Table 11 - Principal Particulars of 0.60 Block 

 Table 10 - Pattern of LCB Series Models Coefficient Forms 



Model numbers Model No 4215 4210 4216 4217 



Cb Position of LCB as % Lbp from S5bp i-BP. ft 400.0 400.0 400.0 400.0 



Q gg 4215 4210 4216 4217 5. ft 53.33 53.33 53.33 53.33 



2 48/4 1 50^ h\A 52F //, ft 21.33 21 .33 21.33 21 .33 



0.65.... 4231 4218 4211 4219 4220 ?' ^?°^ ^^'^ I^'' I^'' I^^ 



2.46/1 1.54/1 0.50/1 0.38F 1.37F t^r n n n n 



0.70.... 4230 4221 4212 4222 4223 V'^f*'' X r: n= ns n^ 



2.05/1 0.55^ 0.50F 1.54F 2.55F W-t-flP 0.5 0.5 0.5 0.5 



0.75... 4224 4213 4225 4226 Cb 0.60 0.60 0.60 0.60 



0.48F 1 50F 2.57F 3.46F Cx 0.977 0.977 0.977 0.977 



0.80... 4227 4228 4214 4229 Cp 0.614 0.614 0.614 0.614 



n 7fiF 1 4'if 2 50F 3 51F CvY 0.558 0,581 0.bU3 O.b^b 



" '^^ ^^^^ ^^'^ "^ °^ CpA 0.671 0.646 0.624 0.602 



Note: Column 3 of model numbers applies to Series 60 Parents. Cre . 558 . 581 . 603 . 626 



CpR 0.671 0.646 0.624 0.602 



Cpv 0.857 0.850 0.843 0.839 



CpvF 0.910 0.910 0.912 0.919 



CpvA 0.818 0.802 0.785 0.770 



Cw 0.700 0.706 0.712 0.715 



CwF 0.598 0.624 0.646 0.666 



CwA 0.802 0,788 0.777 0.765 



CiT 0.533 0.543 0.5^9 0.553 



The lines for each model were drawn Mag, deg 6.2 7.0 7.6 8.3 



LwL, ft 406.7 406.7 406.7 406.7 



out by using the contours of sectional area LCB % Lbp from S] . . 2.48^ 1.5-4 0.5M 0.52F 



^ ^ LIB 7.50 7.50 7.50 7.50 



and waterline coefficients already described. B/H 2.50 2.50 2.50 2.50 



^ L/v'^i 6.165 6.165 6.165 6.165 



The models are therefore related to one A/(L/100)» 122.0 122.0 122.0 122.0 



S/v^i. 6.478 6.481 6.504 6.527 



another by the graphical charts, and for a ws, sq ft , . ^__ 27270 27280 27380 27470 



,, . ,. . . . ,, Kr = R/VBH 0,229 0.229 0.229 0.229 



given set Of design conditions a unique hull Cp^/Cp^ 0.831 0.899 0.966 1.040 



form is determined. 



The models were made and the tests 

 carried out in exactly the same manner as 

 described for the parent models. The model 



results have been converted to apply to ships with 400-ft LBP by using the ATTC line for 



the friction extrapolation with an addition of +0.0004 for ship correlation allowance, as before. 



The ship figures are given in Tables 16 through 20 as values of Cj. to a base of 



-j=r and in Tables 21 through 25 as values of (c) to a base of (k) , all for a standard 



temperature of 59°F (15°C). 



To obtain a visual picture of the resistance results, the (C) values can be plotted as 

 cross curves to a base of LCB location, using (k) as a parameter. When this is done, it is 

 found that for the speeds within the range of economic performance for these models a locus 

 of LCB position to give minimum resistance is usually well defined. At high speeds, beyond 

 the useful range, the minimum lies in general in a region where the LCB is much further aft 

 than was used in any of these experiments. 



As might be expected, there is in general no unique relation between block coefficient 

 and optimum LCB location— it depends on what speed is chosen as the criterion for 

 comparison. Figures 26 through 30 show cross-curves of (c) to a base of LCB position for 



(Text continued on page VI-13) 



VI-3 



