Construction
The keel length of koch was about 10–25 meters (about 30–70 feet). It had 13 combination ribs, each consisting of several details . The keel was also a combination of several parts. Bulkheads divided the body into several cross-section compartments. Each compartment (cherdak) served a specific purpose. There invariably were the fore-part compartment used as the crew's quarters, the stern cabin for the captain, and the cargo hold amidships. The koch had the flat deck. A typical koch carried one square sail on each of its two masts, and, usually, two triangular sails on the bowsprit. A distinctive peculiarity of the koch was the relatively big size of its square rudder fin which compensated for the special extra-slim design of the upper part of the rudder. This type of ship had two 70 pound (32 kg) main anchors and, very often, light anchors. Naval historians think that the light anchors could have been used for mooring kochs to the edge of the ice fields.
Special Arctic design included the rounded lines of the ship's body below the water line, an additional belt of ice-floe resistant flush skin-planking (made of oak or larch) along the variable water-line, a false keel for on-ice portage (and for damage prevention from running aground in shallow waters), and the shaft-like upper part and wide lower part (below water-line) of the rudder. Another Arctic feature was the invariable presence aboard any koch of two or more iceboats and of a windlass with anchor rope. Each iceboat had the cargo capacity of 1.5 to 2.0 metric tons (3,300 to 4,400 lb) and was equipped with long runners (5 to 7 m/16 to 23 ft) for portage on ice. If a koch became trapped in the ice, its rounded bodylines below the water-line would allow for the ship, squeezed by the ice-fields, to be pushed up out of the water and onto the ice with no damage to the body.
Besides the anti-icebound equipment, the captains of kochs had the traditional set of navigation instruments, including a sundial and a magnetic compass with floating vetromet ("wind-marker", a wooden 32-point compass rose with 16 major winds). Other tools and means of navigation were the detailed charts and sailing directions, the stars, and the pilot's marks on the familiar shores.
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