| Year | 1940 |
| Date | 25-Jan |
| Volume | 82 |
| Issue | 2,020 |
| Page | 79 |
| Category | Model Aeronautics |
| Part | |
| Title | Theory and Practice of Model Aeroplane Building |
| Author | Lawrence H.Sparey |
| Notes | Propellers, a semi-scale petrol-engined model leaving the launching pad, propeller shape marked on a block of wood, finished propeller stained and polished, a group of small wood plane |