| Year | 1941 |
| Date | 17-Apr |
| Volume | 84 |
| Issue | 2,084 |
| Page | 316 |
| Category | Improving the Two-Stroke |
| Part | |
| Title | Crankcase Compression |
| Author | Edgar T.Westbury |
| Notes | A "flat-top" 15 c.c. two-stroke by P.Ribbeck, why crankcase compression is necessary, Mr Ribbeck's engine showing displacer piston, the engine further dismantled, the engine of M. Suzor's Canard, increasing crankcase displacement |