Flashcards in Stablity Deck (18)
What is stability?
The tendency of a vessel to remain upright.
What is the center of gravity?
The point at which the weight of the boat acts vertically downwards.
What is buoyancy?
The upward force of the water displaced by the hull.
What is the center of buoyancy?
Is the point at which all upward vertical force is considered to act
What is equilibrium?
When the center of buoyancy is directed below the center of gravity
What is rolling?
Is the side to side motion of a boat
What is heeling?
Temporary leaning of a boat to one side caused by a change in the center of buoyancy
What is listing?
A permanent leaning of a boat to one side due to a shift in the center of gravity
What are the two types of stability?
Transverse and longitudinal
What is transverse?
Stability that tends to keep the boat from rolling over (capsizing)
What is longitudinal?
Stability that tends to balance the boat preventing it from pitching end over end. (Pitch poling)
What is moment?
The force that causes a vessel to return to an even keel or upright position.
What is righting moment?
The force causing a vessel to react against a roll and return to an even keel
What are the two forces that act on a boat?
Static and dynamic
What is static force?
Caused by the placement of weight within the hull
What is dynamic force
Caused by actions outside the hull such as wind and waves
What is free surface effect?
When a compartment of a vessel is only partially filled with liquid