ABSTRACT 
Experiments are described in which the mean 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 maneuvers. The experimental tech- 
niques are outlined and the dynamometer and data analysis sys- 
tem described. 
The results show that all significant loads except radial 
force are predominantly of hydrodynamic origin. The circum- 
ferential variation of all measured components of blade load- 
ing is primarily a once-per-revolution variation, with the 
variation following approximately the variation of the tan- 
gential wake velocity. 
For sinusoidal pitching of the hull with maximum pitch 
angle of 1.85 degrees and a simulated full scale frequency 
of 0.16 hertz, the peak-to-peak circumferential variation of 
measured forces and moments increased by approximately 50 per- 
cent over the values without hull pitching. 
For simulated operation during an acceleration maneuver, 
the circumferential variation of measured forces and moments 
varied approximately as the product of ship speed and propeller 
rotational speed. At no time during the simulated acceleration 
maneuvers were the circumferential variations of loads as large 
as during 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 reported results of similar experiments on a model 
of the FF-1088. 
ADMINISTRATIVE INFORMATION 
The work reported herein was funded by the Naval Sea Systems Command 
(NAVSEA 033), Task Area S0379-SLOO1, Task 19977. The work was performed 
under David W. Taylor Naval Ship Research and Development Center (DINSRDC) 
Work Unit No. 1544-296. 
The English system of units was used in the original calculations 
presented in this report. Therefore, all data are presented in the 
English units. However, the International System (SI) of metric units are 
shown in the text in parentheses following the English units. 
