Eurocopter - EC 725 Resco
Texte & photos : Marc Arys - S.B.A.P.©
The EC 725 Cougar helicopter, developed by Eurocopter, made his first flight in November 2000 with first delivery for the French Air Force in its 'Combat Search and Recue Role' (CSAR) in February 2005.
The new EC 725 is based on the proven design of the Cougar Mk 2 with a new five-bladed main rotor and a basic empty weight without fuel of 7.100 kg. To get the EC725 qualified for CSAR Operations requirements, Eurcopter had increased the MTOW to 11.000 kg (11 Tons).
The EC 725 is equipped with an all-glass cockpit with new avionics and a new integrated display system including a digital map. The displays can be configured to suit the operational requirements to flight, navigation and mission parameters.
The Advanced Helicopter Cockpit and Avionics System (AHCAS) includes an automatic flight control system developed by SAGEM, integrating the flight, navigation and tactical mission data.
For communications it relies on VHF and HF as well as on a SATCOM/DATALINk communication system. A KY100, crypto key device is also at hand to secure UHF transimssions.
The helicopter is also equipped with radar and FLIR (forward looking infrared) for day and night time search and rescue capability. The navigation suite includes Bendix Doppler radar, global positioning system and inertial navigation system. The Search and Rescue system can be programmed to provide automatic search patterns, transition and hover with a 4 axis digital autopilot.
It is also equipped with twin ILS, single MLS, 1 TACAN and twin DME.
The helicopter can carry side-firing armament such as two 7.62mm machine guns (1.000 rounds) and a 20mm cannon and its electronic warfare systems include a radar warning receiver, laser warning receiver, missile approach warner and chaff and flare dispensers.
The cabin, fuel cells, gearbox and gunners stations are armour plated for protection.
The helicopter is powered by two Turbomeca Makila 2A engines, each providing 2.500 HP. An infrared suppression system is installed to reduce the thermal signature of the helicopter.
The fuel tanks, with a capacity of 2,539 litres, are installed under the floor of the cabin and in the lateral sponsons. Auxiliary tanks can be installed in the cargo hook bay (capacity: 324 litres) or at the rear of the cabin (990 litres). The cargo hook bayfuel tank is releasable in case of engine trouble to get the TOW below MTOW 'single engine' (the single engine Cat A performance envelope.
With a full fuel load flight autonomy is almost 6 hours.
The helicopter can also be equipped with an air-to-air in flight refuelling probe.
The EC 725 main gearbox is reinforced and uses the gear train identical to that of the Cougar Mk 2. An emergency lubrication spray (glycol based) is installed in the gearbox to allow a 30-minute flight with no oil.
In the troop transport role the helicopter can carry 19 troops over a 250nm radius of action. In the combat search and rescue role, the EC 725 is able to rescue a downed crew at a radius of action of 280nm.
The helicopter is fitted with a dual hoist system (75m and 60m), one of wich has a hoisting speed of 1-2 meter/second.
It also has a sling capacity of 5t.
The helicopter has new "Spheriflex" main and tail rotorheads. The five-bladed main rotor is fully composite with anhedral tipcaps and can be folded as on the NH90.
The rotors and horizontal stabilizer are equipped with an electric de-icing system. Installed are metal resistors for the main- and carbon resitors for the tail rotor.
|Main rotor diameter||
|Tail rotor diameter||
|Height to top of main rotor head||
|Maximum take-off weight||
|CSAR basic empty weight||
|Fast cruise speed||
|Never exceed speed, VNE||
|Hover ceiling at 20° ISA temperature (in ground effect)||
800 nm at 5.000ft
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