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'''Coolship''' (Anglicized version of the Dutch/Flemish ''koelschip'') is a type of fermentation vessel used in the production of beer. Traditionally, a ''coolship'' is a broad, open-top, flat vessel in which wort cools, and is an integral step in the process of making Belgian lambicand other [[Spontaneous_Fermentation|spontaneously fermented beers]]. The high surface to mass ratio allows for more efficient cooling. Some German brewers also still use coolships (''kühlschiff'') to partially cool wort to 55-75°C (131-167°F) before either chilling the wort in a closed system or transferring the hot wort to a fermenter to cool <ref>[http://craftybeergirls.com/2018/03/18/coolship-field-trip/ Lauren Lerch. "Coolship Field Trip". Crafty Beer Girls blog. Retrieved 03/18/2018.]</ref><ref>[http://www.uerige.de/brauerei-brauprozess.html "Malz – aus Gerste und Weizen ". Zum Uerige website. Retrieved 03/18/2018.]</ref>. Contemporary usage also includes any using a coolship as an open fermentor used in for the production of non-sour beer, even when using modern mechanical cooling techniquesvery similar to how [https://www.anchorbrewing.com/blog/brewing-insights-open-fermentation/ Anchor Brewing Co] ferments beer openly. This article will focus on the use of a coolship to initiate spontaneous fermentation and will not address the use of coolships to partially cool wort as in historically German style brewing or to conduct open fermentation.  Traditionally, ''coolships'' were constructed of wood, but later were lined with iron or copper for better thermal conductivity. See also the [http://www.milkthefunk.com/ccc/ MTF Coolship Cooling Calculator]. See [[Spontaneous_Fermentation#Cooling|Spontaneous Fermentation]] for information on dissolved oxygen in wort that is cooled overnight in a coolship.