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Old 11-11-2011, 08:40 PM   #11
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Originally Posted by foltster

All the efficiency is measuring is how much of the potential sugar you have released from the barley. The missing percentage is what you havent rinsed out of the mash. We don't get 100% because it is difficult to extract that last little bit without using mechanical means.
Got it. So just to change my wording: I'm wondering if I rinsed out more converted sugar than expected, raising the expected gravities all around.

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Old 11-11-2011, 08:48 PM   #12
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yes, but going 3 pts higher in OG doesnt equate to 9 pts higher in fg. it should only raise it about 1pt

from what you've told us, nothing sounds wrong with what you did so im a bit confused why you have a stuck ferment. give the warmer temps and agitation a shot and hopefully it does the trick. if it doesn't, there are some more ways to try to restart a fermentation, or you can just let it be if you feel safe bottling it since it tastes good as is.

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Old 11-11-2011, 08:56 PM   #13
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Originally Posted by dcp27
yes, but going 3 pts higher in OG doesnt equate to 9 pts higher in fg. it should only raise it about 1pt

from what you've told us, nothing sounds wrong with what you did so im a bit confused why you have a stuck ferment. give the warmer temps and agitation a shot and hopefully it does the trick. if it doesn't, there are some more ways to try to restart a fermentation, or you can just let it be if you feel safe bottling it since it tastes good as is.
Sitting tight. Temp already sitting about 68. Hoping to see it around 70.

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Old 11-11-2011, 09:02 PM   #14
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I think you are going down the right path here. If you raise the temp and see no significant change in FG then the yeast has likely consumed all the sugar it is going to.

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Old 11-11-2011, 09:29 PM   #15
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Got it. So just to change my wording: I'm wondering if I rinsed out more converted sugar than expected, raising the expected gravities all around.

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No, you WANT to rinse out all of the sugars you can. You didn't do too badly, getting 79%- a typical homebrew efficiency.

I really feel that your thermometer is off. No way a 1.050ish OG with nottingham would finish at 1.020 unless you mashed at 155/156. But if your thermometer is even 2 degrees inaccurate, that could easily be what happened! I'd double check that thermometer calibration before you brew again.
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Old 11-11-2011, 10:09 PM   #16
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Quote:
Originally Posted by Yooper

I really feel that your thermometer is off. No way a 1.050ish OG with nottingham would finish at 1.020 unless you mashed at 155/156. But if your thermometer is even 2 degrees inaccurate, that could easily be what happened! I'd double check that thermometer calibration before you brew again.

Makes perfect sense. I was looming to get a digital thermometer to leave in the mash, so maybe I'll do that now. I'm glad I asked, because in my mind I had only considered a fermentation issue and I'm too knew at AG to know what to think about there. Thanks again.

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Old 11-12-2011, 12:22 AM   #17
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Makes perfect sense. I was looming to get a digital thermometer to leave in the mash, so maybe I'll do that now. I'm glad I asked, because in my mind I had only considered a fermentation issue and I'm too knew at AG to know what to think about there. Thanks again.

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There a lots of factors in attenuation- yeast strain, mash temperature, ingredients, yeast health and oxygenation, temperature, etc.

But in this case, while there is some crystal and Munich malt in your grainbill (assuming, since you said Fat Tire clone), there aren't going to be many unfermentables unless you mashed at a high temperature.

Since you had good conversion apparently and good lautering efficiency, used a well-attenating ale yeast, had fermentable ingredients, etc, only a couple of things could be the cause. One would be poor yeast health- like under aeration of the wort- but more likely it is a too-high mash temperature leaving too many unfermentable long-chained sugars.
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Old 11-13-2011, 03:17 PM   #18
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No movement after three days. I'm kegging it tonight. Amazing beer will have to now just be really great beer. Learned a lot on this thread, though. Thanks all.

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Old 02-21-2012, 05:25 PM   #19
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Quote:
Originally Posted by Yooper View Post
I really feel that your thermometer is off. No way a 1.050ish OG with nottingham would finish at 1.020 unless you mashed at 155/156. But if your thermometer is even 2 degrees inaccurate, that could easily be what happened! I'd double check that thermometer calibration before you brew again.
Sorry to wake this old thread, but today I calibrated the thermometer I had used on that brew day with two others that were consistent with each other. Turns out my "old" thermometer was almost 10 degrees off! Thank you so much for helping me to realize that could be the issue. I had brewed again between that batch and today's and the batch in between was definitely off as well.

Appreciate the help.
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