Engineering:Showers Skytwister Choppy
| Skytwister Choppy | |
|---|---|
| Role | Helicopter |
| National origin | United States |
| Manufacturer | Showers-Aero |
| First flight | 1992 |
| Status | Plans no longer available (2015) |
| Number built | 12 (1998) |
The Showers Skytwister Choppy is an American helicopter that was produced by Showers-Aero of Milton, Pennsylvania, introduced in 1992. Now out of production, when it was available the aircraft was supplied in the form of CAD plans for amateur construction.[1][2]
Design and development
The Skytwister is a modernized and updated version of the Adams-Wilson Hobbycopter, also called the "Choppy", as redesigned by Ben Showers.[1][2]
The Skytwister was designed to comply with the US Experimental - Amateur-built aircraft rules. It features a single main rotor, a two-bladed tail rotor, a single-seat open cockpit with a windshield and skid-type landing gear. The standard engine used is a twin cylinder, liquid-cooled, two-stroke, dual-ignition 64 hp (48 kW) Rotax 582 powerplant with a 2.58:1 reduction drive, which replaces the original Choppy's motorcycle engine.[1]
The aircraft fuselage is made from bolted-together aluminum tubing. Its two-bladed Fleck 2706 aluminium alloy main rotor is made as an extrusion and has a 21.50 ft (6.6 m) diameter. The tail rotor has a diameter of 36 in (91.4 cm). The aircraft has an empty weight of 320 lb (145 kg) and a gross weight of 670 lb (304 kg), giving a useful load of 350 lb (159 kg). With full fuel of 5 U.S. gallons (19 L; 4.2 imp gal) the payload for pilot and baggage is 320 lb (145 kg).[1]
The designer estimated the construction time from the supplied plans as 300 hours.[1]
Operational history
By 1998, the company reported that 200 sets of plans had been sold and 12 aircraft were completed and flying.[1]
By April 2015, no examples were registered in the United States with the Federal Aviation Administration, although a total of one had been registered at one time.[3]
Specifications (Skytwister)
Data from Purdy and All-Aero[1][2]
General characteristics
- Crew: one
- Length: 15 ft 8 in (4.78 m)
- Width: 5 ft 8 in (1.73 m)
- Height: 6 ft 8 in (2.03 m)
- Empty weight: 320 lb (145 kg)
- Gross weight: 670 lb (304 kg)
- Fuel capacity: 5 U.S. gallons (19 L; 4.2 imp gal)
- Powerplant: 1 × Rotax 582 twin cylinder, liquid-cooled, two stroke aircraft engine with a 2.58:1 reduction drive, 65 hp (48 kW)
- Main rotor diameter: 21 ft 6 in (6.55 m)
- Main rotor area: 363 sq ft (33.7 m2)
Performance
- Maximum speed: 85 mph (137 km/h, 74 kn)
- Cruise speed: 65 mph (105 km/h, 56 kn)
- Rate of climb: 1,000 ft/min (5.1 m/s)
- Disk loading: 1.8 lb/sq ft (8.8 kg/m2)
See also
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Purdy, Don: AeroCrafter - Homebuilt Aircraft Sourcebook, Fifth Edition, page 331. BAI Communications, 15 July 1998. ISBN:0-9636409-4-1
- ↑ 2.0 2.1 2.2 AllAero (2015). "Ben Showers Aero Skytwister". http://all-aero.com/index.php/component/content/article/35-helicopters/copters/1519-ben-showers-aero-skytwister. Retrieved 5 April 2015.
- ↑ Federal Aviation Administration (5 April 2015). "Make / Model Inquiry Results". http://registry.faa.gov/aircraftinquiry/AcftRef_Results.aspx?Mfrtxt=&Modeltxt=SKYTWISTER&PageNo=1. Retrieved 5 April 2015.
External links
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