TABLE 4 

 Basic Statistical Data on Roll Angles 



Sea 

 State 

 (Esfd) 



Significant 

 Wave 

 Height 



ft 



Heading of 



Waves Relative 



to Ship 



Ship 

 Speed 



knots* 



N 

 Number of 

 Variations 

 per Hour 



Minutes 

 Sampled 



E 

 deg2 



Predicted 



Maximum 



Value for 



1-hr Operation 



Maximum 



Measured 



Peal(-to-Peak 



Variation 



deg 



Number of Variations 



in Sample 



from Which 

 Maximum Was Obtained 



Predicted 



Maximum 



Peak-to-Peak 



Variation 



Ratio 



Predicted 



Maximum to 



■leasured Maximum 



2 



6 



Head 

 Seas 



10 

 14 



380 

 362 



30 

 32 



19.0 

 18.3 



10.7 

 10.4 



9.4 

 10.5 



190 

 193 



9.96 

 9.80 



1.06 

 0.93 



2 



6 



Quaiter 

 Head 

 Seas 



10 

 14 



355 

 340 



37 

 32 



31.0 

 26.0 



13.5 

 12.4 



13.1 

 12.2 



219 

 191 



12.9 

 11.7 



0.99 

 0.96 



2 



6 



Beam 

 Seas 



10 

 14 



388 

 368 



29 1/2 

 32 



17.8 

 19.0 



10.3 

 10.6 



10.6 

 10.3 



191 

 196 



9.66 

 10.0 



0.91 

 0.97 



2 



6 



Quarter 



Following 



Seas 



14 



335 



29 



24.0 



11.9 



10.9 



172 



11.1 



1.02 



2 



6 



Following 

 Seas 



14 



326 



32 



21.0 



11.0 



10.3 



174 



10.4 



1.01 



3 



7-9 



Head 

 Seas 



10 

 14 

 17 



436 

 400 

 448 



26 

 32 

 27 



20.6 

 17.5 

 9.8 



11.2 

 10.3 

 7.75 



10.6 

 9.7 

 7.2 



189 

 213 

 202 



10.4 

 9.66 

 7.23 



0.98 

 1.00 

 1.00 



3 



7-9 



Quartet 

 Head 

 Seas 



10 

 17 



209 

 339 



27 1/2 

 37 



6.5 

 7.5 



6.0 

 6.6 



6.0 

 6.7 



96 

 209 



5.45 

 6.34 



0.91 

 0.95 



3 



7-9 



Beam 

 Seas 



10 

 17 



260 

 482 



30 

 26 



6.9 

 13.0 



G.2 

 9.0 



8.7 

 9.2 



130 

 209 



5.8 

 8.35 



0.67 

 0.91 



3 



7-9 



Quarter 



Following 



Seas 



17 



285 



31 



19.3 



10.5 



10.9 



147 



9.8 



0.90 



3 



7-9 



Following 

 Seas 



17 



355 



23 



15.8 



9.6 



9.1 



136 



8.31 



0.97 



4 



16 



Head 

 Seas 



14 



348 



30 



7.8 



6.8 



6.9 



174 



6.35 



0.92 



5 



21 



Head 

 Seas 



7 1/2 

 14 



369 

 398 



27 1/2 

 24 



119. 

 84.8 



26.6 

 22.5 



24.4 

 20.6 



168 

 160 



24.7 

 20.7 



1.01 

 1.01 



5 



21 



Quarter 

 Head 

 Seas 



7 1/2 

 14 



388 

 408 



38 1/2 

 28 1/2 



75.3 

 64.3 



21.2 

 19.8 



18.1 

 23.0 



249 

 194 



21.0 

 18.4 



1.16 

 0.80 



5 



21 



Beam 

 Seas 



7 1/2 



364 



30 



171. 



31.8 



25.0 



182 



29.9 



0.84 



5 



21 



Quarter 



Following 



Seas 



7 1/2 

 10 

 14 



384 

 372 

 360 



28 1/2 

 29 

 27 



176. 

 148. 

 114. 



32.4 

 29.6 

 25.9 



38.8 

 24.0 

 21.9 



182 

 180 

 162 



30.2 

 27.8 

 24.1 



0.78 

 1.15 

 1.10 



5 



21 



Following 

 Seas 



7 1/2 

 14 



356 

 340 



33 

 31 



150. 

 60. 



29.6 

 18.8 



24.4 

 18.5 



196 

 176 



28.1 

 17.6 



1.15 

 0.95 



• Tile speed is the nominal speed read from a calibration curve of propeller rpm versus knots; 

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



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