| Year | 2015 |
| Date | 10-Jul |
| Volume | 215 |
| Issue | 4,512 |
| Page | 112 |
| Category | Hot Air |
| Part | |
| Title | Gallery. Hot Air Engines by Roy Key |
| Author | |
| Notes | Regenerative Stirling Engine, atmospheric engine, Stirling hot air engine, freelance hot air powered water pumping engine |