Aircraft Data Sheet: WS-55 Whirlwind Series 3, HAR 9 & HAR 10

First flight:	28th February 1959
Rotor diameter:	16.15m/53ft 0ins
Length:	18.94m/62ft 1ins
Max weight:	3,538 kg/7,800lb
Max speed:	175kph/95knots
Power:	One 1,050shp/783kW Rolls-Royce Gnome H-1000 turboshaft
Accommodation:	Two pilots plus ten
No Built:	75

The installation of a single Rolls-Royce Gnome turboshaft engine into the Whirlwind airframe represented a considerable improvement, used primarily in the SAR role, this version was generally accepted as a major improvement on the basic S-55 from which it was derived.