Improved HAR.2 for hot and high conditions, 24 built for RAF. Many survivors converted to HAR.10. 
Specifications | |
List of Operators of Westland Whirlwind HAR.4 | |
| From | Organisation with model Whirlwind HAR.4 | |||||
| 1955 |
| |||||
| Construction Numbers on database of Whirlwind HAR.4 | ||||||
| ||||||
Construction Numbers | Help Us | |
| C/N | Year | History | |
| wa 20 | 1954 |  XD163 | |
| wa 21 | 1954 | XD164 | |
 | wa 22 | 1954 | XD165 |
| wa 25 | 1954 | XD182 |
wa 26  | 1954 | XD183 | |
| wa 27 | 1954 | 8787M,XD184 |
| wa 28 | 1954 | XD185 | |
| wa 29 | 1954 | 8730M,XD186 |
| wa 30 | 1954 | XD187 | |
| wa 31 | 1954 | XD188 | |
| wa 33 | 1954 | G-BKHB,N7013H,XD777,XJ407 | |
| wa 34 | 1954 | XD778,XJ408 | |
| wa 35 | 1954 | XD779,XJ409 | |
| wa 36 | 1954 | XD780,XJ410 | |
wa 37  | 1954 | XD781,XJ411 | |
| wa 38 | 1954 | XD782,XJ412 | |
| wa 40 | 1954 | XD783,XJ413 | |
| wa 41 | 1954 | XD784,XJ414 |
| wa 42 | 1954 | XD795,XJ426 | |
| wa 43 | 1954 | XD796,XJ427 | |
| wa 44 | 1954 | XD797,XJ428 |
| wa 45 | 1955 | XD798,XJ429 |
| wa 46 | 1955 | XD799,XJ430 | |
| wa 47 | 1955 | XD800,XJ431 | |
| wa 48 | 1955 | XD801,XJ432 | |
| wa 49 | 1955 | XD802,XJ433 | |
| wa 51 | 1955 | XD804,XJ435 |
| wa 53 | 1955 | XD806,XJ437 | |
| wa107 | 1956 | XJ761 |