Table 3 - Comparison of Measured F with Other Transom-Stern 



X 



Configurations for Operation in Calm Water 

 with Hull Pitching 



MODEL HULL 



PRESENT MODEL 

 TWIN-SCREW 



SINGLE SCREW 



TWIN-SCREW 



Reference 





Boswell et al 

 (1976a, 1976b) 



Jessup et al (1977) 

 Boswell et al (1978) 



Amplitude of Pitching, i^^ (deg) 



1.33 



2.00 



1.85 



Period of Pitching T (sec) 



1.25 



1.25 



1.25 



Model speed, V^^ (m/sec) 



3.58 



3.33 



3.25 



Maximum pitching velocity of propeller, V IV^ 



0.082 



0.145* 



0.133 



<V.0.7>1'V 



0.199 



0.156 



0.123 



t<V,0 7'l+\l/<V,o.7'l 



1.41 



1.93* 



2.08 



F /F 



0.89 



0.59 



0.60 



"max.v- " 









(F - F )/F 

 "max " * 



0.72 



0.38 



0.42 



'\J 









F /(F - F 



"max.v. 'max * 



1.24 



1.55 



1.43 



[f" - (F - F )1/F 



MAX.v MAX 



0.17 



0.21 



0.18 



"mAX.i*, X 



1.03 



1.03 



1.10 



F /F 

 ^'max "'" 



1.03 



1.02 



1.05 



f" /(F - F ) - 1 



0.59 



0.59 



0.40 



"max.ij, "max " 









l<^0.7'l+VJ/(V „^), - 1 



The subscript i^ refers to operation in calm water with hull pitching, whereas absence of the subscript 

 xp refers to operation in calm water without hull pitching. 



The subscript MAX with superscript — indicates the maximum absolute value of the time-average load 

 per revolution. 



The subscript MAX with no superscript indicates the maximum absolute value of the peak load per 

 revolution. 



The subscript MAX with superscript ^ indicates the maximum absolute value of the peak minus time — 

 average load per revolution. 



* A numerical error was found in the values presented by Boswell et al (1976a, 1976b). This error has 

 been corrected in the values presented in this Table. 



50 



