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-   -   Attenuation question (http://www.homebrewtalk.com/f163/attenuation-question-383862/)

Chris5899 01-23-2013 10:45 AM

Attenuation question
 
I just brewed my first AG beer, an IPA. OG was 1.064, one week after pitch is 1.007. My question is, does the change in gravity tell me anything about whether my yeast pitch was correct or if i should expect any particular off-flavors, etc? New to brewing and trying to use this experience to better educate myself for next time.

BPal75 01-23-2013 10:52 AM

That's crazy high attenuation. What yeast did you pitch? What temps did you mash at or are you using extract?

dcarter 01-23-2013 10:57 AM

I agree, that's a high attenuation for one week. Did you make a starter and was the starter wearing a cape?

Chris5899 01-23-2013 11:01 AM

Mashing was sketchy......after initial strike i was low at 147 (target was 151), took better part of an hour to get it up to target (don't ask, see my thread 'brew day fiasco!!). I used wlp001 which i used in a 2 liter stater (per mr malty and beersmith). Fermented in a closet at around 68 - 70 ambient temp.

Sorry for the choppy sentences, on my mobile.

WoodlandBrew 01-23-2013 11:05 AM

From that you can derive apparent attenuation and ABV of 89% and 7.48% ABV. That would be reasonable for a beer that has more than 10% simple sugars such as sucrose. And could be reasonable for an all malt beer mashed at about 145 for more than 90 minutes.

Knowing recipie, mash temp, yeast, and fermentation temperature will help.

Taste buds are the best way to detect off flavors that I have found.

If you did a fast ferment test in parallel to the fermentaion it might give you a better idea about the health and quantity of yeast pitched, but without that data it's a guess.

fishersfirst 01-23-2013 11:07 AM

There you go:

High attenuating yeast, lower mash temp, sizeable starter, all contribute to the high attenuation.
Provided the fermentation temps and sanitisation are all good, you shouldn't have any off flavours.

WoodlandBrew 01-23-2013 11:14 AM

Was the fermentation fast and furious? At those temperatures and if the starter was done to optimize yeast growth, and no water bath the fermentation temperature may have approached 75 or even 80. An extended rest period may be in order if you taste cider like flavors.

Chris5899 01-23-2013 11:24 AM

Fermentation started within 12 hours and stopped (at least bubbling in the airlock) at about 48 hours. No airlock activity at all after that. I had 5.25 gallons in a 7 gallon pail, krausen never hit the lid. Friday will be 2 weeks and I'll be racking to a secondary and dryhopping for 5 days then cold crash 2 days then bottle. I'll be checking the gravity again when i rack.

WoodlandBrew 01-23-2013 12:05 PM

Sounds good. If it does taste a little like solvent, hard alcohol or cider you might consider a water bath or swamp cooler for next time.

Here is my setup:
http://woodlandbrew.blogspot.com/2012/09/swamp-cooler.html

Chris5899 01-23-2013 02:32 PM

Thanks everyone, i appreciate the feedback. When i tasted it after 1 week, it seemed ok, not like solvent. It was hoppy and clean so hopefully everything is on track.


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