I.T.U Faculty of Naval Architecture and Ocean Engineering

Shipbuilding and Ocean Engineering

SHIP THEORY
PROJECT 4: LAUNCHING CALCULATIONS
Prof.Dr. Hakan AKYILDIZ

SHIP’s :

LENGTH :

BEAM :

DEPTH :

STUDENT’S :

NAME :

FACULTY NO :

PROJECT 4: LAUNCHING CALCULATIONS

 Slope of the sliding ways, tan = 1/12

Distance of the aft perpendicular from the water level, p=0 m.

Length of the sliding ways, Lsw = 0.8*L

Wetted graund ways,  = 0.1*L

Total weight, WT = 0.7 *?LWL

Total breadth of the sliding ways, b = 0.3*B

Note that the waterlines at various distances from the aft perpendicular down the ways on the profile of the ship, si=p+i , i=0,2,4,6,8,10

Then, read off the immersed sectional areas from the bon-jean curves and calculate the buoyancy and its longitudinal center using the Table 1.

Static calculations can be carried out by using the Table 2.

Pressure calculations can be carried out by using the Table 3.

Dynamic calculations can be carried out by using the Table 4.

Table 1. Calculations of the buoyancy and its longitudinal center

SECTION 2 :

Section / Area / SM / Product / MA / Product
0 / 1/2 / 0
1/2 / 2 / 1/2
1 / 3/2 / 1
2 / 4 / 2
3 / 2 / 3
4 / 4 / 4
5 / 2 / 5
6 / 4 / 6
7 / 2 / 7
8 / 4 / 8
9 / 3/2 / 9
9 1/2 / 2 / 9 1/2
10 / 1/2 / 10
1= / 2=

SECTION 4 :

SECTION 6 :

SECTION 8 :

SECTION 10 :

Table 2. Static Calculations

Section No(i) / 0 / 2 / 4 / 6 / 8 / 10
si=p+im
WT (ton)
+i (ton)
MWP (tm)
MBP (tm)
MWT (tm)
MBT (tm)
MTipp= MBT- MWT

Table 3. Pressure Calculations

Section No(i) / 0 / 2 / 4 / 6 / 8 / 10
si=p+im
WT (t)
b (m)
FB (t)
a (m)
qFP (t/m2)
qAP (t/m2)

Table 4. Dynamic Calculations

Section No(i) / 0 / 2 / 4 / 6 / 8 / 10
si=p+im
WT (t)
i (t)
WT - i
a (m/s2)
v (m/s)
t (s)