Gokstad Ship - Construction

Construction

The Gokstad ship is clinker-built, constructed largely of oak. The ship was intended for warfare, trade, transportation of people and cargo. The ship is 23.24 metres (76.2 ft) long and 5.20 m (17.1 ft) wide. It is the largest in the Viking Ship Museum in Oslo. The ship was steered by a quarter rudder fastened to a large block of wood attached to the outside of the hull and supported by an extra stout rib. The block is known as the wart, and is fastened by osiers, knotted on the outside passed through both the rudder and wart to be firmly anchored in the ship. There are 16 tapered planks per side. The garboard planks are near vertical where they attach to the keel. The garboard planks are narrow and remain only slightly wider to take the turn of the bilge. The topside planks are progressively wider. Each oak plank is slightly tapered in cross section to allow it to overlap about 30mm the plank above and below in normal clinker (lapstrake) style. Iron rivets are about 180mm apart where the planks lie straight and about 125mm apart where the planks turn. At the bow all of the planks taper to butt the stem. The stem is carved from a single curved oak log to form the cutwater and has one land for each plank. The inside of the stem is hollowed into a v shape so the inside of the rivets can be reached during construction or repair. Each of the crossbeams has a ledge cut about 25mm wide and deep to take a removable section of decking. Sea chests were placed on top of the decking to use when rowing. Most likely on longer voyages sea chests were secured below decks to act as ballast when sailing. The centre section of the keel has little rocker and together with flat midships transverse section the hull shape is suited to medium to flat water sailing. When sailing downwind in strong winds and waves, directional control would be poor, so it is likely that some reefing system was used to reduce sail area. In such conditions the ship would take water aboard at an alarmimg rate if sailed at high speed.

The ship was built to carry 32 oarsmen, and the oar holes could be hatched down when the ship was under sail. It utilized a square sail of approximately 110 square metres (1,200 sq ft), which, it is estimated, could propel the ship to over 12 knots (22 km/h; 14 mph). The mast could be raised and lowered. While the ship was traveling in shallow water, the rudder could be raised very quickly by undoing the fastening. Dendrochronological dating suggests that the ship was built of timber that was felled around 890 AD. This period is the height of Norse (viking) expansion in Dublin, Ireland and Jorvik (York), England. The Gokstad ship was commissioned during the reign of Harald Fairhair at the end of the 9th century. The ship could carry a crew of 40 men but could carry a maximum of 70.

The ship's design has been demonstrated to be very seaworthy.