Nord N.1700 Norelic
The Societe Nationale de Constructions Aeronautiques du Nord (Nord-Aviation) built its first helicopter prototype in 1947. The N.1700 was a two-place aircraft; the rotor had two blades with a stabilizer bar. The engineer Andre Bruel wanted to get rid of the cyclic control, considered too complex. The rotor head was installed on an articulated parallelogram, allowing lateral motions. The lateral control was obtained by relative displacement of the rotor head in relation to the center of gravity.
Collective pitch and also cyclic pitch were respectively controlled by the radial and the flapping movements of small auxiliary blades set at 90° to the main blades. In this helicopter, the anti-torque device consisted of a fixed-pitch airscrew placed at the end of the tail and blowing backwards on to an assembly of suitably adjusted vanes.
The 160hp Mathis GR7 engine directly powered a rear axial helix which blew on two flap shutter systems, some horizontal, some vertical, to control pitch and yaw. The aircraft was damaged at first, due to violent vibrations of transmission, induced by brutal clutching. Alter repairing it, they resumed power checks but, in the hands of an inexperienced pilot, it hit an obstacle.
Management decided then to abandon the N.1700 and to turn to a smaller aircraft, the single seat N.1710.
Engine: 1 x Mathis GR7, 170hp
Rotor diameter: 10m
Gross weight: 800kg
Empty weight: 510kg
Inclined climb: 177m/min
Cruising speed: 130km/h
Absolute ceiling: 3000m