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 is the seafaring term for the left side of the boat or ship, from the point of view of a person aboard the ship, facing the front, or bow. This term is also used for spacecraft and airplanes. The port side of a ship does not change depending on which way a person is facing. The opposite is starboard. The original English nautical term for the left side of a ship was larboard, which came from the Middle English term for the loading side..