When attempting to repeat an IPA when the hop AA's are different from crop to crop, do most of you attempt to obtain the same IBU's or same flavor/aroma? If you go for same IBU's do you alter your boiling times or do the formula to achieve the proper IBU's with same boil times as previous recipe?
IPA repeatability
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When making substitutions of the same hop with different AA%, I substitute each hop addition based upon adding an equivalent amount of AAs. For instance when substituting 20 grams of 10% AA hops at a 60 minute addition with the same hop having 11% AA, I take the AA contribution (20g x 10 = 200 AA units) and convert that to the new AA content (200 AA units / 11 = 18.2 g).
For dry hopping, I tend to keep the hop addition constant unless I have a full report on the total oil content for the hops I am looking to replace. Then I will do the same calculation using total oil content in place of the AA%.
For dry hopping, I tend to keep the hop addition constant unless I have a full report on the total oil content for the hops I am looking to replace. Then I will do the same calculation using total oil content in place of the AA%.
Yes, I use brewing software to account for the AA%.
I try to use whole numbers so i dont end up with .75 oz of 3 different hops sitting in my freezer for 6 months. So while adding or subtracting a couple grams is probably the best way, im more likely to change the timing of the addition by 5 minutes or whatever small amount it takes.
