title: Eurofly Viper
text: # 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.
  
  ## 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.
  
  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).
  
  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.
  
  A basic version of the aircraft, powered by the 50 hp (37 kW) Rotax 503 engine and without fairings is also offered.
  
  ## Specifications (Viper with Hazard 12 wing)
  
  Data from Bayerl
  
  General characteristics
  
  * Crew: one
  * Capacity: one passenger
  * Wingspan: 10.5 m (34 ft 5 in)
  * Wing area: 12 $m^2$ (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 $kg/m^2$ (7.7 lb/sq ft)
  