Recalculating Hops

[mrrm1st]

I am planning a partial extract brew this weekend following an IPA recipe from a clone brew book.

The hops are Warrier 8%, Amarillo and Simcoe. The Warrior is added on its own for the full 60 mins boil. Then after 30 mins all three hops are added together in equal quantities and again with 15, 10, 5 and 2 mins of the boil remaining.

Unfortunately, I couldn't find warrior hops in the UK, so I have settled for Chinook 12%. Instead of adding 1oz at the start of the boil (which is what the recipe requires for warrior 8%) I gather I only need to add 0.67 oz to achieve the right bitterness (8 HBU's).

My question is - should I chuck in the same weight of Chinook per the recipe for the 30 min etc additions, or do I also need to scale it down to take into account the higher alpha acid level? For the late additions I presume I can whack in the recipe weight, but the 30 mins addition worries me slightly. The only addition which specifies HBU's is the first 60 mins addition.

Help gratefully received!

[Spikesdad]

Try here...http://www.brupaks.com/BRUPAKS%20HOP%20 ... 202005.htm
Hope it helps, dave

[floydmeddler]

Yes, you should scale everything down unless you're adding after the boil.

[mrrm1st]

Thanks for the replies. I will scale down the recipe additions for Warrior to take account of the Chinook replacement.

In the recipe neither the Amarillo or Simcoe hops alpha acids (or HBU's) are mentioned (although neither are included for the full boil). Given the variation in alpha acids in different years crops do you just cross your fingers and hope the aroma and flavour hop additions aren't much different from those in the original recipe?

Thanks - Rich