Ten Sikorsky HRS-2 for UK Royal Navy as Whirlwind HAR.21. 
List of Operators of Sikorsky Whirlwind HAR.21 | |
| From | Organisation with model Whirlwind HAR.21 | |||||
| 1952 |
| |||||
Construction Numbers | Help Us | |
| C/N | Year | History | |
55-280  | 1952 |   130182,WV189 | |
55-281  | 1952 | 130183,WV190 | |
| 55-282 | 1952 | 130184,WV191 | |
| 55-283 | 1952 | 130185,WV192 | |
| 55-284 | 1952 | 130186,WV193 | |
| 55-285 | 1952 | 130187,WV194 | |
| 55-286 | 1952 | 130188,WV195 | |
| 55-287 | 1952 | 130189,WV196 | |
| 55-288 | 1952 | 130190,WV197 | |
| 55-289 | 1952 | 130191,WV198 |