Mediterranean Frame (skeleton) built- in northern waters mostly frame built oared galleys where the oarsman was not a slave but a warrior, 60-120 men
Clinker built - Originally Viking, the internal frame is added at the end as extre strengthening the ship is not built onto a frame but made up from the keel with overlapping planks secured to one another with iron rivets. (Henry V and the Norwegians built some of the largest wooden ships ever seen with clinker construction)
Cog - flat bottom of heavy timbers with steep clinker sides rising up and added cross beams that protruded through the sides, high free board (advantage when fighting and in heavy weather) and flat bottom meant could easily sit in the mud at low tide. Single mast up to 114ft high and 10ft circumference. Warships had "castles" built on to increase height advantage in combat.
Balinger - adaptation of Basque whale hunter, clinker built English type of oared galley - also larger barge.
Cocha - Mediterranean version of the cog but skeleton built, some very large versions came north and were there known as carracks