C + P — P ' 



F ship "^ ^ F model ^ F model 



(ITTC) (ATTC) (ITTC) 



or 0.001950 + 0.003415 - 0.003490 



or 0.001950 - 0.000075 



or 0.001875 



Entering Figure El with this value for (C'pg + 0.0004) and a speed of 14.973 knots, the 



value of — !1 is 1.197, whence Rp = 1.197 x 39994 = 47873 lb. Hence R j. = R f^ + R p 



S 

 = 23020 + 47873 = 70893 lb 



70893 X 14.973 



Then ehp = 



325.6 



= 3260 



The corresponding ehp using the ATTC line is 3330 (Table D3), so that using the ITTC line 



gives about 2 percent less ehp in this particular case. 



D-15 



