TABLE 3 

 Basic Statistical Data on Pitch Accelerations 



Sea 

 State 

 (Esfd) 



Significant 



Wave 



Heiglit 



ft 



Heading of 



Waves Relative 



to Sliip 



Ship 

 Speed 



knots* 



N 

 Number of 

 Variations 

 per Hour 



Minutes 

 Sampled 



(i)' 



Predicted 



Maximum 



Value for 



1-hr Operation 



Maximum Measured 



Peak-to-Peak 



Variation 



rad/sec^ 



Number of Variations 



in Sample 



from Which 



Maximum I'.'as Obtained 



Predicted 



Maximum 



Peak-to-Peak 



Variation 



Ratio 



Predicted 



Maximum to 



Measured Maximum 



2 



6 



Head 

 Seas 



10 

 14 



704 

 786 



30 

 32 



0.0015 

 0.0024 



0.099 

 0.126 



0.093 

 0.123 



352 

 419 



0.093 

 0.121 



1.00 

 0.99 



2 



6 



Quarter 

 Head 

 Seas 



10 

 14 



761 

 872 



32 

 32 



0.0015 

 0.0014 



0.100 

 0.097 



0.093 

 0.097 



406 

 465 



0.095 

 0.093 



1.02 



0.960 



2 



6 



Beam 

 Seas 



10 

 14 



708 

 740 



29 1/2 

 32 



0.0033 

 0.0033 



0.147 

 0.148 



0.144 

 0.140 



348 

 395 



0.139 

 0.140 



0.97 

 1.00 



2 



6 



■Quartet 



Following 



Seas 



14 



890 



29 



0.0016 



0.104 



0.11 



430 



0.099 



0.90 



2 



G 



Following 

 Seas 



14 



635 



32 



0.00028 



0.043 



0.047 



339 



0.0404 



0.86 



3 



7-9 



Head 

 Seas 



10 

 14 

 17 



694 

 765 

 862 



26 

 32 

 27 



0.0109 

 0.0161 

 0.0171 



0.267 

 0.327 

 0.341 



0.28 

 0.322 

 0.357 



301 

 396 

 388 



0.250 

 0.310 

 0.313 



0.90 

 0.97 

 0.90 



3 



7/9 



Quarter 

 Head 

 Seas 



10 

 17 



779 

 900 



27 1/2 

 37 



0.0022 

 0.0028 



0.121 

 0.138 



0.13 

 0.15 



357 

 555 



0.114 

 0.133 



0.88 

 0.89 



3 



7-9 



Beam 

 Seas 



10 

 17 



763 

 760 



29 

 26 



0.0030 

 0.0029 



0.142 

 0.139 



0.161 

 0.174 



369 

 329 



0.133 

 0.130 



0.83 

 0.75 



3 



7-9 



Quarter 



Following 



Seas 



17 



696 



31 



0.001 



0.081 



0.075 



338 



0.076 



1.00 



3 



7-9 



Following 

 Seas 



17 



629 



23 



0.00072 



0.068 



0.064 



241 



0.063 



0.98 



4 



16 



Head 

 Seas 



14 



780 



30 



0.0222 



0.384 



0.39 



390 



0.35 



0.90 



5 



21 



Head 

 Seas 



7 1/2 

 14 



624 

 692 



•27 1/2 

 24 



0.0173 

 0.0308 



0.334 

 0.450 



0.425 

 0.47 



284 

 278 



0.341 

 0.42 



0.80 

 0.89 



5 



21 



Quarter 

 Head 

 Seas 



7 1/2 



14 



615 

 711 



38 1/2 

 28 1/2 



0.0140 

 0.0327 



0.300 

 0.465 



0.314 

 0.47 



395 

 338 



0.29 

 0.437 



0.92 

 0.93 



5 



21 



Beam 

 Seas 



7 1-2 



458 



30 



0.0039 



0.155 



0.161 



229 



0.145 



0.90 



5 



21 



Quarter 



Following 



Seas 



7 1/2 

 10 

 14 



702 

 660 

 714 



28 1/2 

 29 

 27 



0.0032 

 0.0023 

 0.0023 



0.145 

 0.123 

 0.123 



0.146 

 0.129 

 0.131 



333 

 319 

 322 



0.136 

 0.115 

 0.115 



0.93 

 0.89 

 0.88 



5 



21 



Following 

 Seas 



7 1/2 

 14 



524 

 470 



33 

 31 



0.0013 

 0.0004 



0.090 

 0.050 



0.068 

 0.058 



288 

 243 



0.085 

 0.047 



1.25 

 0.81 



•TTie speed is the nominal speed read from a calibration curve of propeller rptn versus ki.ots; 

 7 1/2, 10, 14, and 17 knots correspond to 94, 127, 185, and 230 ipra, respectively. 



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