Improved commercial version with 800HP Wright R-1300-3 Cyclone engine. 
List of Operators of S-55B |
| Years | Model | Org | |
|---|---|---|---|
| 1956/61 |  Chicago Helicopter Airways |
Global Distribution of S-55B |
|
Construction Numbers |
| C/N | Year | History | |
|---|---|---|---|
| 55-027 | 1951 | 127793,N4597CJ,N49557S | |
| 55-648 | 1954 | 52-7620,N75215 | |
| 55-883 | 1955 | N155GW,N744A | |
| 55-1003 | 1956 | CF-MEV,N873 | |
| 55-1004 w/o 1981 | 1956 | N874 | |
| 55-1005 | 1956 | C-GSWL,N855TC,N875,N875W |
