Aérospatiale Alouette II

1st Flight 1955

Military Users-

Tunisian Air Force, Austrian Air Force, Belgian Army, Military of Benin, Brazilian Air Force, Biafran armed forces, Royal Cambodian Air Force, Cameroon Air Force, Central African Republic Air Force, Congolese Air Force, Djibouti Air Force, Dominican Air Force, French Air Force, French Army, French Navy, German Army, German Federal Police, German Air Force, Guinea-Bissau Air Force, Indonesian Army, Indonesian Navy, Israeli Air Force, Ivory Coast Air Force, Katangese Air Force, Khmer Air Force, Royal Lao Air Force, Lebanese Air Force, Malagasy Air Force, Mexican Navy, Netherlands Air Force, Peruvian Army, Portuguese Air Force, National Republican Guard, Rhodesian Air Force, Senegalese Air Force, South African Air Force, Swedish Air Force, Swedish Army, Swiss Air Force, Turkish Air Force, United Kingdom Army Air Corps, Air Force of Zimbabwe.

Alouette II

The Aérospatiale Alouette II is a French light helicopter, incorporating many innovations of its time.

It was powered by a single Turbomeca Artouste II turboshaft engine capable of generating a maximum output of 400 hp.

Alouette II

The speed of the main rotor is controlled by an automated fuel supply governor, eliminating the necessity of a twist-grip throttle and a conventional link between the throttle and the collective-pitch.

Instead, the Alouette II uses a simple control lever arrangement, which acts to directly regulate the collective-pitch and actuate the governor while immediately and automatically applying the correct level of power to conform with flight condition.

Without a clutch, the transmission is considerably simplified in both design and maintenance aspects.

Alouette II

Despite being a light helicopter, the Alouette II possesses a reasonable lift capacity and can carry under slung loads on an external sling, during one high-profile public demonstration, one helicopter was able to air-lift a compact Citroen truck weighing in excess of half a ton without visible difficulty.

While flying at sea level, the Alouette II uses only 300 of the power plant’s available 400 hp, accordingly, performance can be maintained while operated at a high altitude and within tropical conditions where the additional power would come into play.

It was capable of flying at altitudes of up to 2,286 meters above sea level while possessing an average climb rate of 250 meters per minute and a typical maximum range of 563 miles.

Alouette II

Various alternative landing gear configurations could be fitted, including skids, wheels, or pontoons.

The Alouette II is capable of accommodating a seating arrangement for up to five personnel, including the pilot, access to the cabin was provided via a pair of side-hinged doors.

The compact cockpit was provided with a dome-shapred windscreen which provided for excellent levels of external visibility.

Alouette II

The Alouette II also made innovative use of armaments.

It was the first helicopter worldwide to be equipped with anti-tank munitions in the form of the SS.11 MCLOS wire-guided anti-tank missile.

In addition to anti-tank missiles, the French Army chose to arm their Alouette IIs with machine guns, while the French Navy outfitted theirs with aerial torpedoes to conduct anti-submarine warfare (ASW) duties.

Alouette II

Under operational conditions, the Alouette II often proved to be a relatively maintenance-intensive rotorcraft.

It required a high level of regular lubrication, the main rotor head alone featuring 20 grease nipples that had to be re-lubricated after every five flight hours, while the drive shaft for the tail rotor was similarly demanding.

Due to its high susceptibility to dust ingestion, some operators would have to remove the Alouette’s rectangular sand filters after every landing in order to clean them.

Alouette II

Specifications-

Crew: 1

Capacity: 4 passengers

Length: 9.66 m (31 ft 8 in) (overall, blades folded)

Height: 2.75 m (9 ft 0 in)

Empty weight: 895 kg (1,973 lb)

Max takeoff weight: 1,600 kg (3,527 lb)

Fuel capacity: 580 L (150 US gal; 130 imp gal)

Alouette II

Power plant: 1 × Turbomeca Artouste IIC6 turboshaft, 400 kW (530 shp)

Main rotor diameter: 10.20 m (33 ft 6 in)

Main rotor area: 81.7 m2 (879 sq ft)

Performance

Maximum speed: 185 km/h (115 mph, 100 kn) at sea level

Cruise speed: 170 km/h (110 mph, 92 kn)

Range: 565 km (351 mi, 305 nmi) (with maximum fuel)

Endurance: 4.1 hr

Service ceiling: 2,300 m (7,500 ft)

Rate of climb: 4.2 m/s (820 ft/min)

Alouette II

Credits-

Aeroscopia Museum, Toulouse, France

Helicopters: An Illustrated History of Their Impact-Stanley McGowen

Jane’s pocket guide: Modern military helicopters- Tim Ripley

Wikipedia.

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