| Résumé | Testing of the hydrodynamic loading on C-SCOUT's hull has been completed for the purpose of gathering data to input into a numerical manoeuvring model. The 1:10 scale models tested include a baseline version, a longer "full" hull, and a full hull with holes to represent through-body thrusters all models were stripped of appendages. The models were tested in IMD's cavitation tunnel at flow speeds up to 4 m/s, and a wide variety of yaw angles. A six-component balance was used to measure all hydrodynamic forces and moments. Vortex-induced vibrations limited the range of testable flow speeds. Inconsistent behaviour of the support for the model caused significant error in the results. The results are hence considered to be of qualitative value only. The data show definitive trends that generally agree with expectations, although the stall angle of the hull, near 50°, was unusually large. Two different methods were used to calculate the centre of effort, and their results were compared. Due to the scatter in the load data, the calculated centres of effort are not considered reliable. More testing is recommended. If it is not possible to complete full-scale tests, the model support should be stiffened to reduce vibration problems, and the foil should be redesigned so it behaves more consistently. Tests of the full hull with through-body thruster holes should be conducted at higher yaw angles. |
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