Author Topic: How can you get 105 IBU from Stone Ruination IPA clone in Zymurgy July/August  (Read 11351 times)

Offline therealmccoy

  • 1st Kit
  • *
  • Posts: 9
    • View Profile
Hello,

How can  you get 105 IBU's from Stone Ruination IPA clone in Zymurgy July/August 2012?

The recipe is:

12.5 lb two row
12 oz 15L
1.75 oz Columbus at -90
1.0 oz Centennial at 0
2.5 oz Centennial dry hop

Brewpal calculates it as: 47 IBU
 





Online a10t2

  • Official Poobah of No Life.
  • *
  • Posts: 3165
  • Ask me why I don't like Chico!
    • View Profile
    • SeanTerrill.com
Whose utilization correlation are you using? Tinseth, for example, comes out at ~85 IBU (22% utilization) and Rager at ~125 IBU (32% utilization). Off the top of my head, I don't remember which Zymurgy uses, and they could just be reporting the value they got from Stone.
Beer is like porn. You can buy it, but it's more fun to make your own.
http://seanterrill.com/category/brewing/

Offline morticaixavier

  • Official Poobah of No Life.
  • *
  • Posts: 5689
  • Davis, CA
    • View Profile
    • The Best Artist in the WORLD!!!!!
Also do they specify the %AA on those hops? that varies from farm to farm and year to year. alot of brewers, I beleive, adjust the recipe based on that from batch to batch.
"Creativity is the residue of wasted time" - A. Einstein

Jonathan I Fuller

Offline amahl2442

  • 1st Kit
  • *
  • Posts: 2
    • View Profile
I used ProMash at 75% efficiency. For 5 gallons:

12.5 lb two row
12 oz 15L
1.75 oz Columbus, FWH (15% aa)
1.0 oz Centennial at 0
2.5 oz Centennial dry hop

It gave me 105.1 IBUs total, 1.071 SG.

These are all estimates, as you know. Not sure who's brewing software is the most accurate at calculating bitterness, but we've gotten a lot of questions similar to yours, so obviously there's a lot of variation.

Cheers,

Amahl Turczyn Scheppach

Offline denny

  • Administrator
  • I must live here
  • *****
  • Posts: 11670
  • Noti OR [1991.4, 287.6deg] AR
    • View Profile
    • Dennybrew
I used ProMash at 75% efficiency. For 5 gallons:

12.5 lb two row
12 oz 15L
1.75 oz Columbus, FWH (15% aa)
1.0 oz Centennial at 0
2.5 oz Centennial dry hop

It gave me 105.1 IBUs total, 1.071 SG.

These are all estimates, as you know. Not sure who's brewing software is the most accurate at calculating bitterness, but we've gotten a lot of questions similar to yours, so obviously there's a lot of variation.

Cheers,

Amahl Turczyn Scheppach

Which formula do you use?
Life begins at 60.....1.060, that is!

www.dennybrew.com

The best, sharpest, funniest, weirdest and most knowledgable minds in home brewing contribute on the AHA forum. - Alewyfe