| Year | 1939 |
| Date | 20-Jul |
| Volume | 81 |
| Issue | 1,993 |
| Page | 81 |
| Category | Model Aeronautics |
| Part | |
| Title | Theory and Practice of Model Aeroplane Building |
| Author | Lawrence H.Sparey |
| Notes | Wing profiles, Clark Y, Effiel 400, Gottingen 534, U.S.A. 27 (similar to Grant 8x), Grant 8x, an all-balsa monoplane of American design powered by a 3.5 c.c. "Bunch" engine, portion of wing |