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Old 03-06-2009, 10:24 PM   #1
jonp9576
 
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so i made one of kahuna's recipe's. his pirate ale. so i got an abv of 5.74%

then i added a half of a handle of 21% abv rum to the beer. and ideas on how to figure out the new abv
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Old 03-06-2009, 10:48 PM   #2
jonp9576
 
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does this math make any sense?

if you figure that a handle of rum is 1/2 gallon. then half would be 1/4.

would it work this way. there are 20 quarter gallons in 5 gallons.

so if you divide 21(the % abv of the rum) by 20(to dilute it into 5 gallons)

you get .0105. so am i basically adding 1% abv to my brew going from 5.74% to 6.74%
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Old 03-06-2009, 10:51 PM   #3
SumnerH
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Quote:
Originally Posted by jonp9576 View Post
so i made one of kahuna's recipe's. his pirate ale. so i got an abv of 5.74%

then i added a half of a handle of 21% abv rum to the beer. and ideas on how to figure out the new abv
1. Are you sure the rum was 21% ABV? That's awfully low; more like 40% is typical, but we'll go with it.
2. How much beer was there? Suppose 5 gallons.

5 gallons = 18927 ml. Of that, 18927 (ml of liquid) *.0574 (your ABV) = 1086.4 ml is alcohol.
You can double-check the math: (1086.4/18927) = .0574, your ABV

1/2 handle = 875 ml. Of that, 875*.21 = 183.8 ml is alcohol

So your new total alcohol = 183.8 from rum + 1086.4 from beer = 1270.10 ml of alcohol.
Your new total volume is 18928 beer + 875 rum = 19802 ml of liquid.

1270.1/19802 = .064

So that would be 6.4% ABV in the new mix.
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Old 03-06-2009, 10:52 PM   #4
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Here's the equation i believe:

Beer Alcohol Volume (5g) x 5.74% = .287 G (you have .287 Gallons of alcohol in the beer)
Rum Alcohol Volume (.132G=500ml) x21% = .022772 G
-----------------------------------------------------
=.31472 Gallons of alcohol in the whole thing.

Divide volume of alcohol, in this example .31472 by total volume of all liquids - in my example it would be 5.132 G = 6.13%

EDIT: dammit, beat to it plus I didn't have your measurements - I was going off 500ml of rum, not 1/4 gallon....
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Old 03-06-2009, 10:57 PM   #5
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Here's what I get. (May or May not be correct)

5 Gallons @ 5.74% = .287 Gallons of Alc.
.875 L ( .231151 Gallons) @ 21% = .18375 L of Alc (or .0485416 Gallons)

5 Gallons + .231151 Gallons (Rum Volume) = 5.231151 Gallons total Volume
.287 Gallons + .0485416 Gallons = .335416 Total gallons of Alcohol

.3355416 G / 5.231151 G = 6.41%

Which is pretty close to your estimate, so they both make sense to me.

You may want to get a 2nd opinion, however.

 
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Old 03-06-2009, 10:58 PM   #6
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What the hell kind of rum is 21% (42 proof) abv?

Remind me not to buy that stuff.
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Old 03-06-2009, 11:01 PM   #7
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Quote:
Originally Posted by culaslucas View Post
Here's the equation i believe:

Beer Alcohol Volume (5g) x 5.74% = .287 G (you have .287 Gallons of alcohol in the beer)
Rum Alcohol Volume (.132G=500ml) x21% = .022772 G
Assuming a standard handle of liquor is 1.75 l:

Rum was 1/2 handle = 875 ml = .231 Gallons = .049 G of alcohol.
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Old 03-06-2009, 11:01 PM   #8
SumnerH
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Quote:
Originally Posted by gromitdj View Post
Here's what I get. (May or May not be correct)

5 Gallons @ 5.74% = .287 Gallons of Alc.
.875 L ( .231151 Gallons) @ 21% = .18375 L of Alc (or .0485416 Gallons)

5 Gallons + .231151 Gallons (Rum Volume) = 5.231151 Gallons total Volume
.287 Gallons + .0485416 Gallons = .335416 Total gallons of Alcohol

.3355416 G / 5.231151 G = 6.41%

Which is pretty close to your estimate, so they both make sense to me.

You may want to get a 2nd opinion, however.
Yep, same as mine except you converted everything to G instead of ml.
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Old 03-06-2009, 11:03 PM   #9
SumnerH
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Quote:
Originally Posted by jonp9576 View Post
does this math make any sense?

if you figure that a handle of rum is 1/2 gallon. then half would be 1/4.

would it work this way. there are 20 quarter gallons in 5 gallons.

so if you divide 21(the % abv of the rum) by 20(to dilute it into 5 gallons)

you get .0105. so am i basically adding 1% abv to my brew going from 5.74% to 6.74%
It's an okay estimate, but:
1. You're ignoring the increase in the total volume and
2. A handle of rum isn't 1/2 gallon, though it's kind of close. A half handle is about .231 gallons. So you're inflating your alcohol estimate there.

EDIT:
And
3. Are you totally sure that rum is 21% ABV? That's very low. I've never seen anything like it.
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On deck: Little Bo Pils, Bretta Off Dead (Brett pale)
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On tap: Saison Duphunk (sour), Amarillo Slim (IPA), Earl White (ginger/bergamot wit)
Bottled: Number 8 (Belgian Strong Dark Ale), Eternale (Barleywine), Ancho Villa (Ancho/pasilla/chocolate/cinnamon RIS), Oak smoked porter (1/2 maple bourbon oaked, 1/2 apple brandy oaked)

 
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Old 03-06-2009, 11:09 PM   #10
jonp9576
 
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the rum was one of those parrot bay flavored rums. along the lines of malibu. thats why it was such a low ABV
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