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Author Topic: math question  (Read 1126 times)

Offline csu007

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math question
« on: October 02, 2015, 11:47:29 pm »
So I have hopefully simple math question for people much smarter than I.
So i recently just bottled a huckleberry blonde ale.
here my numbers
•   Estimated O.G.- 1.059 , Actual O.G- 14 brix or 1.057
•   Estimated F.G.- 1.013, Actual F.G- 1.005 hydrometer, 5brix refractomter 1.006
My question is- would the the huckleberries really drop the FG 10pts (over 2wks)? I used a hydrometer for the 1.005 and refractometer for the brix reading adjusted using brewersfreind online calculator.
my estimated abv was 6.06 and with the hydrometer would be 6.8
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Offline charles1968

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Re: math question
« Reply #1 on: October 03, 2015, 01:56:48 am »
What quantity of huckleberries did you use? The sugar in fruit is all fermentable so a large amount of fruit will lower the FG. I used to make fruit wines a lot and they would often finish under 1.000, i.e. lower than pure water. I reckon your sums are right but the predicted FG was out.

Offline dmtaylor

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Re: math question
« Reply #2 on: October 03, 2015, 06:06:14 am »
charles1968 is correct.  Fruit sugars are nearly 100% fermentable.  Ciders and wines usually finish fermenting below 1.000, down to about 0.992.  You are experiencing some of that in your fruit beer where the fruit and the beer are sort of averaging out to the FG of 1.005.  You do indeed have 6.8% ABV in your fruit beer.  Next time you could mash hotter or use a lower attenuating yeast to compensate, or you could also add a pound of lactose or maltodextrin per 5 gallons to increase FG by about 9 points (those two sugars are not fermentable).
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Offline TexasHumuluslupulushead

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Re: math question
« Reply #3 on: October 03, 2015, 08:14:10 am »
As they both stated...

I just did a 5.5g batch of an all mosaic IPA which I racked onto 3lbs of blueberries

I racked it with a final gravity of 1.012 and after 2 weeks it was an amazing fusia color and dropped to 1.008
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Offline csu007

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Re: math question
« Reply #4 on: October 03, 2015, 08:28:43 am »
Sweet thanks.  I racked  5 gal onto 3.5lbs. Good to know in the future with fruit additions.
“Sometimes when I reflect back on all the beer I drank, I feel ashamed. Then I look into the glass and think about the workers in the brewery and all of their hopes and dreams. If I didn’t drink this beer, they might be out of work and their dreams would be shattered. Then I say to myself, “It is better that I drink this beer and let their dreams come true than be selfish and worry about my liver.

Offline a10t2

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Re: math question
« Reply #5 on: October 03, 2015, 10:33:19 am »
I'm your huckleberry…

What was the FG prior to adding the fruit?
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