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.
Port and Starboard. If you are standing in the rear of the boat looking forward, the entire right side of the boat is the starboard side; the entire left side is the port side. The front right side of the boat is the starboard bow; the front left is the port bow.he front end of a boat is the bow. When you move toward the bow, it is called going forward. The rear of a boat is the stern. When you move toward the stern, you are going aft. When a boat is moving, either by power or sail, it is called being underway. A boat moving forward is moving ahead.