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Old 11-19-2009, 06:01 PM   #1
lyacovett
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Default ABV question

I brewed a stout a few weeks back, and am getting ready to bottle. The FG ended up a few points higher than expected, (1.026 instead of 1.020) ... not a big deal, but I was wondering about boosting the ABV on part of the batch.

I was thinking about bottling half normally, then on the second half adding some whiskey to it. How will this affect the ABV? Would I take a normal SG reading, and will that tell mw, or there something more to calculating the ABV in this case?

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Old 11-19-2009, 06:04 PM   #2
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there is for sure a way to calculate the new ABV. but i don't know it. taking an SG reading as normal will do the trick.

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Old 11-19-2009, 06:27 PM   #3
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Are you sure it's finished fermenting?
I'm not sure why you'd want to add whiskey to boost the ABV.
Are you adding it purely for the alcohol or for some other reason.

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Old 11-19-2009, 06:28 PM   #4
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If you are still at 1.026 why the heck are you even contemplating bottling it? It is more than likely not done...and could possibly lead to bottle bombs.

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Old 11-19-2009, 06:45 PM   #5
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I am fairly certain it's done fermenting, its been fermenting for 3 weeks, 2 of which has been at 1.026 .... I don't think it dropping any more. I have also repitched yeast, which really didn't do anything.

This had an expected FG 1.020, and I mashed it too high at 158 ... so i am chalking up the higher fg to my mash temps.

I was thinking about adding some whiskey to this anyway ... but wasn't 100% sure, but I think it would turn out pretty good.

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Old 11-19-2009, 07:07 PM   #6
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Lets say you have X ml of beer at A% ABV and Y ml of whiskey at B% ABV

If you add them together, you have (X*A% + Y*B%) ml of alcohol and X + Y ml of total liquid.

The rest is left as an exercise to the reader.

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Old 11-19-2009, 07:42 PM   #7
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Quote:
Originally Posted by remilard View Post
Lets say you have X ml of beer at A% ABV and Y ml of whiskey at B% ABV

If you add them together, you have (X*A% + Y*B%) ml of alcohol and X + Y ml of total liquid.
Huh ... well that makes sense, not sure why I didn't see it that way before.
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Old 11-19-2009, 10:30 PM   #8
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Let me tell you a story about a stout I made and bottled at 1.026.

It ended with WAH-BANG! and two cases of busted stout bottles, and a huge mess of glass shards after a few weeks in the bottle.

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Old 11-19-2009, 11:06 PM   #9
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It's been in primary for 3+ weeks, and been at 1.026 for 2 weeks ... I don't think it will drop any more

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Old 11-19-2009, 11:52 PM   #10
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OK, I was getting ready to bottle tonight ... but I started to think ....

Do you really think it's too soon? I know the SG is high, but it has been for 2 weeks. How much longer should I wait to see if it drops any more? The OG was 1.064 .. it hit 1.030 in 2-4 days, then 2 or 3 days later, 1.026 .... and it's still there.

Should I go ahead and bottle, or hold off?

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