trn
Active Member
I'm making a few modifications to a batch of an IPA that came out quite good last time. I'm increasing OG to around 1.077 to get it into honest to goodness imperial IPA range. Using WLP001, I can get around 76% AA tops, which would leave me at FG=1.018. I want it to be a bit dryer, so I'm considering adding some dextrose after the main fermentation slows. After looking through the archives, this seems to be the most useful:
Since this is an extract batch, I'm thinking more in terms of gravity points. So if I were to keep aiming for 77 points, I can use about 73 points worth of extract and 4 of dextrose (5%) and I might expect AA more like the 79% in the example above.
Is this thinking right? I'm not really worrying too much about exact numbers, but I just want to have at least a rough idea of how much to add and if it really makes sense for me to be doing it.
For my IPA's, I always get 75% attenuation with WLP001. If I want more, I add sugar once fermentation has slowed/stopped. Boiled with water at a ratio of 1lb corn sugar per 1 cup water. I've found that if you take the percentage of the grain bill that the corn sugar will be and multiply it by .8, add that number to your attenuation (usually 75% for me) and you get your new expected attenuation. I like to target 1.012 depending on the grain bill and expected ABV. Don't want to add too high a % of corn sugar depending on the grain bill. Simple grain bills get a lower % of corn sugar.
So, if 5% of the grain bill will be corn sugar then 5% * .8 = 4% an I expect the final attenuation to be 75% (typical) + 4% = 79%. Works every time.
Since this is an extract batch, I'm thinking more in terms of gravity points. So if I were to keep aiming for 77 points, I can use about 73 points worth of extract and 4 of dextrose (5%) and I might expect AA more like the 79% in the example above.
Is this thinking right? I'm not really worrying too much about exact numbers, but I just want to have at least a rough idea of how much to add and if it really makes sense for me to be doing it.