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Ship Resistance prediction method By Oadokun

Sulaiman

LOA 26 m

LBP 21.5 m

B 5.48 m

D 2.51 m

T 2.104 m

DISPLACEMENT 107.9 tonnes

WSA 125.227

Cb 0.445

Cm 0.759

Cp 0.694

LCF 0.832 Aft of amidships

LCB 0.818 Aft of amidships

Speed 12.00 Knot Free running 6.17

Speed 5.00 Knot Trawling 2.57

L/B= 4.74

B/T= 2.60

V/SQR(L)= 1.21

F1= Fm graph7.4 2.5

F2= Fm graph7.4 0.17

F3= Fm graph7.8 -2.3

F6= 100a(Cm-0.875) 0 a@V/SQR(L)

Ct= F1+F2+F3+F6 0.37

From table

L V^2/LX V 3.76 m

SFC 49.05

RO (/1000(152.5XSFC)+ 7.59

Vol DISP Cpx LCT 133.40

S (3.4XVol disp+.5XC3 60756.80

Total resistance Rt= (CtxDISP*V(SQR))/L 227424.28 KG

Required horsepower CtXDISPXVt^3))/(32 0.68

Installed horsepower 1.37 (Assumes 50% efficiency)

mailto:a@V/SQR(L)mailto:a@V/SQR(L)

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Speed converter

Desired Speed (Knots) 12.00 [Enter]

Speed (metres/sec.) 6.17

Speed (kts) to 1.85 power 99.19

Displacement, Kg. 107.90 [Enter]

Wetted length, metres 125.23 [Enter]

Waterline beam, metres 2.51 [Enter]

Deadrise angle, degrees 0.00 [Enter]

Planing angle, degrees 0.45

Wavemaking resistance (Kg.) 0.85

Skin friction resistance (Kg.) 1979.84

Total resistance, Kg. 1980.69

Total resistance, Newtons 19430.60

Required horsepower 160.65

Installed horsepower 321.31 (Assumes 50% efficiency)

S/L ratio: 0.59`

N.B. Formula is unreliable at S/L ratios below about 3.

To convert pounds to Kg, divide by 2.2

To convert long tons to pounds, multipy by 2,240

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m/s

knt

0.031

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Speed (mph) 12.00 [Enter]

Speed (knots) 10.42

Speed (knots) 15.00 [Enter]

Speed (mph) 17.27

Feet and inches to metres

Feet 18 [Enter]

plus inches 6 [Enter]

Metres 5.639