The time-average and unsteady loads were measured on a single blade of a model of the controllable-pitch propeller on the DD-963 Class Destroyer. The experiments were conducted behind a model of the DD-963 hull under steady ahead operation, hull pitching motions, and simulated acceleration manuevers.
The results show that all significant loads except radial force are predominantly of hydrodynamic origin. The circumferential variation of all measured components of blade loading is primarily a once-per-revolution variation, with the variation following approximately the variation of the tangential wake velocity.
The results show that unsteady loads are increased substantially by dynamic pitching of the model hull. For a simulated acceleration maneuver the circumferential variations of the loads are smaller than for full power steady ahead operation.
For steady ahead operation, circumferential variation of loading determined from the model experiments agreed fairly well with full-scale data, but was substantially larger than the theoretically calculated values.
For all conditions evaluated, the results follow close to previously published results of similar experiments on a model of the FF-1088.