A piece of timber in a ship laid on the middle of the floor timbers over the keel, and binding the floor timbers to the keel; in iron vessels, a structure of plates, situated like the keelson of a timber ship.
A beam attached to the top of the floors to add strength to the keel on a wooden boat.
Timber, or line of timbers, placed over the keel on the floor timbers, and running parallel to the keel, to provide additional strength to the bottom of the hull.
An internal longitudinal timber or line of timbers, mounted atop the frames along the centerline of the keel, that provided additional longitudinal strength to the bottom of the hull.
a longitudinal beam connected to the keel of ship to strengthen it
Or kelson, a longitudinal strengthening timber(s) which rests upon the floors and is generally bolted through the floor timbers to the keel in wooden ships. In many vessels the keelson also takes the maststep. When additional timbers are laid alongside the keelson, these are termed sister keelsons; those laid atop the main keelson are termed rider keelsons. In composite, iron or steel ships, the keelson may be either a simple I beam, or flat plate keelson; or a box configuration.
A baulk of timber or a steel girder fitted on top of the floors to form the backbone of the barge; it is through-bolted to the keel, with the ends scarphed to the deadwood at stem and stern. Chine keelsons of more modest dimensions are fitted inside the frames at the junction of floors and frames.
A structural member above and parallel to the keel. Kick-up describes a rudder or centerboard that rotates back and up when an obstacle is encountered. Useful when a boat is to be beached.
the longitudinal girder which crosses the transverse floor plates and strengthens the ships bottom
laminated strips of spruce or pine that run the centerline length of the boat. The keel fin attaches through the keelson.