Unit 1: Before Getting Underway Flashcards
Vessel
A ship, pleasure craft, or non-pleasure craft capable of being used as a means of transportation on water
Pleasure Craft
A vessel that is used only for pleasure or recreational activities, such as fishing or water sports, and does not carry paid passengers
Non-Pleasure Craft
A small commercial vessel that carries goods or passengers (people who have paid a fee to be transported), a workboat, a commercial fishing vessel, etc.
Boat:
A pleasure craft
Power-Driven Vessel
Any vessel that is propelled by a motor or machinery
Sailing Vessel
Any vessel that is propelled only by wind in its sails and not by a motor or machinery
Operate
To control the speed and course of a pleasure craft
Operator
The person in control of the speed and course of a pleasure craft
Design Waterline
The waterline when a pleasure craft is at its maximum recommended gross load capacity
bow
Front of a vessel
cleat
Metal fitting on which a rope can be fastened
gunwale
Upper edge of vessel’s side (generally pronounced “gunnel”)
hull
Body of a vessel
port
Left side of a vessel
propeller
Rotates and powers a boat forward or backward
starboard
Right side of a vessel
stern
Rear of a vessel
Beam:
Maximum width of a boat
Freeboard
Distance from water to lowest point of the boat where water could come on board
Draft:
Depth of water needed to float a boat or PWC
Keel:
Main centreline (backbone) of a boat or the extension of hull that increases stability in the water
Two types of boat hulls
Displacement
Planning
Displacement Hull Elaborated
Boats with displacement hulls move through the water by pushing the water aside and are designed to cut through the water with very little propulsion.
If you lower a boat into the water, some of the water moves out of the way to adjust for the boat. If you could weigh that displaced water, you would find it equals the weight of the boat. That weight is the boat’s displacement.
Boats with displacement hulls are limited to slower speeds.
A round-bottomed hull shape acts as a displacement hull. Most large cruisers and most sailboats have displacement hulls, allowing them to travel more smoothly through the water.
Planning Hull Elaborated
Boats with planing hulls are 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 toward the surface of the water as they move faster.
Boats with planing hulls can skim along at high speed, riding almost on top of the water rather than pushing it aside.
Flat-bottomed and vee-bottomed hull shapes act as planing hulls. Most small power-driven boats, including personal watercraft (PWCs), and some small sailboats have planing hulls, allowing them to travel more rapidly across the water.