<P> On boats and ships , keel can refer to either of two parts : a structural element that sometimes resembles a fin and protrudes below a boat along the central line , or a hydrodynamic element . These parts overlap . As the laying down of the keel is the initial step in the construction of a ship , in British and American shipbuilding traditions the construction is dated from this event . Only the ship 's launching is considered more significant in its creation . </P>
<P> On boats and ships , keel can refer to either of two parts : a structural element that sometimes resembles a fin and protrudes below a boat along the central line , or a hydrodynamic element . These parts overlap . As the laying down of the keel is the initial step in the construction of a ship , in British and American shipbuilding traditions the construction is dated from this event . Only the ship 's launching is considered more significant in its creation . </P>
where is the keel located on a boat
where is the keel located on a boat
below a boat along the central line
below a boat along the central line