Model 



Details 



Percentage Increase 

 in © with Studs 



© 400 ft with 

 Stimulation 







Service 

 Speed 



Trial 

 Speed 



Service 

 Speed 



Trial 

 Speed 



4435\V 



PENNSYLVANIA (a? built) 



11.8 



9.0 



0.715 



0.735 



4420W 



Series 57 equivalent 



10.4 



8.2 



0.735 



0.765 



44-20U-1 



PENNSVLNVNIA forebody-Series 57 

 aft body 



10.7 



7.0 



0.710 



0.730 



446SW 



Series 60 equivalent 



9.0 



7.0 



0.727 



0.760 



4 468".VA-1 



PENNSYLVANIA forebody with Series 

 60 stem profile-Series 60 stern aft 

 body 



9.0 



6.6 



0.736 



0.763 



4435WA-1 



PENNSYLVANIA with Series 60 stem 

 and stern contours 



0.3 



2.0 



0.735 



0.760 



4435\VA-2 



PENNSYLVANIA with Series 60 stern 

 and PENNSYLVANIA bow contours 



2.0 







0.730 



0.753 



4435\V.\. 



PrXNSYLVA^ilA (new casting of 

 4435V,) 



0.0 



2.8 



0.725 



0.772 



4468W-2 



Series 60 equivalent with PENNSYL- 

 VANIA stem contour 



0.8 



" 



0.747 



0.772 



For the actual Series 60 parent models, studs were used throughout and the following 

 effects were measured: 



Cg = 0.60 and 0.65 



Cg = 0.70 



Cn = 0.75 and 0.80 



Resistance unaffected 



©400 ft values increased to 3 percent 



©4 00 ft values increased to 1-2 percent 



The propulsion tests on the Series 60 parents were all carried out with models fitted 

 with studs. 



Tha LCB series were all run in the first place with studs. For comparison, 14 of the 

 22 models were also run with trip wires. 



The results for the models without stimulation and with studs were as follows: 



A-3 



