Given the condition and dimensions as below:



1) Length of ship: 33m
2) Weight of ship: 160 tonnes
3) Using only excavator to tow the ship up.
4) For high and dry docking
5) D=1.8m (5.90ft)
6) Working pressure=0.11MPa (15.95 psi)
7) Working height= 0.9m(2.952 ft)
8) Guaranteed bearing capacity per unit length = 155.59kN/m

What is the number of airbag needed? And any more information needed for calculating this situation? Thanks.