Marine airbag is an inflatable rubber product to assist ships in launching and landing. It is in a long cylindrical shape as a whole. When it helps to launch, the inflated air bag is placed at the bottom of the ship, dragging the ship with the air bag rolling, greatly reducing the friction force; when airbags used for landing, place the air bag that is not full of air at the bottom of the ship and continue to inflate, and lift the ship up to the pier with buoyancy.
So how should we choose the exact size of the marine airbag?
The shape of the mairne airbag is a combination of cone + cylinder + cone, in which the length of the cylinder part is the effective length and is in contact with the bottom of the ship. There are three main arrangement modes, as below shown: