9 10 11 12 13 1* 15 16 17 18 19 20 

 SPEED IN KirOTS 

 Figure 92 — Comparison of EHP obtained by testing a Model of an 

 Ocean-going Ore Carrier with Corresponding Estimate from 

 Series 60 Contours using SS PENNSYLVANIA as 

 Basic Ship 



discrepancies." This suggestion was taken up by the SNAME Panel (of which Mr. Russo 

 was a member), and the subsequent Series 60 parents were developed using just this method^ 

 as described earlier in this report. It is believed that these parents now compare very well 

 in performance with the successful ship designs on which they were based. 



Comparisons with results of similar work at the Netherlands tank have already been 

 mentioned in Chapter VI, and in this connection, it is of interest to quote the remarks of 

 Professor L. Troost, one-time Director of that establishment, with a vast experience in the 

 model testing field: "The writer has applied the computations as presented in the paper to 

 the results of some high-quality hulls and propellers of foreign (European) design, ^e is 

 satisfied that the optimum Series 60 data are indicative of very high performance and that 

 it will require great skill and experience to improve on them for an amount of 2 percent in 

 total ehp and shp in regular designs. He also found that an extrapolation to 0.82 block, 

 which will often be necessary in the field of super-tankers and comparable ships, not too 

 hazardous." (Discussion on Reference 64). 



XII-10 



