From the Augusta Westland website here is the 139 spec. It has more 'disposable' than an S61 and an ROA that makes it ideal to join Lee on Solent and Portland, both of which have the smallest areas of responsibility for SAR cabs in the UK. In most circumstances it will CLIMB away from an engine failure in the hover and it will have the following brand new SAR toys: TCAS, AIS, SATCOM, SATTRACK, FLIR (plus laser), TETRA, none of which presently exist in our S61s and all of which will greatly enhance our SAR capability. For these reasons, I stand by my statement that it should be a pretty capable ship.
Weights
Max take Off 6400 kg 14112 lb
Max Useful Load 2778 kg 6124 lb
Engine Rating (2 x Pratt & Whitney PT6C-67C)
Take Off 1252 kW 1679 SHP
Maximum continuous 1142 kW 1531 SHP
Transmission Rating
Take Off n.a. kW n.a. SHP
Max continuous n.a. kW n.a. SHP
Fuel Capacity
standard 1562 l 413 USG
Auxiliary 500 l 132 USG
Crew
Pilot / Passengers 1 / 15
External Dimensions
Length (rotors turning) 16,65 m 54,63 ft
Overall height 4,95 m 16,24 ft
Main rotor diameter 13,80 m 45,28 ft
Performance (At MTOW - ISA)
VNE 310 km/h 167 kts
Max cruise speed 290 km/h 157 kts
Rate of climb >10 m/s >2000 ft/min
Hovering IGE m 15660 ft
Hovering OGE >3600 m 12014 ft
Service ceiling m 19460 ft
Max Range 568 km NM
Max endurance 3 h 54 min