With reference to the construction of a vessel, state the meaning of EACH of the following terms: (a) sheer;(2) (b) freeboard;(2) (c) moulded depth;(2) (d) moulded draft;(2) (e) flare.(2)
(a) Sheer (2 marks)
Meaning: The longitudinal upward curvature of the deck line towards the bow and stern.
Purpose/Use: Improves seakeeping and buoyancy forward and aft, helping the vessel resist green seas and reducing water shipped on deck.
(b) Freeboard (2 marks)
Meaning: The vertical distance from the waterline to the upper deck edge at side (deck line).
Purpose/Use: Ensures sufficient reserve buoyancy and compliance with the Load Line Convention.
(c) Moulded Depth (2 marks)
Meaning: The vertical distance measured from the base line (top of keel) to the underside of the deck plating at side of the uppermost continuous deck.
Purpose/Use: Defines the depth of the hull structure and is used in tonnage and stability calculations.
(d) Moulded Draft (2 marks)
Meaning: The vertical distance from the base line (top of keel) to the summer load line (waterline).
Purpose/Use: Represents the design maximum draught used for stability, load line, and classification calculations.
(e) Flare (2 marks)
Meaning: The outward curvature of the hull sides above the waterline at the bow.
Purpose/Use: Deflects seas and spray away from the foredeck, improving dryness, buoyancy, and seakeeping forward.
