| Year | 2006 |
| Date | 24-Nov |
| Volume | 197 |
| Issue | 4,287 |
| Page | 609 |
| Category | Correction |
| Part | 2 |
| Title | Overhead Valve Engines |
| Author | Colin Pape (France) |
| Notes | Corrected the problems with his 'Step 1' engine. Building notes, valve shaft or rotor, lining up the valve drive and the cylinder, step 2 the first compound engine, some history |