3. The amplitude of the first harmonic of all loading components 
varied essentially as nV. 
4. The acceleration of the hull did not have a significant effect 
on the loads; i.e., the loads for quasi-steady acceleration V=0 and un- 
steady acceleration v>0 were not significantly different. 
The ratics of either the peak or time-average loads during the accelera- 
tion (or crash-forward) maneuver to the time-average loads at the self- 
propulsion point do not agree closely for the results in the present 
report (DD-963 Class) and Reference 2 (FF-1088). This difference is to 
be expected since these ratios are very sensitive to the value of V, n, 
and P for the simulated maneuvers, which are quite different for these 
two cases. The largest moment component for both cases ae gives 
/M = 1.40 from the present report and 1.51 from Reference 2. The 
Ypeak Ygp 
results from the present report show M /M = 1.21 whereas the results 
y. My, 
a i MAx ‘sp 
from Reference 2 yield M /M SValsos 
Ymax Ysp 
CORRELATION WITH FULL-SCALE DATA AND THEORY 
For operation near the self-propulsion point (Condition 1 in Table 
3), correlation was made between the model experimental loads obtained in 
the present investigation, bending moments deduced from strains measured 
on the corresponding full-scale propeller, and analytical calculations. 
These comparisons were made for My 3 and Moo 4 which were calculated 
from the three measured forces and three measured moments. As discussed 
in the section on experimental results, My .3 is defined as the bending 
Moment applied on the spindle axis about the axis intersecting the spindle 
axis at r=0.3R and parallel to the expanded pitch line at r=0.3R. The 
My 3 vector as defined by the conventional right-hand rule for a right- 
hand propeller (left-hand rule for a left-hand propeller) intersects the 
plane normal to the propeller axis at the angle 9 3 = tan "(Py 4/(0.3nD)) 
and is directed so that a positive M 3 puts the face (pressure side) of 
0 
the blade in tension. The component M is defined in a manner analogous 
0.4 
to My 3 except it, is referred to r=0.4R. 
42 
