| Year | 1930 |
| Date | 16-Jan |
| Volume | 62 |
| Issue | 1,497 |
| Page | 68 |
| Category | Model Aeronautics |
| Part | |
| Title | About Double-surfaced Wings |
| Author | Richard Langley |
| Notes | wing section Eiffel No. 5, properties, properties of section "Clarky", "Falcon" with "Eiffel No. 5, "Falcon" with "Clarky" |