What size and dimensions for boat fenders?
The main criteria on choosing the shape of the fenders, rather cylindrical, round or flat ones is determined by the shape of the haull, the lenght of the ship, its weight and the height of the freeboard.
The shape of the haull :
The boat fenders attached to each side are, in pinciple, all of the same type and same size. They can be completed by larger boat fenders in the front and/or in the back of the ship, depending on the haull's design.
The freeboard :
The fender height must be at least 2/3 of the freeboard height of the boat..
The lenght and the weight:
You can find below a table with the diameter of fenders depending on the lenght of a ship.