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attempting to reword the James's math
Many homebrewers will construct a "mini-coolship", as seen by Devin Bell's picture. Devin has reported good results from using his makeshift ''coolship'' <ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/1110677075627172/?comment_id=1110818382279708&offset=0&total_comments=7&comment_tracking=%7B%22tn%22%3A%22R4%22%7D Conversation with Devil Bell on the results of using his coolship. 7/16/2015.]</ref>. The benefit of building one is that a ball valve can be installed near the bottom of the coolship, which will make transferring the wort easier. Another option that some people have reported trying is purchasing a large stainless steel pans from a restaurant supply store, as well as food grade plastic trays.
The third and recommended option is to use your boil kettle. At the 2015 National Homebrewer's Conference in San Diego, James Howat's presentation, ''Wild and Spontaneous Fermentation at Home'', showed that using a boil kettle as a ''coolship'' is better for replicating a large commercial ''coolship''. James showed this by figuring out the volume of the wort in cubic feet in a ''large coolship'', and the cubic feet volume of wort in a ''small coolship''. He then compared the surface area of smaller coolships the top portion of the wort that is exposed to the air for each ''coolship''. There is actually extremely more than large a significantly greater surface area to wort ratio in the ''coolshipssmaller coolship'' used (this is similar to how there is a greater surface area to wort ratio in production breweries small wooden barrels versus large wooden barrels). <ref name="Howat">[http://www.homebrewersassociation.org/how-to-brew/resources/conference-seminars/ ''Wild and Spontaneous Fermentation at Home''. Presentation by James Howat at 2015 NHC.]</ref>.
:Example of a 36 bbl coolship:
::Dimensions of the example coolship:10 ft x 10 ft x 1.5 ft.
::Wort volume = 1122 gallons = 150 cubic feet.
::Surface area of the top surface of the wort = 100 square feet.
:Example of a 10 gallon coolship:
::Diensions of the example "mini-coolship":2.5 ft x 2.5 ft x .020 ft (2.4 inches).
::Wort volume: 9.35 gallons = 1.25 cubic feet.
::Surface area of the top surface of the wort = 6.25 square feet.