| Year | 1929 |
| Date | 21-Feb |
| Volume | 60 |
| Issue | 1,450 |
| Page | 174 |
| Category | Model Marine Notes |
| Part | 16 |
| Title | Model Yacht Design |
| Author | "Kappa" |
| Notes | The Longitudinal Lines. Trochoids vary in shape from cycloids to straight lines, a punt and its displacement curve, principal losses in the diverging streams, power in the fin, sheer line, lateral plane, rudder and skeg of aeroplane |