Boat Vocabulary
Terms
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- Displacement Hulls
- Move through the water by pushing the water aside and are designed to cut through the water with very little propulsion. They are also limited to slower speeds. (round-bottomed hull)
- Large cruisers and sailboats normally have a...
- displacement hull
- Planning Hulls
- Designed to rise up and glide on top of the water when enough power is supplied. These boats may operate like displacement hulls when at rest or at slow speeds but climb towards the surface of the water as they move faster. They can skim along at high speed, riding almost on top of the water rather than pushing it aside. (flat-bottomed and vee-bottomed hulls)
- Bow
- Front of a vessel
- Stern
- Rear of a vessel
- Starboard
- Right side of a vessel
- Port
- Left side of a vessel
- Hull
- Body of a vessel
- Gunwhale
- Upper edge of a vessel\'s side
- Cleat
- Metal fitting on which a boat can be fastened
- Beam
- Maximum width of a vessel
- Freeboard
- Distance from water to lowest point of the boat where water could come on board
- The equipment that a vessel must carry is dictated by it\'s...
- Length overall
- The length overall is measured from the ___ to the ___
- BOW to the STERN
- Flat Bottom Hull (type)
- Planing hull
- Flat Bottom Hull (advantages)
- Shallow draft, which is good for fishing in small lakes and rivers
- Flat Bottom Hull (disadvantages)
- Rides roughly in choppy waters
- Deep Vee Hull (type)
- Planing hull
- Deep Vee Hull (advantages)
- Gives a smoother ride than a flat bottom hull in rough water
- Deep Vee Hull (disadvantages)
- Takes more power to move at the same speed as flat bottom hulls. May roll or bank in sharp turns
- Round Bottom Hull (type)
- Displacement hull
- Round Bottom Hull (advantages)
- Moves easily through the water even at slow speeds
- Round Bottom Hull (disadvantages)
- Has a tendency to roll unless it has a deep keel or stabilizers
- Multi Hull (type)
- Displacement hull
- Multi Hull (advantages)
- Has greater stability because of its wide beam
- Multi Hull (disadvantages)
- Needs a large area when turning
- Displacement Mode
- A planing hull, when operated at very slow speeds, will cut through the water like a displacement hull
- Plowing Mode
- As speed increases, a planing hull will have a raised bow, reducing the operator\'s vision and throwing a very large wake. Avoid maintaining a speed that puts your boat in plowing mode
- Planing Mode
- When enough power is applied so that the hull glides on top of the water. Different boats reach planing mode at different speeds
- Most small power-driven vessels and some small sailboats have...
- Planning hulls
- Draft
- Depth of water needed to float a vessel
- Propeller
- Rotates and powers a boat forward or backward
- Keel
- Main centerline (backbone) of a vessel or the extension of hull that increases stability in the water
- drag force
- Water or fluid friction applied to the boat's hull
- cathedral or tri-hull
- a vee bottom boat with side skirts that extends almost as far forward as the main hull
- tunnel hull
- uses 2 planing hulls that with a solid center that traps air. The entrapment causes an aerodynamic lift in addition to the planing lift. Similar to the ground effect that occurs in aviation. In aviation there is reduced drag from the lift in the wings.
- catamarans
- a type of multi-hulled boat with 2 hulls joined by a frame, powered by sail or engine
- pontoon
- a flat bottom boat or the floats used to support a structure on water. Can be powered by a motor. Cannot be sunk. Made out of closed cylinders/pipes, barrels, metal shaped like boxes, or concrete. Creating a raft.