| Model | Horsepower | Year(s) |
|---|---|---|
| RD-17C | 25 | 1955 |
| RD-18 | 30 | 1956 |
| RD-19 | 35 | 1957 |
| RD-19C | 35 | 1958 |
| RD-21 | 35 | 1959 |
| RD-22 | 40 | 1960 |
| RD-23 | 40 | 1961 |
| RD-24 | 40 | 1962 |
| RD-25 | 40 | 1963 |
| RD-26 | 40 | 1964 |
| RD-27 | 40 | 1965 |
| RD-28 | 40 | 1966 |
| RD-29 | 40 | 1967 |
| RD-30 | 40 | 1968 |
| RDE-16 | 25 | 1954 |
| RDE-17 | 25 | 1955 |
| RDE-17C | 25 | 1955 |
| RDE-18 | 30 | 1956 |
| RDE-19 | 35 | 1957 |
| RDE-19C | 35 | 1958 |