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Old 04-14-2009, 03:13 AM   #1
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Default Final Gravity Question

i'm intrigued by the imperial stout category. i am working up a recipe on brewsmith and notice that the FG is estimated to be about 1.027. what exactly makes one beer have a higher final gravity than others? i'm just used to seeing beers with an FG of 1.012 or so.

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Old 04-14-2009, 03:15 AM   #2
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Starting gravity
Mash temp
Grain bill
Yeast
Aeration
Pitch rate

to name a few.
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Old 04-14-2009, 03:28 AM   #3
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with an imperial stout i'm guessing the starting gravity plays a major role?

mash temp or yeast don't seem to affect beersmith's estimates, but i guess you mean that if you don't have a proper pitch rate or aeration, the yeast will not be as effective as it would in a perfect environment.
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Old 04-14-2009, 03:30 AM   #4
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there is soooooooo much that affects gravity. Stouts are usually going to have a higher FG than lighter ales- mostly due to the grain bill (ie., different grains have different degrees of fermentable sugars that you can convert out of them - some have little to no fermentable sugars which means you will have a higher FG from including them).
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Old 04-14-2009, 03:35 AM   #5
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Different yeast strains, attenuate differently... yeast strain WILL affect attenuation.

The HIGH OG of any Imperial, is a major contributr to the high FG.
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Old 04-14-2009, 04:05 AM   #6
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right on, thanks fellas.


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