| Year | 1930 |
| Date | 25-Dec |
| Volume | 63 |
| Issue | 1,546 |
| Page | 616 |
| Category | Petrol Engine Topics |
| Part | |
| Title | Two-Stroke versus Four-Stroke |
| Author | Edgar T.Westbury |
| Notes | Comparative power curves of two-stroke and four-stroke engines, hypothetical load curve of speed boat, load power curves for four-stroke engined speed boat, for two-stroke engined boat, power characteristics, speed boat engines |