UNCLASSIFIED 
LULCURITY CLASSIFICATION OF THIS PAGE(When Data Entered) 
measured components of blade loading is primarily a once-per-revolution 
| variation, with the variation following approximately the variation of the 
tangential 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 cir- 
cumferential variation of measured forces and moments increased by approxi- 
mately 50 percent 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. 
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SECURITY CLASSIFICATION OF THIS PAGE(When Data Entered) 
