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Old 03-13-2009, 02:01 AM   #1
Patton191
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Default How may IBUs is this Irish Red Ale?

I am trying to get a handle on the whole bitterness of beers. I made this a couple of months ago and would like to attach a number to the taste so to speak.

Specialty Grains


* 0.5 lbs. Dingemans Caramel Pils
* 0.25 lbs. Briess Special Roast
* 0.125 lbs. Dingemans Biscuit
* 0.125 lbs. Simpson's Chocolate

Fermentables


* 6 lbs. Gold Malt Syrup

Boil Additions


* 1 oz. Willamette (60 min)
* 1 oz. Kent Goldings (30 min)




* Danstar Nottingham Ale Yeast. Optimum temperature: 57-70° F.


Also this is a sort of a stupid question, but do specialty grains have any sort of impact on IBU? I know malt does.


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Old 03-13-2009, 02:04 AM   #2
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What size boil did you do? That impacts the IBUs the most, due to the lower hops utilization of a partial boil.

If you didn't use any base malt, the specialty grains you steeped would not add much in the way of fermentables, although biscuit malt can be mashed to provide some fermentables.


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Old 03-13-2009, 02:05 AM   #3
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Also, what were the AAUs of the hops? You need that number to accurately calculate the IBUs.
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Old 03-13-2009, 02:11 AM   #4
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Assuming a 5-gallon batch, basic extract brew with specialty steep method, and average AA% for these hops, BeerSmith (Rager method) gives you approximately 30 IBUs
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Old 03-13-2009, 02:35 AM   #5
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Oh stupid me I should have mentioned I did a 2-3 gallon boil, Probably around 2 1/2. I don't know the AA%, so I guess the average %. Northernbrewer didn't say.
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Old 03-13-2009, 02:38 AM   #6
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Quote:
Originally Posted by Patton191 View Post
Oh stupid me I should have mentioned I did a 2-3 gallon boil, Probably around 2 1/2. I don't know the AA%, so I guess the average %. Northernbrewer didn't say.
did you ferment only 2-3 gallons or did you top off to ~5 when you put your wort into the fermenter? (my above post assumes the latter)
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Old 03-13-2009, 02:43 AM   #7
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Sorry again, Yeah it was a 5 gallon batch, I just topped it up with water.
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Old 03-13-2009, 12:19 PM   #8
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I get 18.6 IBUs with a 2.5 gallon boil, and an OG of 1.048, using the Willamette at 4.1% AAU, and the EKG at 6.2%. The AAUs are on the package you get, so next time jot it down in your notes. If you like this recipe and want to make it again, it's good to know what the % is on the hops so you can recreate it.
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Old 03-13-2009, 02:01 PM   #9
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Quote:
Originally Posted by YooperBrew View Post
I get 18.6 IBUs with a 2.5 gallon boil, and an OG of 1.048, using the Willamette at 4.1% AAU, and the EKG at 6.2%. The AAUs are on the package you get, so next time jot it down in your notes. If you like this recipe and want to make it again, it's good to know what the % is on the hops so you can recreate it.
Can I ask how you came up with 18.6? It's much different than what I got using BeerSmith. Which method did you use?
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Old 03-13-2009, 04:48 PM   #10
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Quote:
Originally Posted by YooperBrew View Post
I get 18.6 IBUs with a 2.5 gallon boil, and an OG of 1.048, using the Willamette at 4.1% AAU, and the EKG at 6.2%. The AAUs are on the package you get, so next time jot it down in your notes. If you like this recipe and want to make it again, it's good to know what the % is on the hops so you can recreate it.
Ok, yeah I will definitely do that next time, thanks a lot.


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