210 THE PROBLEM OF THE HULL AND ITS SCREW PROPELLER. 
(6) e. h. p. +E. H. P. (assumed load 
EEACTIONS) Mn MnueNn Hea tTe Cuma Seay I 2 3 (Variable) 
(7) v+V=Speed fractions at assumed 
pPoimtsson (GO) Lae MNS aaMs I 2 3 (Variable) 
(8) pO (assumed diameter) ye eee en rel D D D (Constant) 
(9) S (basic slip for hull conditions).... So) SS S (Constant) 
(10) V=v+(v+ V)=Basic speed...... I I I (Variable) 
Gn) ik Powermaugmente ae nee K K K (Constant) 
(12) Z,=Power factor for B. = 
(Hage GEA Ser rep ae hai an ene Oe I 2 3 (Variable) 
(ig) 1g El, RSs 18h, 12 XO SI = 
IBASIC(DOWET IM eccrine ore I 2 3 (Variable) 
(GRAY ia Deine Tes oS) here tur tae oN I 2 3 (Variable) 
(2.88XI. H. P.)+(D?X V) for 3-bladed propellers. 
I. T.p+(U—S)= {i249 <I. H. P.)+(D’?X V) for 4-bladed propellers. 
(3.841. H. P.)+(D?X V) for 2-bladed propellers. 
(15) P. A.+D. A.=Proj. area ratio for 
GTA PEL SEN Shih ae ewe ta ean I 2 3 (Variable) 
(15) = Projected area ratio of the propeller if 3-bladed = Basic. 
(16) 4/3 (P. A.+D. A.) =Total projected area ratio for 4-bladed. 
(17) 2/3 (P. A.+D. A.) =Total projected area ratio for 2-bladed. 
(78) PY) @.— Propulsivescock toni (15). 
GALS y MiKo} ol (Fir g) Ni beatles Yai ia a I 2 3. (Variable) 
@o) PE Ee Py Ee Pe @r—ibasic 
effective horse-power. 22... 4... I 2 3 (Variable) 
@o) eq thy ps Bae EP as<i(es i heiion— 
HV erediyts eee ain cnr noe at I 2 3 (Variable) 
(21) p. c.=Propulsive coef. expected = 
Za(20)) =i I) NOG (2) eee I D 3 (Variable) 
(22) T. S.=Tip speed for (15), Fig. 4.. I 2 3 (Variable) 
(Bayi Si — Ti (Oven enue ne (1—S) (1—5S) (1—.S) (Constant) 
(24) P=(aD X V X 101.33) + (T. S. X 
(Gites) a) DERE PRUNES Sv te ea I 2 3 (Variable) 
(25) Zs=Speed factor for Ta Fig. 6, 
CURVE fT PANU Ai U8 LC ea BUR I 2 3 (Variable) 
(2S) SS(SNCUS WE esa Gel Se al TL S< 
HOG) (Ula, aly JEN ere Sy dale Ente I 2 3 (Variable) 
C7) RE (@yeTo01e33) (RX —s) oe I 2 3 (Variable) 
If proper revolutions are not obtained, proceed as before. 
