Challenger440

Recipes 

Hey guys
I'm trying to convert a simple hop schedule to hit the desired IBU mark. The hops my LHBS carries are 4.5% and the recipe I am going from used 5.0%.

The recipe adds 1.0 oz Kent Goldings (5.0%) at 60 minutes, for 17.2 IBU. How many ounces of Goldings do I need to add at 60 minutes to hit 17.2 IBU?

Recipe: 1.0oz (5.0%) 60 min = 17.2 IBU
Me: ???oz (4.5%) 60 min = 17.2 IBU

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Primary #1: Empty
Keg #1: Apfelwein
Keg #2: Graff
Keg #3: Denny Conn's Bourbon Vanilla Porter
Keg #4: Simtennial Pale Ale
Bottled: Scottish 60/-, House Stout, Chocolate Oatmeal Porter
On Deck: Oatmeal Stout

humann_brewing

Recipes 

Here is the equation.

IBU = [W(oz)*AA%*U*7489]/V(gal)

the answer would be 1.02

IBU = [1.02*0.045*0.25*7489]/5

You can see by this that it doesn't matter much as I have found in brewing, ballpark is close.

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On tap: Batch 1 Flanders Red, experimental sour 1.072 > 1.000, #70 Simple, gone complex pale 1.063 4/5/13, #71 French IPA, American IPA with spanish cedar and fermented with 3711 1.059>1.008
Fermenting: #72 Flower power saison 1.053>1.004 with lavender and jasmine
Aging: #67 Bareleywine 1.116 11/07/2012, Flanders 2 batches 1.056 and 1.060 12/12/11 and 3/26/12, Smoked Porter 1.063 10/11, pepper RIS 1.088 7/11, Kriek, 1.052 12/11, RYE IPA sour experiment 8/12, Berliner Weisse 1.030 9/20/12

A4J

Recipes 

It's monday morning and maybe the answer is obvious, but what does U represent?

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Primary 1: pale ale
Primary 2: blondie

My mid-century modern keezer build thread.

humann_brewing

Recipes 

U is the time, .25 is for 60 minutes. Here is the article.

http://www.byo.com/stories/recipes/article/indices/50-recipe-calculations/412-calculating-gravity-bitterness-and-color-techniques

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On tap: Batch 1 Flanders Red, experimental sour 1.072 > 1.000, #70 Simple, gone complex pale 1.063 4/5/13, #71 French IPA, American IPA with spanish cedar and fermented with 3711 1.059>1.008
Fermenting: #72 Flower power saison 1.053>1.004 with lavender and jasmine
Aging: #67 Bareleywine 1.116 11/07/2012, Flanders 2 batches 1.056 and 1.060 12/12/11 and 3/26/12, Smoked Porter 1.063 10/11, pepper RIS 1.088 7/11, Kriek, 1.052 12/11, RYE IPA sour experiment 8/12, Berliner Weisse 1.030 9/20/12

A4J

Recipes 

utilization [time]. That's what I figured.

grassy-ass.

__________________
Primary 1: pale ale
Primary 2: blondie

My mid-century modern keezer build thread.

homebrewer_99

Recipes 

Divide 5 by 4.5 = 1.1 oz.

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HB Bill

Challenger440

Recipes 

Thanks guys!

__________________
Primary #1: Empty
Keg #1: Apfelwein
Keg #2: Graff
Keg #3: Denny Conn's Bourbon Vanilla Porter
Keg #4: Simtennial Pale Ale
Bottled: Scottish 60/-, House Stout, Chocolate Oatmeal Porter
On Deck: Oatmeal Stout