| Year | 1998 |
| Date | 31-Jul |
| Volume | 181 |
| Issue | 4,073 |
| Page | 140 |
| Category | Hot Air |
| Part | 3 |
| Title | Little Gem. A Twin Cylinder Hot Air Engine |
| Author | Ray McMahon (Northern Ireland |
| Notes | Describes some more components. Frame spacers, finned cylinder barrel, cylinder head and bush, guide tube, power cylinder, lapping |