Utility observation helicopter for US Army, 4 built. Two modofied into S-59 / XH-39 turbine powered prototypes.
| C/N | Year | History |
| 52-005 | 1951 |  49-2888 : Sikorsky S-52-2, c/n 52-005, ff:?; acc 29Mar51; del US +
|
| 52-006 | 1951 | 49-2889 : Sikorsky S-52-2, c/n 52-006, ff:?; acc 29Mar51; del US +
N54066 :  S-52-2 wfu & reg US as S-52-2, N54066, unk.
|
 | 52-007 | 1951 | 49-2890 : Sikorsky S-52-2, c/n 52-007, ff:?; acc 29Mar51; del US +
s-59 modified to S-52-5, YH-18B configuration, unk; modified+
26aug54 XH-39 set a world speed record for a helicopter+
|
| 52-008 | 1951 | 49-2891 : Sikorsky S-52-2, c/n 52-008, ff:?; acc 17Apr51; del US +
s-59 modified to S-59/XH-39A prototype, c/n 59-002, 49-2891,+
rtnd to YH-18A configuration, unk.
N7741 : S-52-2 wfu & reg US as S-52-2, N7741, unk.
|
4 C/N.