Kelson
Encyclopedia
The kelson or keelson is the member which, particularly in a wooden vessel, lies parallel with its keel
Keel
In boats and ships, keel can refer to either of two parts: a structural element, or a hydrodynamic element. These parts overlap. As the laying down of the keel is the initial step in construction of a ship, in British and American shipbuilding traditions the construction is dated from this event...

 but above the transverse members such as timbers, frames or in a larger vessel, floors. It is fastened to the keel partly to impart additional longitudinal stiffness to it but principally to bind the longitudinal members (keel and hog) to the transverse members (frames and floors).

Overview

In an open boat it is often fastened to the keel and hog in such a way that it can be removed for maintenance. Again, it lies above the boat's frames or timbers as they cross the hog but in this instance, its main function is frequently to provide a means of holding down the bottom boards in such a way that they can easily be removed for maintenance. The keelson of an open boat is normally arranged to be flush with the bottom boards so as to reduce the chance of the crew's tripping over it.

In an open boat or in a larger vessel, the hog is the structural member which lies immediately above the keel
Keel
In boats and ships, keel can refer to either of two parts: a structural element, or a hydrodynamic element. These parts overlap. As the laying down of the keel is the initial step in construction of a ship, in British and American shipbuilding traditions the construction is dated from this event...

 to which it is permanently and securely fastened so that the two form one member to which the lowest strake
Strake
A strake is part of the shell of the hull of a boat or ship which, in conjunction with the other strakes, keeps the sea out and the vessel afloat...

s (the garboard strakes) are fastened.
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