SNCASE SE.3120 Alouette

The SNCASE SE.3120 Alouette ("Lark") was a utility helicopter developed in France in the early 1950s but which did not enter production. Designed in parallel with the SE.3110, the Alouette shared that machine's dynamic components, with the exception of its unusual twin tail rotor. The Alouette featured an open-framework fuselage behind a cockpit that was enclosed by a bubble canopy. Skid undercarriage and tricycle gear were both tested.

SE.3120 Alouette
Role	Utility helicopter
National origin	France
Manufacturer	SNCASE
First flight	31 July 1951
Status	Prototypes only
Number built	2

The first flight took place on 31 July 1951 with Jean Boulet at the controls. In 1953, he flew one of the two prototype Alouettes to a world closed-circuit distance record for a helicopter in this class, covering 1,250 km (780 mi). Despite this impressive performance, the Alouette proved to be difficult to maintain, and with work on the turbine-powered Alouette II (an unrelated design) already underway, development of the Alouette was soon abandoned.

Specifications

Data from Jane's All The World's Aircraft 1953–54[1]

General characteristics

• Crew: 1
• Capacity: 2 passengers
• Length: 10.45 m (34 ft 3 in)
• Height: 2.90 m (9 ft 6 in)
• Empty weight: 750 kg (1,653 lb)
• Gross weight: 1,250 kg (2,756 lb)
• Powerplant: 1 × Salmson 9NH 9-cylinder air-cooled radial engine, 150 kW (200 hp)
• Main rotor diameter: 11.60 m (38 ft 1 in)
• Main rotor area: 105.7 m² (1,138 sq ft)

Performance

• Maximum speed: 201 km/h (125 mph, 109 kn)
• Endurance: 2​¹⁄₄ hr
• Service ceiling: 4,000 m (13,000 ft)
• Rate of climb: 4.50 m/s (885 ft/min)

References

1. Bridgman 1953, p. 151.

• Bridgman, Leonard. Jane's All The World's Aircraft 1953–54. London: Jane's All The World's Aircraft Publishing Ltd, 1953.
• Eurocopter website
• aviafrance.com