| Year | 2016 |
| Date | 19-Aug |
| Volume | 217 |
| Issue | 4,541 |
| Page | 296 |
| Category | Hot Air |
| Part | 2 |
| Title | An Undertype Hot Air Engine |
| Author | Alan Pickering |
| Notes | A unique design for an engine with speed control. Rocking beams, the displacer cylinder, connecting rods, stainless towers |