| Year | 1950 |
| Date | 21-Dec |
| Volume | 103 |
| Issue | 2,587 |
| Page | 956 |
| Category | Petrol Engine Topics |
| Part | |
| Title | A 10 c.c. Twin Four-Stroke. "Seagull" |
| Author | Edgar T.Westbury |
| Notes | Crankcase for single-cylinder adaptation, sump, single-throw crankshaft, air-cooled cylinders, a "flat quad" engine? Castings and supplies |