Ship Resistance Predeiction-pe

Ship Resistance prediction method By Oadokun Sulaiman

LOA LBP B D T DISPLACEMENT WSA Cb Cm Cp LCF

26 m 21.5 m 5.48 m 2.51 m 2.104 m 107.9 tonnes 125.227 0.445 0.759 0.694 0.832

LCB

Aft of amidships

0.818

Speed

Aft of amidships

12.00 Knot 5.00 Knot

Speed

Free running

6.17

Trawling

2.57

4.74 2.60 1.21

L/B= B/T= V/SQR(L)=

F1= F2= F3= F6= Ct=

Fm graph7.4 Fm graph7.4 Fm graph7.8 100a(Cm-0.875) F1+F2+F3+F6

2.5 0.17 -2.3 0 0.37

L

V^2/LX V

3.76 m

SFC RO Vol DISP S

49.05 (/1000(152.5XSFC)+ 7.59 Cpx LCT 133.40 (3.4XVol disp+.5XC3 60756.80

Total resistance Rt=

(CtxDISP*V(SQR))/L 227424.28 KG

Required horsepower Installed horsepower

CtXDISPXVt^3))/(325

a@V/SQR(L) From table

0.68 1.37 (Assumes 50% efficiency)

Speed converter Desired Speed (Knots) Speed (metres/sec.) Speed (kts) to 1.85 power Displacement, Kg. Wetted length, metres Waterline beam, metres Deadrise angle, degrees Planing angle, degrees Wavemaking resistance (Kg.) Skin friction resistance (Kg.) Total resistance, Kg. Total resistance, Newtons Required horsepower Installed horsepower S/L ratio:

12.00 6.17 99.19 107.90 125.23 2.51 0.00 0.45 0.85 1979.84 1980.69 19430.60 160.65 321.31 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

[Enter]

[Enter] [Enter] [Enter] [Enter]

(Assumes 50% efficiency)

m/s knt

0.031

r Speed (mph) Speed (knots)

12.00 [Enter] 10.42

Speed (knots) Speed (mph)

15.00 [Enter] 17.27

Feet and inches to metres Feet 18 [Enter] plus inches 6 [Enter] Metres 5.639