Happy HolidaySs Giveaway - Last Sponsor Giveaway of the Year!

Come Enter the BrewDeals/FastFerment Giveaway!

 Home Brew Forums > hop additions
03-19-2007, 12:47 PM   #1
Proofman
Feedback Score: 0 reviews
Recipes

Join Date: Jan 2007
Posts: 288

I want to do a recipe (nut brown ale) that calls for 1 oz of Willamette with 5.8% aa and a 3 gallon boil. The Willamette I’m buying has 3.9%aa and I’m going to do a 2.5 gallon boil. How do I adjust the hop addition to get the desired bitterness?

__________________

03-19-2007, 03:21 PM   #2
paranode
Feedback Score: 0 reviews
Recipes

Join Date: Mar 2007
Location: DFW, TX
Posts: 433
Liked 1 Times on 1 Posts

The first question is how long is each part of that 1 oz going to be in the boil? The 1 oz for 60 mins?

__________________

03-19-2007, 03:35 PM   #3
david_42
Feedback Score: 0 reviews

Recipes

Join Date: Oct 2005
Location: Willamina & Oak Grove, Oregon, USA
Posts: 25,656
Liked 136 Times on 129 Posts

1 x 5.8 = 5.8 5.8/3.9 = 1.5 oz.

The difference in utilization for a 2.5 gallon batch and a 3 gallon batch is minor, so don't worry about it.

__________________

Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"

"I would like to die on Mars, just not on impact." Elon Musk

03-19-2007, 03:55 PM   #4
Proofman
Feedback Score: 0 reviews
Recipes

Join Date: Jan 2007
Posts: 288

It is a 60 min boil for the only hop addition.

David 42, thanks for the advice. I tried to get the answer one way and was totally wrong and supected the way you showed me was the correct one
(AAU = %aa X oz).

Just curious as to how you would firgure the hop addition if the boil was significantly different, say a full 5 gal boil?

__________________

03-19-2007, 06:03 PM   #5
AFK ATM
Feedback Score: 0 reviews

Recipes

Join Date: Aug 2006
Location: People's Republic of Cambridge
Posts: 3,323
Liked 6 Times on 6 Posts

If your math skills are at all like mine you might want to think about investing in some brewing software; it's not that expensive (one of the cheaper things I bought for this "hobby") and it will do most of the calculations for you. I know ProMash also has a free evaluation version that is fully functional.

__________________
And now we go AG!

Planning: Extra Special Bitter

03-20-2007, 02:24 PM   #6
Proofman
Feedback Score: 0 reviews
Recipes

Join Date: Jan 2007
Posts: 288

Last night I downloaded Beersmith and am very impresses with it in regard to how user friendly it is. I was curious on how to adjust hop additions for changing boil volumes. I entered my proposed recipe and immediately started navigating my way through it without any problem. This program is very intuitive. Within 15 min or so I had my recipe entered and I spent the rest of my time playing with ingredients and amounts to see how it affected the parameters of the beer.

I recipe I entered gave me an estimate OG of 1.045 and an IBU of ~15 (nut brown ale). The recipe gave an OG of 1.054 and IBU 18. I wouldn’t think that this would be a problem, would it?

I question the OG given in the recipe. It calls for Briess light LME which according to the Briess has an extract efficiency of 0.034 per lb per gal. I don’t believe that that extraxt can give an OG that high?

__________________