unsteady blade loads in inclined flow. Numerical computations to check 
this hypothesis are planned. 
SUMMARY AND CONCLUSIONS 
Experiments were described in which the mean and unsteady loads, 
including hydrodynamic, centrifugal, and gravitational loads, were mea- 
sured on a single blade of a model of a CP 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 discussion of experimental techniques in- 
cludes a description of the dynamometer and data analysis system. The 
results are summarized as follows: 
1. For all significant loading components, except for radial force, 
the loads are predominantly of hydrodynamic origin. 
2. The circumferential variations of all measured components of 
hydrodynamic and total blade loading are primarily a first harmonic, with 
maximum and minimum values occurring near the blade angular position which 
is 25 degrees past the position at which a radial line from the propeller 
axis to the tip is horizontal. 
3. For steady-ahead operation: 
a. The maximum values and peak-to-peak circumferential varia- 
tions for measured hydrodynamic forces and bending moments were up 
to approximately 1.43 and 0.91 of the time-average values, 
respectively. 
b. The maximum values and the peak-to-peak circumferential 
variations for measured total forces and bending moments were up to 
approximately 1.41 and 0.88 of the time-average values, respectively. 
c. The model results for circumferential variation of bending 
moments about the nose-tail lines of the 0.3 and 0.4 radii agreed 
fairly well with loads deduced from strain measurements on the full- 
scale propeller, but they were larger than theoretically calculated 
values. 
48 
