Westland Whirlwind (helicopter) - Variants

Variants

WS-55 Series 1

44 built; American engines (Pratt & Whitney Wasp R-1340-40), transport helicopters for military and civilian use

WS-55 Series 2

19 built; Alvis engines (Alvis Leonides Major 755), civilian use

WS-55 Series 3

5 built; Gnome turboshaft (Bristol Siddeley Gnome 101), civilian use

HAR.1

10 built; RN service; Search and rescue

HAR.2

33 built; RAF service from 1955

HAR.3

25 built; RN service; Wright Cyclone engine

HAR.4

24 built; Improved HAR.2 for hot and high conditions, RAF service

HAR.5

7 built; Alvis Leonides Major engine and a 3 degree droop of the tail boom for increased main rotor clearance; RN service

HAS.7

120 built; RN anti-submarine duties - 1 torpedo; 12 used as Royal Marine transports

HCC.8

2 built; Royal Flight transport, VVIP

HAR.9

6 conversions of HAS.7 with a Bristol Siddeley Gnome gas turbine replacing the Leonides Major engine, RN service

HC.10

RAF service

HAR.10

68 built; powered by a Bristol Siddeley Gnome gas turbine, RAF service, transport and air-sea rescue

HCC.12

2 built; Royal Flight,

The model numbers for the US-built evaluation models were

HAR.21

10 built; rescue. Equivalent to US Marine HRS-2.

HAS.22

15 built; anti-submarine. Equivalent to HO4S-3.