Hulk (medieval ship type)
Encyclopedia
A hulk was a type of medieval sea craft, a technological predecessor of the carrack
Carrack
A carrack or nau was a three- or four-masted sailing ship developed in 15th century Western Europe for use in the Atlantic Ocean. It had a high rounded stern with large aftcastle, forecastle and bowsprit at the stem. It was first used by the Portuguese , and later by the Spanish, to explore and...

 and caravel
Caravel
A caravel is a small, highly maneuverable sailing ship developed in the 15th century by the Portuguese to explore along the West African coast and into the Atlantic Ocean. The lateen sails gave her speed and the capacity for sailing to windward...

. The hulk appears to have remained a relatively minor type of ship apparently peculiar to the low countries of Europe where it was probably used primarily as a river or canal boat, with limited potential for coastal cruising. The name hulk may come from the Greek word holkas, meaning a towed boat, which would be consistent with the use of the hulk as a river barge. The word hulk also has a medieval meaning of "hollowed-out" or "husk-like" which is also apposite for the shape of the basic hulk. In the fourteenth century the hulk began to develop until it was able to rival the cog as a major load carrier in the medieval economy. Whether this was a consequence of a perception of the cog's shortcomings or a result of a shift in the economic geography of Northern Europe towards the Dutch low countries is not easy to discern.

The weakest part of an enlarged hulk would be its stem
Stem (ship)
The stem is the very most forward part of a boat or ship's bow and is an extension of the keel itself and curves up to the wale of the boat. The stem is more often found on wooden boats or ships, but not exclusively...

 and stern
Stern
The stern is the rear or aft-most part of a ship or boat, technically defined as the area built up over the sternpost, extending upwards from the counter rail to the taffrail. The stern lies opposite of the bow, the foremost part of a ship. Originally, the term only referred to the aft port section...

. Since it has no proper keel or substantial stem or stern posts those parts of the boat would have to be reinforced by the introduction of substantial apron
Apron (disambiguation)
An apron is an article of clothing.Apron may also refer to:*Apron , a raised section of ornamental stonework below a window ledge, stone tablet or monument...

s and breasthooks, perhaps augmented by sacrificial stem and stern posts between which the unsupported hull planking could be sandwiched. Early hulks, like all of the other northern boat types, were initially shell-built using lapstrake or clinker
Clinker (boat building)
Clinker building is a method of constructing hulls of boats and ships by fixing wooden planks and, in the early nineteenth century, iron plates to each other so that the planks overlap along their edges. The overlapping joint is called a land. In any but a very small boat, the individual planks...

 planking which was subsequently reinforced by the insertion of grown crooks of timber as frames. Using these techniques, perhaps better understood as a result of technological transfers from architectural woodworking, shipwrights
Shipbuilding
Shipbuilding is the construction of ships and floating vessels. It normally takes place in a specialized facility known as a shipyard. Shipbuilders, also called shipwrights, follow a specialized occupation that traces its roots to before recorded history.Shipbuilding and ship repairs, both...

were able to extend the hulk in size until it rivaled and surpassed the cog.
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