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Old 01-16-2013, 01:25 AM   #1
crbrown25
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First time using Nottingham. I've read it has a high attenuation. But i've had a 1.054 porter sitting at 63 degrees for 17 days and have only gotten down to 1.017. 68%, right? Has anybody else had this happen?
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Old 01-16-2013, 01:52 AM   #2
chipsah
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Originally Posted by crbrown25 View Post
First time using Nottingham. I've read it has a high attenuation. But i've had a 1.054 porter sitting at 63 degrees for 17 days and have only gotten down to 1.017. 68%, right? Has anybody else had this happen?
Recipe? AG or extract, % of specialty grains, mash schedule (if AG), etc...
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Old 01-16-2013, 02:00 AM   #3

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Originally Posted by chipsah View Post
Recipe? AG or extract, % of specialty grains, mash schedule (if AG), etc...
Yes, percentage attenuation is only one factor. Fermentability of the wort is a critical variable. For example, if I extract more complex sugars with a higher mash temperature, the fg will be higher than if the mash temperature was lower.

 
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Old 01-16-2013, 02:12 AM   #4
crbrown25
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9# Maris Otter
.75# Light Munich
.36# Black
.25# Chocolate
1#Crystal 20
1# Clover Honey (maybe this has something to do with it?)
mash 1hr @ 156 deg (or this?)

...only my 4th all grain batch (BIAB) so i'm still trying to get the gist of how mash temps affect FG and body.
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Bottled: East Riding of Yorkshire Northern English Brown Ale, Brown House Honey Porter, EdWort's Apfelwein, 1876 IPA

 
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Old 01-16-2013, 02:23 AM   #5

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Originally Posted by crbrown25 View Post
9# Maris Otter
.75# Light Munich
.36# Black
.25# Chocolate
1#Crystal 20
1# Clover Honey (maybe this has something to do with it?)
mash 1hr @ 156 deg (or this?)

...only my 4th all grain batch (BIAB) so i'm still trying to get the gist of how mash temps affect FG and body.
The range of mash temps is about 148F - 158F, so your 156F mash temp was on the high end of the range. This will produce a less fermentable wort and lead to a higher fg. For a medium body beer, I usually mash at 152 - 154.

 
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Old 01-16-2013, 02:41 AM   #6
crbrown25
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Jun 2011
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Thanks. Good info. I gave it a gentle swirl and raised the temp up to 70, so we'll see if it'll drop a couple points, which i guess is unlikely at this point. If not, i guess i'll just have a slightly sweeter & fuller porter. Either way, i'll drink the heck out of it.
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