Hoppi-Copter
Pentecost HX-1 Hoppi-Copter on display at Pima Air & Space Museum, in Arizona, U.S.
Role Backpack helicopter
National origin United States
Manufacturer Hoppi-Copters Inc.
First flight c. 1940

The Hoppi-Copter was a functional backpack helicopter developed by the American company Hoppi-Copters Inc. founded by Horace T. Pentecost in the 1940s.[1] The original Hoppi-Copter consisted of two contra-rotating rotors on a pole attached to a motorized backpack.[2] Although it was capable of flight, it was extremely hard to control.[3]

Later prototypes of the Hoppi-Copter included versions with the pilot in a sitting position, and were in effect miniature one-man helicopters of a more conventional design, though retaining the contra-rotating rotors and thus obviating a tail rotor.[1][4] Despite interest from the British Ministry of Supply in the 102 and 104 models,[5] none were adopted commercially.[3]

Variants

Pentecost HX-1 Hoppi-Copter (Hoppi-Copter 100)
original back-pack version.
Hoppi-Copter 101
equipped with a seat and landing gear, proved that more development was necessary.[6]
Hoppi-Copter 102
framed, with seat for pilot.[4]
Hoppi-Copter 103
as the 102, but lighter with a more powerful engine and slightly greater rotor diameter
Hoppi-Copter 104
as the 103, with even greater rotor diameter[5]
Hoppi-Copter Firefly

Specifications (Hoppi-Copter 102)

Data from Jane's All the World's Aircraft 1948[4]

General characteristics

Performance

See also

References

  1. ^ a b "The Hoppi-Copter" (PDF). Flight. October 14, 1948. Retrieved January 7, 2016.
  2. ^ Pentecost, Horace T. (17 Oct 1945), US2461347 A, Helicopter adapted to be attached to a pilot, retrieved 2016-01-07
  3. ^ a b "Pentecost HX-1 (Model 100) Hoppi-Copter". Smithsonian National Air and Space Museum. Retrieved 2016-01-07.
  4. ^ a b c Bridgman, Leonard (1948). Jane's All the World's Aircraft 1948. London: Sampson, Low, Marston and Co. Ltd. p. 271c.
  5. ^ a b Bridgman, Leonard (1949). Jane's All the World's Aircraft 1949. London: Samson, Low, Marston and Co. Ltd. p. 234c.
  6. ^ Bridgman, Leonard (1951). Jane's All the World's Aircraft 1951. London: Samson, Low, Marston and Co. Ltd. p. 248c.
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