| Year | 1973 |
| Date | 02-Nov |
| Volume | 139 |
| Issue | 3,476 |
| Page | 1,072 |
| Category | Hot Air |
| Part | |
| Title | A Hot Air Engine suitable for powering a small boat |
| Author | A.Slack |
| Notes | Displacer piston, displacer cylinder, power piston, engine frame, displacer drive bracket, water hopper, gears |