| Year | 1954 |
| Date | 14-Oct |
| Volume | 111 |
| Issue | 2,786 |
| Page | 460 |
| Category | Nautical |
| Part | |
| Title | Model Power Boat Propulsion |
| Author | R.H.Mapplebeck |
| Notes | Suggestions for the Design and Calibration of Propellers for Prototype Boats. Adjustable propeller blades, the author, simple generator for indicating engine speed, meter scale |