All the contours show only the portion covered by the range of model tests. The 



tests wore not conducted to as high a speed range for models of higher block coefficients, as 

 for those of lower block coefficient. Hence the contours at higher —=■ values cover only 

 the lower block coefficient range. 



The contours of (C), thrust deduction t, and wake fraction w, were obtained in the same 



^« ^ 



manner as those of -— except that the original 15 points were taken at constant (k) and 



constant ship speed, respectively. 



All the computation work was done by the Applied Mathematics Laboratory on a UNIVAC 

 computer; this not only saved a great deal of time and money but also greatly reduced the 

 chance of errors. The choice of the interpolation equations was somewhat arbitrary, but the 

 comparison made in Figure C3 suggests that they do give a very good presentation of the 

 data. However, the original results are all included in Appendix B and may be used to carry 

 out any other form of plotting or interpolation desired. 



C-5 



