Eurofly Viper

The Eurofly Viper is an Italian ultralight trike, designed and produced by Eurofly Srl of Galliera Veneta. The aircraft is supplied as a complete ready-to-fly-aircraft.[1]

Viper
Role Ultralight trike
National origin Italy
Manufacturer Eurofly Srl
Status In production (2013)

Design and development

The aircraft was designed to comply with the Fédération Aéronautique Internationale microlight category, including the category's maximum gross weight of 450 kg (992 lb). The Viper has a maximum gross weight of 450 kg (992 lb). It features a cable-braced hang glider-style high-wing, weight-shift controls, a two-seats-in-tandem open cockpit, tricycle landing gear with wheel pants and a single engine in pusher configuration.[1]

The aircraft is made from welded tubing, with its double surface wing covered in Dacron sailcloth. Its 10.5 m (34.4 ft) span Skyrider Hazard 12 wing is supported by a single tube-type kingpost and uses an "A" frame weight-shift control bar. The standard powerplant is a twin cylinder, liquid-cooled, two-stroke, dual-ignition 64 hp (48 kW) Rotax 582 engine, with the twin cylinder, air-cooled, two-stroke, dual-ignition 50 hp (37 kW) Rotax 503 engine optional. The Viper has an empty weight of 126 kg (278 lb) and a gross weight of 450 kg (992 lb), giving a useful load of 324 kg (714 lb). With full fuel of 65 litres (14 imp gal; 17 US gal) the payload is 277 kg (611 lb).[1]

A number of different wings can be fitted to the basic carriage, including the Skyrider Hazard 12 and Hazard 15. A 70 litres (15 imp gal; 18 US gal) fuel tank is optional.[1]

A basic version of the aircraft, powered by the 50 hp (37 kW) Rotax 503 engine and without fairings is also offered.[1]

Specifications (Viper with Hazard 12 wing)

Data from Bayerl[1]

General characteristics

  • Crew: one
  • Capacity: one passenger
  • Wingspan: 10.5 m (34 ft 5 in)
  • Wing area: 12 m2 (130 sq ft)
  • Empty weight: 126 kg (278 lb)
  • Gross weight: 450 kg (992 lb)
  • Fuel capacity: 65 litres (14 imp gal; 17 US gal)
  • Powerplant: 1 × Rotax 582 twin cylinder, liquid-cooled, two stroke aircraft engine, 48 kW (64 hp)
  • Propellers: 2-bladed wooden

Performance

  • Maximum speed: 160 km/h (99 mph, 86 kn)
  • Cruise speed: 125 km/h (78 mph, 67 kn)
  • Stall speed: 48 km/h (30 mph, 26 kn)
  • Rate of climb: 8 m/s (1,600 ft/min)
  • Wing loading: 37.5 kg/m2 (7.7 lb/sq ft)

References
  1. Bayerl, Robby; Martin Berkemeier; et al: World Directory of Leisure Aviation 2011-12, page 211. WDLA UK, Lancaster UK, 2011. ISSN 1368-485X
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