| Year | 2019 |
| Date | 10-May |
| Volume | 222 |
| Issue | 4,612 |
| Page | 700 |
| Category | Stationary Engine |
| Part | 3 |
| Title | The Mackworth Six Cylinder Rotary Engine |
| Author | Kevin Barry |
| Notes | Presents a compact stationary rotary engine. The control valve, assembly, testing, future developments |