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Old 07-06-2009, 01:08 AM   #1
michael.berta
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May 2007
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Hello,

I am having problems with attenuation on a Stout that I brewed. Here is the basic recipe:

::::TEN GALLONS:::

Grain:

20LBS American 2-row
2 LBS flaked oats
1LB Chocolate Malt
1LB Roasted Barley

Hops:

3 OZ East Kent Goldings 60 minutes
1 OZ East Kent Goldings 15 minutes

Yeast:

4 packages of rehydrated Nottingham Ale Yeast. (2 packets per 5 gallons.)

OG 1.060
expected FG 1.014

I brewed this on 6/10 and current gravity is down to only 1.020 giving 66% attenuation. I checked the gravity on 6/18 & today and it was the same.

Seems a bit low for Nottingham? Especially since I pitched two packets per 5 gallons. My hydrometer is calibrated. I aerated the wort with a stir rod before pitching. Wort temperature is 70ish degrees.

I'm not too freaked out about 6 gravity points; especially for a stout. But I still want to be able to hit my FG....

 
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Old 07-06-2009, 02:23 AM   #2
jezter6
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Maybe you're overpitching the living crap out of it? I don't see the need for 2 dry packs per 5 gallons if this is only a 1.060 brew.
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Old 07-06-2009, 02:33 AM   #3
purechaos
 
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I believe (not sure) I read you can make a starter and then pitch it to restart fermentation

I have only brewed 7 AG batches and all have been with a starter all have finished at or below target FG

 
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Old 07-06-2009, 02:48 AM   #4
WorryWort
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before you do anything warm it up 2 or 3 degrees if you can - this won't affect the flavour. Keep it in the primary for 2 weeks total. If it hasn't changed by that point it's not going to.
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Old 07-06-2009, 02:50 AM   #5
Wayne1
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What temp did you mash at? If you were toward the high side, 158F you would create lots of unfermentable sugars. If you keep your temps lower, 148-152F, you will make a more fermentable wort and your final gravity will be lower.

Creating a yeast starter is a good thing for liquid yeasts. For dry yeast, a starter is not needed. Rehydrating the yeast is a good idea. 4 packets is NOT too much for 10 gallons. I really don't think you can OVER pitch yeast. Under pitching is far more a common failing.

I am currently enjoying a pale ale which started at 1.050 and finished at 1.010. Mashed at 158F. 10 gallons of final product pitched with 4 packets of rehydrated S-05. VERY NICE!

 
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Old 07-06-2009, 02:59 AM   #6
scinerd3000
 
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you only need 2 packets for this brew but overpitching wont hurt your attenuation to my knowledge...i find that odd however because nottingham is a champ and i have never had under attenuation. What was your mash temperature? How Long did you mash and did you check for starch conversion with an iodine test?
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Old 07-06-2009, 03:34 AM   #7

+1 on your mash temperature perhaps being on them higher side and leading to a fuller-bodied beer (more unfermentables).

 
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Old 07-06-2009, 01:04 PM   #8
brian_g
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Quote:
Originally Posted by scinerd3000 View Post
you only need 2 packets for this brew but overpitching wont hurt your attenuation to my knowledge...i find that odd however because nottingham is a champ and i have never had under attenuation. What was your mash temperature? How Long did you mash and did you check for starch conversion with an iodine test?
In this episode of the Strong Brew podcast they mentioned that overpitching can hurt attenuation.

http://www.thebrewingnetwork.com/mem...ch03-23-09.mp3

I don't have any direct experience in the matter, but those guys seem to know their stuff. It does seem somewhat counter intuitive though, since some people do a "fast ferment test" (small volume of wort, high pitching, high temp) in order to the fermenablitity of there wort.

Fast Ferment Test - German Brewing Techniques

 
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Old 07-06-2009, 01:09 PM   #9
brian_g
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I shared the stuff on over pitching for general interest, I don't expect that is the problem. I suspect mash temperature. What were your mash temperatures? Did you mash the Roasted Barley and Chocolate Malt with the 2-row or did you mash /steep them separate?

 
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Old 07-06-2009, 03:51 PM   #10
michael.berta
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I mashed at 153 degrees for 60 minutes and then a mash out at 168 degrees. I did not do an iodine test but I did check my OG before pitching at it was 1060...

 
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