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Old 05-12-2011, 11:05 AM   #1
VAShooter
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Feb 2011
Chesterfield, Virginia
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Is this calculator correct? I plugged in my numbers and according to this calculator I only have 48% efficiency.

http://www.brewersfriend.com/brewhouse-efficiency/

My recipe was:
#7 German Wheat
#4 German Pils
#.5 Rice hulls

Preboil was 7.5 with a gravity of 1.025. My OG post poil nailed the target at 1.051.
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Old 05-12-2011, 11:44 AM   #2
Wagon_6
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Seeing how you hit your post-boil gravity, I think the preboil measurement was an inaccurate reading. Did you stir everything in the boil kettle really well before taking a measurement? What are you measuring with? What was the temperature when you measured?

 
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Old 05-12-2011, 12:02 PM   #3
VAShooter
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Feb 2011
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Quote:
Originally Posted by Wagon_6 View Post
Seeing how you hit your post-boil gravity, I think the preboil measurement was an inaccurate reading. Did you stir everything in the boil kettle really well before taking a measurement? What are you measuring with? What was the temperature when you measured?
You're probably right. It was eyeballed based on markings that I made on the Kettle. I did not stir and not sure of the temps...Maybe 120ish.

That was my 2nd AG batch and I'm just getting into figuring out how to measure effieciency.
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Old 05-12-2011, 12:12 PM   #4
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Quote:
Originally Posted by VAShooter View Post
I did not stir and not sure of the temps...Maybe 120ish.
If you're not sure of the temp, how did you measure your pre-boil SG?
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Old 05-12-2011, 12:31 PM   #5
Wagon_6
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Stirring after all your runnings is important since there can be "layers" of gravity in the kettle (high gravity runnings in the beginning and lower gravity towards the end). Temperature is also key when measuring with a hydrometer, most are calibrated around 60F.

Welcome to all grain!

 
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Old 05-12-2011, 02:23 PM   #6
VAShooter
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Feb 2011
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Quote:
Originally Posted by El Pistolero View Post
If you're not sure of the temp, how did you measure your pre-boil SG?
Stuck the hydrometer in a test sample from the runnings in the BK.

I was, am, unaware that temps impacted Hydro readings. Is there a calculator somewhere? What temp do I need to be to accurately check my preboil gravity?

Stirring the running smakes perfect sense. I'l be sure to do that on my next batch.
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Old 05-12-2011, 02:25 PM   #7
VAShooter
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Feb 2011
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Quote:
Originally Posted by Wagon_6 View Post
Stirring after all your runnings is important since there can be "layers" of gravity in the kettle (high gravity runnings in the beginning and lower gravity towards the end). Temperature is also key when measuring with a hydrometer, most are calibrated around 60F.

Welcome to all grain!
Oops - Missed the 60* comment. So basically after I collect the runnings, stir the wort - Collect a sample and allow it to cool before checking my SG? Makes sense.
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Old 05-12-2011, 03:06 PM   #8
Wagon_6
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Exactly. Stir for a few minutes after everything is collected and take your sample. While you get use to AG, I recommend taking that sample and chilling it down (stir it while it's in an ice bath in the sink) while your wort gets to a boil so you can see if you hit or missed your gravity. This will allow you to start dialing in your systems efficiency and make adjustments to your hop schedule if your low or add more water if your high on the gravity, etc.

 
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Old 05-12-2011, 03:16 PM   #9
VAShooter
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Feb 2011
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Quote:
Originally Posted by Wagon_6 View Post
Exactly. Stir for a few minutes after everything is collected and take your sample. While you get use to AG, I recommend taking that sample and chilling it down (stir it while it's in an ice bath in the sink) while your wort gets to a boil so you can see if you hit or missed your gravity. This will allow you to start dialing in your systems efficiency and make adjustments to your hop schedule if your low or add more water if your high on the gravity, etc.
Good advice. Thanks. I've got recipes en route form AHS so I'll be sure to add this to my process.
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