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Old 09-13-2012, 04:29 AM   #1
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Default Hop usage with partial boil/ LME addition

So hop utilization is increased when you keep half of the LME out until the last 15 min of the boil.

Is there a good way to figure out how recipes using this method?

None of the hop calculators I use have LME additions built in and to make it harder I'm only boiling 3.5 gallons out of a 7 gallon batch.

Here is what I playing at: Using brewer's friend IBU calc, 3.5 gallon boil for a 7 gallon batch. Est. OG .063. When I boil all the LME for 60 min I need to use 1.5 oz of bittering. If I save half of the LME until the last 15 min and thereby cut the estimated OG to around half ( .035 is what I typed into the calc) then I only need to use 1 oz.

Does that sound about right?


7 Gallon Recipe

9 lbs LME
1 lbs 2 row
1 lb brown sugar
.75 lb 60L
.25 lb 20L
.25 lb roasted barley
.25 lb chocolate
.5 lb flaked oats


1 or 1.5 oz glena High alpha 13.4% @60
1 oz saaz 3.3% @ 15 Min
.5 oz saaz 3.3% @ 5 Min
.5 oz saaz 3.3% @ Dry hoped in primary

I want to get around 35 IBUs

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Old 09-13-2012, 06:19 PM   #2
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Beer calculus has an option for late boil additions, and they also have a way of taking into account partial boils with topping off, check it out:

http://beercalculus.hopville.com

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Old 09-14-2012, 12:41 AM   #3
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Nice thanks for the info. It's what I have been looking for.

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Old 09-14-2012, 12:59 AM   #4
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Well using the Beer Calculus web site it looks like I'm going to add the whole 2 oz of galena for the whole boil.

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Old 09-14-2012, 01:48 AM   #5
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Wow. Beer calculus is awesome.

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Old 09-14-2012, 03:41 PM   #6
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Saved the link to try out later myself. If this PM kit turns out good,it'll help a lot.
Anyway,when I do 6 gallon batches with partial boil & late extract additions,I use at least 2oz of flavor hops. .5-1oz bittering. They are comparable to commercial examples,maybe better according to my son. He drinks all kinds of craft beers.
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Old 09-18-2012, 02:55 PM   #7
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Quote:
Originally Posted by vegas20s View Post
Wow. Beer calculus is awesome.
Glad you've found it useful! It is definitely a great tool.
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