| Year | 1989 |
| Date | 07-Apr |
| Volume | 162 |
| Issue | 3,846 |
| Page | 422 |
| Category | Hot Air |
| Part | |
| Title | Priam. A Rider Hot Air Engine |
| Author | David Ayre |
| Notes | Discusses some theory and practice. Photos: John Campbell, engine specification, heater design, the hot air competition, burner fuels, development ideas |