bladed rotor
driven by a small rocket motor at the end of each rotor blade. The company also manufactures a jetpack.===With a seat===
SoloTrek XFV (Exo-skeletal Flying Vehicle). Martin Jetpack
Vortech designed various models which have seats. They formerly also made a pure backpack model
with two very long rotor blades driven by a little propane-powered jet motor at the
end of each blade. GenH4
The Aerospace Corporation’s Springtail==See also==
Baumgärtl Heliofly III Jet pack
Hovercar Ultralight aircraft
Gyrodyne RON Rotorcycle Hiller ROE-1 / YROE-1 “Rotorcycle”==Distinguish from==
In recent years “Heli Backpack” has become a tradename for a make of ordinary walkers’

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