Quote:
Originally Posted by smagee
Koz is correct; the only variable is the specific AA% on the Centennial that you have. If you ended up with a batch in the 8.5% range, you'll need to up the additions slightly (or shift their timing, if you prefer). If yours are upwards of 10.5%, scale down accordingly. Using Beersmith, this is easy; since you know the IBUs you're shooting for (~20ish), enter the recipe as listed above. Then double-click your hop additions and specify the AA% your Centennial has. If yours are lower, your IBUs will drop a bit, so simply increase the amount of one of the additions until the IBUs are back in the vicinity of 20.
Or, just do what I did when I was doing partial boils and just let it ride  . Since this beer is specifically designed to be low-IBU, I wouldn't worry terribly much about it. Lower might actually be a boon for the BMC crowd on this one. That said, when I last made it, my LHBS and I determined that it needed a bit more bitterness than I ended up with. Next time, I'll err on the side of more hops.
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Sorry, you lost me on the Beersmith recipe edits. I downloaded the free trial and started to input the recipe, but I'm confused about the hops. I'm clear on everything else but don't know what to do in terms of the AA% for the hops. Any help is really appreciated and sorry for the ignorance. I will have to familiarize myself with this software. I'm doing the extract version in a 5 gallon pot. Thank you
Batch Size: 5.50 gal
Boil Size: 3.00 gal
Estimated OG: 1.041 SG
Estimated FG: 1.010 SG
Estimated Color: 3.2 SRM
Estimated IBU: 19.4 IBU
Boil Time: 55 Minutes
Ingredients:
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Amount Item Type % or IBU
5.00 lb Extra Light Dry Extract (3.0 SRM) Dry Extract 83.3 %
1.00 lb Cara-Pils/Dextrine (2.0 SRM) Grain 16.7 %
0.375 oz Centennial [9.50%] (55 min) Hops 8.6 IBU
0.375 oz Centennial [9.50%] (30 min) Hops 6.8 IBU
0.375 oz Cascade [7.80%] (10 min) Hops 2.6 IBU
0.375 oz Cascade [7.80%] (5 min) Hops 1.4 IBU
1 Pkgs Nottingham (Danstar #-) Yeast-Ale