| Year | 1940 |
| Date | 13-Jun |
| Volume | 82 |
| Issue | 2,040 |
| Page | 564 |
| Category | Model Aeronautics |
| Part | |
| Title | American aerofoils, further "Elf" instructions |
| Author | Lawrence H.Sparey |
| Notes | Bob Copland with his machine (world's duration record holder), Mr Clark of the Northern Heights FC with his Empire flying boat |