| Year | 2023 |
| Date | 25-Aug |
| Volume | 231 |
| Issue | 4,724 |
| Page | 308 |
| Category | Smoke Rings |
| Part | |
| Title | Unknown Engine |
| Author | |
| Notes | Clarkson 2 x 2 mill engine , Charlie ('Chuck') Barker (York SME), Jason Ballamy, John Hurst (Peterborough SME) (photo courtesy of John Hurst) |