15.06.2009
FLUG REVUE

Paris Air Show: Latest variant of the AW101 makes debut

AgustaWestland brought t the latest variant of the AW101 medium lift helicopter to the Paris Air Show. It AW101 features new more efficient main rotor blades, new more powerful engines, a new cockpit display system and a new up rated tail rotor.

The new main rotor blades, developed under the fourth British Experimental Rotor Programme and known as BERP IV technology blades, incorporate an improved plan form, new aerofoil sections and an advanced aero elastically tailored structure to provide reduced vibration, 10 knots additional cruise speed and 650 kg additional lift capability over the previous AW101 main rotor blades.

The blades first flew in September 2006 and have now completed a flight test programme during which the AW101 was flown at speeds up to 198 knots and at altitudes of 13,000 ft. Aircraft fitted with BERP IV blades have also been flown at weights up to 16,500 kg - 1,900 kg over the normal Merlin gross weight and 900 kg over the current AW101 maximum gross weight.

The more powerful General Electric CT7-8E engines, rated at 2,527 shp (1884 kW) each for take-off, provide 12 percent more power than previous CT7-family engines, increasing the AW101’s payload by over 900 kg (2,000 lbs) when operating in hot conditions at high altitudes. Following an extensive flight test programme the CT7-8E engines are now certified and have proved totally reliable during all phases of testing.

The new fully integrated flight and mission cockpit display system utilizes five 25 cm x 20 cm (10 in x 8 in) LCD main displays that give AW101 pilots 70 percent more display area enhancing their management of flight, system and mission data.

The new fully articulated tail rotor has been designed to take advantage of the extra power available from the engines and to allow the AW101 to operate at its current 15,600 kg maximum all up weight as well as future higher take off weights. The new tail rotor gives the same excellent control margins as the original tail rotor design but at the higher weights, including the ability to hover in 40 knot crosswinds.

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