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Old 03-01-2012, 04:12 AM   #1
sirmichael
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Default Gravity question on fruit beer

A few weeks back I brewed an all extract wheat. This past Saturday I mashed up and boiled 11 cups of huckleberries and racked my five gallons on the huckleberry purée. I took a gravity reading before primary fermentation (1.057) and I had a steady reading for three days (1.018) before moving to secondary. I did not take another reading after adding the huckleberries and moving to secondary. Can I still find out my ABV after secondary is complete? There is a very nice krausen layer going on right now.

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Old 03-01-2012, 02:07 PM   #2
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You would need to find the sugar contribution of the huckleberry puree to find out your ABV.

Looks like there are 2.4 grams of sugar per 28 grams of huckelberries. I have no idea how many grams of huckelberries fit in 11 cups.

If you could approximate the weight of 11 cups of the berries, we could figure out the sugar contribution and overall ABV.

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Old 03-01-2012, 06:00 PM   #3
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So does this math make sense.

11 cups of huckleberry.
16 cups in a gallon.
4.5 pounds of huckleberries per gallon
2.4 g of sugar per 28 g of huckleberries = .0857 g of sugar per g of huckleberries


11/16 =.6875 gallons
.6875 x 4.5 lbs = 3.09 pounds

454g/lb

3.09 x 454 = 1402 g

1402 x .0857 = 120.17 g of sugar from huckleberries or .265 lbs of sugar

Added 160 g of sugar to sweeten huckleberries

160/454 = .352 lbs of sugar

Total sugar added = .617 lbs at 46 ppg = 28.4.

Would I then add this to my original gravity reading?

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Old 03-01-2012, 06:07 PM   #4
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I forgot to add that it's a 5 gallon batch. Assuming the 28.4 is somewhat close, I would then divide it by 5 right? So 5.68.

Brewing is hard on my math skills.

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Old 03-01-2012, 07:20 PM   #5
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You've asked the wrong guy to check your math, but assuming it's all right, and you added 28.4 grams (0.617 lbs) of extra fermentables with the fruit, that would have added 0.006 gravity points, so you are at about 1.063 aggregate OG, 1.018 FG = 6% ABV.

Without the Huckelberries, you would be at about 5.3% ABV, so the fruit and sugar in secondary add about 0.7% ABV to the overall brew.

That sounds about right to me! I have a math headache now!

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Old 03-01-2012, 07:32 PM   #6
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It seems to me that you would add your sugar contribution to your final gravity (1.018), let it finish eating the berries and take another reading. This ABV would be added to your original ABV. Your way would work, but doesn't account for anything like the yeast not eating all of the sugar you added or somehow kick starting it to eat all your added sugar, plus some remaining sugar from your first fermentation.

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Old 03-01-2012, 11:57 PM   #7
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Thanks everyone. I guess as long as it tastes good I don't really care what the ABV comes out too.

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