• Design newship dimension base on mothership:

Item Unit Content& Value

Boundary Condition

Ship Type - Container 1,650 TEU

LBP M 162 [1team] Fixed Length, Vs = 19.5 knots

B M 27 [2 team] Fixed Breadth (Crane reach), Vs = 21 knots

Tor d M 8.7 [3 team] Fixed Draft (Habor), Vs= 21 knots

Dispt. M3 25.115 Displacement is constant.

vs knots 20.5

Known:dwt, B and CD

Unknown: L, H, Cb

L = B * 6.25 = 168.75

D = B / 1.7 = 15.88

T = D * 0.62 = 9.85

L = 168.75

T = 9.85

B = 27

The lenght and draft were both increased weight of ship is also increasing.

Item Unit Content& Value

Boundary Condition

Ship Type

- Container 1,650 TEU

LBP M 162 [1team] Fixed Length, Vs = 19.5 knots

B M 27 [2 team] Fixed Breadth (Crane reach), Vs =21 knots

Tor d M 8.7 [3 team] Fixed Draft (Habor), Vs= 21 knots

Dispt. M3 25.115 Displacement is constant.

vs knots 20.5

L = 162 mL = Various

Fix Lenght from mother ship L= 162

Disp' 25.115

B = 27.0

Cb = H = L/B B/H

Cb of Mother ship 0.660 8.7

6.0

3.10

Case 1 0.652 8.8 3.07

Case 2 0.645 8.9 3.03

Case 3 0.638 9.0 3.00

Case 4 0.631 9.1 2.97

Case 5 0.624 9.2 2.93

Block coefficient

Suitable values of Cb Suitable values of Cb ( limitation )

Decrease 3.5% to mother ship operate at 21 kn, Increase 2.5% to mother ship operate at 20.5 kn

L = 162 mL = Various

L = (B – 10) * 10 = 170

Known:dwt, B and CD

Unknown: L, H, Cb

Cb 0.573H 8.7 9.1 9.6 9.8 10 10.2

Disp 22888.9 23941.3 25256.7 25782.9 26309.1 26835.3

There’re 4 suitable case above, but what is the best choice?

Cb 0.573H 8.7 9.1 9.6 9.8 10 10.2

Disp 22889.0 23941.3 25256.8 25783.0 26309.1 26835.3LWT*1.3 9006.5 9159.2 9344.3 9416.6 9488.1 9558.6

Disp - LWT 13882.4 14782.1 15912.5 16366.3 16821.1 17276.7DWT 15069.0

How can we choice the bestest one?

Method 1 Method 2New ship 1 New ship 2 New ship 3

L 168.75 162 170B 27T 9.85 10.2 9.6

Cb 0.589 0.563 0.573Disp 26431.5 25.115 25256.8

Method 1 Method 2New ship 1 New ship 2 New ship 3

L 168.75 162 170B 27T 9.85 10.2 9.6

Cb 0.589 0.563 0.573Disp 26431.5 25.115 25256.8

Disp - LWT 17119.6 16333.8 15912.4

DWT 15069.0

Ship 1 and ship 3 has the lenght bigger than ship 2 higher building cost - due with longitudinal streght.Ship 2 is the best choice!