How much is too much?

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Islandboy85

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This may be in the wrong place, so if it is, sorry. I am trying to find if there is a general rule of thumb for how much head space you leave in a connicle fermenter so you don't end up with a mess.
I want to build my own for doing 5, 6, and 10 gallon size final batches, so I am trying to figure out which hopper size I should buy. It seems as though most people I know locally leave about 30% head space in their fermenter, but I wasn't sure if I could get away with less.

https://www.homebrewtalk.com/f51/diy-conical-fermenter-14855/
http://www.toledometalspinning.com/products/hoppers/priceList.asp
 

SporkD2

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it really depends on the beer recipe, yeast, and temp your fermenting at. I usually leave 1g of headspace and on most beers its ok
 
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Islandboy85

Islandboy85

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Thanks guys. I guess I have another question then. Does the shape of the fermenter ie. larger diameter or tall and slender hopper affect how your fermentation will take place in your conicle?
 
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