| Year | 1939 |
| Date | 06-Jul |
| Volume | 81 |
| Issue | 1,991 |
| Page | 8 |
| Category | Model Aeronautics |
| Part | |
| Title | Theory and Practice of Model Aeroplane Building |
| Author | Lawrence H.Sparey |
| Notes | Lightened edition of the "Kestrel" 5 c.c. engine, a 1.75 c.c. engine, the R.A.F. 32 aerofoil, the Gottingen 387 section |