| Year | 2006 |
| Date | 06-Jan |
| Volume | 196 |
| Issue | 4,264 |
| Page | 37 |
| Category | Stationary Engine |
| Part | 1 |
| Title | Designing a Hackworth Valve Engine |
| Author | Colin Pape |
| Notes | A fascinating design study and engine building project. Mr.Hackworth, model engine, basic Hackworth design, comparison with a simple valve drive, the way the Hackworth gear works, more differences compared to a simple valve drive, problems with the Hackworth gear, valve high and low points, non-symmetrical operation |