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A crack has appeared below the mainmast

sailing ship structureparts of a wooden shipship keel and framesstanding and running rigging
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Mast

Masts and rigging transfer sail loads into the hull.

Deck

Deck beams help the hull resist transverse deformation.

Keel

The main longitudinal member forms the structural baseline of many wooden sailing ships.

Sailing-ship structure · Select a marker for intelligence
SCENE · 01

The keel carried a line through the ship; the frames gave it volume

The keel ran lengthwise near the bottom and provided a principal reference for building. Frames rose from it across the hull like ribs, establishing breadth, curvature and the shape that would displace water.

Neither element worked alone. Floors, beams and internal timbers connected the transverse and longitudinal structure. Loads from sea, ballast, cargo and rig moved through this joined skeleton rather than stopping at the first piece of wood.

SCENE · 02

Planking kept water out while decks kept the hull from opening

Outer planks covered the frames and were caulked at their seams. They had to resist water pressure and impact while bending into the hull’s form. A leak might begin at one seam, but working of the whole structure could decide whether it stayed small.

Deck beams and planking created working levels and helped brace the sides of the hull. Openings for hatches, masts and guns interrupted that continuity and needed their own support. What appeared to be floor space was also part of the ship’s strength.

SCENE · 03

Above deck, the rig turned wind into forces the hull had to carry

Masts, yards and sails gathered wind; standing rigging held the masts in place, while running rigging moved sails and spars. Every useful pull eventually entered mast steps, chain plates, deck and hull.

That is why a sailing ship is best read as a connected load path. Shortening sail protected more than canvas. Securing cargo protected more than the hold. Carpenter, boatswain and sail handlers worked on different parts of one structure that the sea tested all at once.

Questions

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Is the keel the same as ballast?

No. The keel is a principal structural member. Ballast is weight carried or built low in the vessel to adjust stability, draft and trim; the two may be closely arranged but serve different definitions.

What is the difference between standing and running rigging?

Standing rigging chiefly supports masts and is not continually adjusted in ordinary sail handling. Running rigging raises, lowers, turns and trims sails and spars.

Were wooden hulls completely watertight?

They were built and caulked to limit leakage, but seams worked and damage occurred. Inspection, pumping and repair were normal parts of keeping a wooden vessel afloat.

Sources

Continue the research

  1. Ship plans collectionRoyal Museums Greenwich
  2. Military shipbuildingMuseo Naval de Madrid