Jacket and case manufacture. 1  3 The jackets of the 8-inch and 5 1/4-inch disks are cut out of polyvinyl chloride (PVC) stock to appropriate size, and the fabric liners laminated to them. 2  4 The case or shell of 3 1/2-inch disks is molded out of hard plastic.
Aft: generally anything astern of the z-axis mid-line of a vessel; diminutive of the word after. Bow: the forward section (or fore) of a ship. Stern: the rear section (or aft) of a ship. Port (side): the left side of a ship from the perspective of a person standing on board and facing the bow of the ship on the bridge. Starboard: the right side of a ship from the perspective of a person standing on board and facing the bow of the ship on the bridge.
When looking forward, toward the. of a ship, port and starboard refer to the left and right sides, respectively. In the early days of boating, before ships had rudders on their centerlines, boats were controlled using a steering oar.Most sailors were right handed, so the steering oar was placed over or through the right side of the. .Sailors began calling the right side the steering side, which soon became starboard by combining two Old English words: steor (stÃ©or meaning) steer and (bord meaning the side of a). boatost sailors were right handed, so the steering oar was placed over or through the right side of the. . Sailors began calling the right side the steering side, which soon became starboard by combining two Old English words: steor (stÃ©or meaning) steer and (bord meaning the side of a). boat