| Year | 2000 |
| Date | 28-Jan |
| Volume | 184 |
| Issue | 4,112 |
| Page | 141 |
| Category | Exhibition |
| Part | |
| Title | The 69th Model Engineer Exhibition at IMS '99. Competition Class Reports. Class A1: Hot Air Engines |
| Author | Julian Wood |
| Notes | Photographs by Gerry Collins and Mike Chrisp. Volute a vee Stirling engine by Tim Oakley, Clive Asher's vacuum engine Poppin |