| Year | 1934 |
| Date | 05-Apr |
| Volume | 70 |
| Issue | 1,717 |
| Page | 330 |
| Category | Model Aeronautics |
| Part | 9 |
| Title | Further Steps in Model Aviation. Alternative Tail Units - Lifting and Non-Lifting |
| Author | Sky Pilot |
| Notes | Twin rudders, plan view of twin-ruddered tail, double-surfaced tail units |