Engineering:Hoppi-Copter
| 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
- Crew: One
- Empty weight: 173 lb (78 kg)
- Gross weight: 363 lb (165 kg)
- Powerplant: 1 × Unknown 750 cm3 (46 cu in) two stroke flat twin, 35 hp (26 kW) at 4,500 rpm; 9.1:1 reduction gearing to rotors
- Main rotor diameter: 2× 16 ft (4.9 m)
- Main rotor area: 402 sq ft (37.3 m2) total
Performance
- Maximum speed: 96 mph (154 km/h, 83 kn) all performance figures estimated
- Endurance: 1 hr at cruising speed
- Service ceiling: 12,000 ft (3,700 m) hover
- Disk loading: 1.8 lb/sq ft (8.8 kg/m2)
See also
- Hiller YROE
- Gyrodyne RON Rotorcycle
References
- ↑ 1.0 1.1 "The Hoppi-Copter". Flight. October 14, 1948. https://www.flightglobal.com/FlightPDFArchive/1948/1948%20-%201726.PDF.
- ↑ Pentecost, Horace T. (17 Oct 1945), US2461347 A, Helicopter adapted to be attached to a pilot, https://www.google.com/patents/US2461347, retrieved 2016-01-07
- ↑ 3.0 3.1 "Pentecost HX-1 (Model 100) Hoppi-Copter". http://airandspace.si.edu/collections/artifact.cfm?object=nasm_A19520054000.
- ↑ 4.0 4.1 4.2 Bridgman, Leonard (1948). Jane's All the World's Aircraft 1948. London: Sampson, Low, Marston and Co. Ltd. p. 271c.
- ↑ 5.0 5.1 Bridgman, Leonard (1949). Jane's All the World's Aircraft 1949. London: Samson, Low, Marston and Co. Ltd.. p. 234c.
- ↑ Bridgman, Leonard (1951). Jane's All the World's Aircraft 1951. London: Samson, Low, Marston and Co. Ltd.. p. 248c.
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