The Nord 1750 Norelfe was a 1950s French three-seat helicopter built by Nord Aviation and designed by Jean Cantinieau.

Development

The 1750 Norelfe was based on the Matra-Cantinieau MC-101A, an earlier helicopter designed by Jean Cantinieau. It had a single main rotor, with torque control through a movable duct at the end of the tailboom. Powered by a Turbomeca Artouste turboshaft, the first of two Norelfes flew on 28 December 1954.^[1]

The company sold the two helicopters and the design rights to Aerotécnica of Spain who redesignated them the Aerotécnica AC-13A.^[1] Aerotécnica went on to produce a larger five-seat version, the Aerotécnica AC-14 which was used by the Ejército del Aire (Spanish Air Force).

Specifications (AC-13A)

Data from Jane's All the World's Aircraft 1958-59^[2]

General characteristics

• Crew: 1
• Capacity: 2 pax
• Length: 7.48 m (24 ft 6 in)
• Height: 2.75 m (9 ft 0 in) to top of rotor pylon
• Empty weight: 575 kg (1,268 lb)
• Gross weight: 880 kg (1,940 lb)
• Fuel capacity: 115 L (30 US gal; 25 imp gal)
• Powerplant: 1 × Turbomeca Artouste I turboshaft, 130 kW (170 hp) at transmission (rated to 260 shp (194 kW))
• Main rotor diameter: 9.04 m (29 ft 8 in)
• Main rotor area: 64 m² (690 sq ft)

Performance

• Maximum speed: 140 km/h (87 mph, 76 kn)
• Cruise speed: 124 km/h (77 mph, 67 kn)
• Range: 140–345 km (87–214 mi, 76–186 nmi)
• Service ceiling: 6,065 m (19,898 ft)
  
• Hover ceiling IGE: 2,650 m (8,694 ft)
• Rate of climb: 4.6 m/s (910 ft/min)