circumferential variation of loads with blade angular position on CP pro- 
pellers behind a hull under a wide range of operating conditions. An ex- 
perimental program was therefore undertaken to measure the six components 
of loading (Figure 1)* on model CP propellers operating behind model hulls. 
The initial experiments were conducted on a single-screw ship, namely, a 
model of the FF-1088. These results were reported winreriomoliy The sec- 
ond set of experiments were conducted on a twin-screw ship, namely, a 
model of the DD-963 Class. These results are presented in the current 
report. 
For the DD-963 Class, the experimental conditions included 
(1) steady-ahead operation near the self-propulsion point, (2) steady- 
ahead operation near the self-propulsion point with forced dynamic pitch- 
ing of the model hull, and (3) simulated acceleration operation. 
Results for the steady ahead operation were correlated with predic- 
tions based on unsteady lifting surface theory as developed by Tsakonas 
et ail”? and with the quasi-steady method of WeCercttinnn@° and with strains 
measured on the full-scale propeller. 
Blade loading measurements were made on the propeller on the star- 
board shaft since this shaft had a larger rake angle than the port shaft. 
The propellers used in these experiments were DINSRDC propellers 4660 
(right hand rotation on port shaft) and 4661 (left hand rotation on star- 
board shaft), which were made of aluminum; see Figure 2 and Table 1.** 
The hull of the DD-963 Class was represented by DINSRDC model hull 
5265-1B; see Figure 3. 
*Figures are presented following the section on acknowledgments. 
**kThe tables are presented following the figures. 
2 ecikones, S. et al, "An Exact Linear Lifting Surface Theory for 
Marine Propeller in a Nonuniform Flow Field," Journal of Ship Research, 
Vol. 17, No. 4, pp 196-207 (December 1974). 
6 
AO eve tee. J.H., "On the Calculation of Thrust and Torque Fluctuations 
of Propellers in Nonuniform Wake Flow," David Taylor Model Basin Report 
1533 (October 1961). 
