Niki 2004
# Niki 2004

The Niki 2004 is a family of Bulgarian autogyros, designed and produced by Niki Rotor Aviation of Pravets. The aircraft is supplied as a kit for amateur construction or as a complete ready-to-fly-aircraft.

## Design and development

The Niki 2004 features a single main rotor, a two-seats-in side-by-side configuration enclosed cockpit, tricycle landing gear and a four-cylinder, air-cooled, four-stroke, single-ignition 150 hp (112 kW) Subaru EJ22 auto-conversion engine in pusher configuration.

The aircraft fuselage is made from monocoque aluminum sheet, with a steel rotor mast and the twin tails supported by aluminium tubing. The series uses American-made Vortech and SportCopter rotor blades with a 9.14 m (30.0 ft) diameter and a chord of 20 cm (7.9 in). The 2004M model has an empty weight of 350 kg (772 lb) and a gross weight of 550 kg (1,213 lb), giving a useful load of 200 kg (441 lb).

## Variants

### 2004

    Original version with a gross weight of 450 kg (992 lb), a fuselage length of 3.90 m (12.8 ft) and a cruise speed of 130 km/h (81 mph).

### 2004M

    Stretched version with a fuselage length of 4.225 m (13.9 ft) and a cruise speed of 130 km/h (81 mph).

### 2008

    Improved version with a gross weight of 450 kg (992 lb), a fuselage length of 4.225 m (13.9 ft) and a cruise speed of 150 km/h (93 mph).

## Specifications (2004M)

Data from Bayerl

General characteristics

* Crew: one
* Capacity: one passenger
* Empty weight: 350 kg (772 lb)
* Gross weight: 550 kg (1,213 lb)
* Fuel capacity: 70 litres (15 imp gal; 18 US gal)
* Powerplant: 1 × Subaru EJ22 four cylinder, air-cooled, four-stroke, single-ignition automotive engine, 110 kW (150 hp)
* Main rotor diameter: 9.14 m (30 ft 0 in)
* Propellers: 4-bladed composite

Performance

* Maximum speed: 150 km/h (93 mph, 81 kn)
* Cruise speed: 130 km/h (81 mph, 70 kn)
* Rate of climb: 5 m/s (980 ft/min)
