The thickness of the plates varies with their position in the hull, the thickest or heaviest being usually found over the bottom and at the deck edges amidships .
Ubungqingqwa bezigqumi bahluka ngokwendawo esiqwini senqanawa, esona sigqumi singqingqwa kakhulu okanye esinzima kakhulu sidla ngokufumaneka ngaphazulu komphantsi kumacala ombindi wedekhi.