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Old 02-27-2011, 04:51 PM   #1
jimlin
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Going to do a partial boil, extract brew. Can't yet go full boil as I don't have the pot for it. Given that it's going to be half DME and half LME (plus a pound of caramel malt 40L steeped), I intended to boil most of the DME but add the LME late. This is going to greatly effect the hop addition schedule.

The recipe I have calls for Magnum for 60 min, Perle for 30, and then a couple late Cascade additions. However, by adding the LME late, that hop schedule gives me an IBU (in BeerAlchemy) of about 48. I change the Magnum and Perle times to 30 and 20 min, and then the IBU drops to 40 (SV site lists their Pale at 37 IBU).

My question is will the Magnum and Perle time changes change the hop flavor dramatically in addition to lowering the IBU.

 
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Old 02-27-2011, 05:09 PM   #2
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It will drastically change how bitter the beer is if you are boiling magnum (14%aa+/-) for half of what the recipe calls for. If you're trying to make a sierra clone why would you change how bitter the beer is?

 
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Old 02-27-2011, 05:22 PM   #3
frazier
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If you are trying to lower the IBUs, better I think to scale back the amounts, rather than change the timing of the additions.
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Old 02-27-2011, 06:06 PM   #4
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did you change the boil size to partial? the boil size is going to effect isomerization much more than a late extract add (which actually has been shown to not effect utilization since its break material not OG that alters it)

 
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Old 02-27-2011, 06:15 PM   #5
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But if it's an extract brew is there really any break material?

 
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Old 02-27-2011, 06:50 PM   #6
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not usually, which is why its been shown that late adds dont actually effect utilization

 
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Old 02-27-2011, 07:10 PM   #7
jimlin
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Ok... I think I screwed up by entering everything for a partial boil and had my hop measurements off. SO I backed up, entered everything as if doing a full boil instead of a partial. Came up with only needing .25 oz of both the Magnum (60 min) and the Perle (30 min). Hit 37 IBU on the head. Now I'll adjust the process in BeerALchmey to go to a partial (3 gal boil) and see how I need to adjust the Magnum and Perle to maintain kep the IBU at 37

 
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Old 02-27-2011, 07:11 PM   #8
jimlin
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Quote:
Originally Posted by frazier View Post
If you are trying to lower the IBUs, better I think to scale back the amounts, rather than change the timing of the additions.
yup... not sure why I was looking at it the other way.

 
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Old 02-27-2011, 07:14 PM   #9
jimlin
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BTW, in BeerAlchemy, if I change the time of the addition of the 3.3 lb LME from end of boil to start of boil, it changes my IBU frmo 37 to 31 IBU. I intended to add the LME late, just using the DME for the full length of the boil (60 min).

 
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Old 02-27-2011, 07:59 PM   #10
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It is compensating for the supposed drop in efficiency.

 
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