buttock lines - Planes in a fore-and-aft direction, showing the outline of vertical fore-and-aft sections in the after-body.
by the board - To fall overboard; as when a mast breaks short off at the deck.
Buttock:
The breadth of a ship where the hull rounds down to the stern ...
The buttocks lines show the hull's shape at several vertical sections and reveal how full the underbody is.
The midships section shows the shape as though the hull were cut across amidships, from port to starboard.
On the body plan appear the forms of the various cross sections, the curvature of the deck lines at the side, and the projections, as straight lines of the water lines, the bow and buttock lines, and the diagonal lines.
The forward chine is all about designing a hull shape that will get up on a plane quickly The aft chine is all about stability and flat buttocks, again to help with planing speeds.
Chines will not work on just any boat.
BUTT Buttock. Used for developing the lines of a boat. Used only for lofting the lines to full size; not required when patterns are supplied.
C Top
CAMBER Athwartship curve of the vessel's deck or cabin top. Curve.
COUNTER That part of a vessel between the bottom of her stern and the wing transom and buttock. COURSE The direction in which a boat is steered. CRANK A vessel is crank when inclined to lean over, so that she cannot carry much sail.
 See also: Boat, Sail, Rudder, Forward, Aft
  
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