Hey everyone. So I'm looking at a recipe for a Mosaic IPA and was looking at the hop schedule and came across varying "AAU's" in the hop schedule. For example: 2.0 AAU Mosaic hops (1.0 oz of 12% AA) 75 minutes 9.0 AAU Mosaic hops (.75 oz of 12% AA) 30 minutes 12.0 AAU Mosaic hops (1 oz of 12% AA) 0 minutes Can some explain what the difference between 2/9/12 AAU's are?
http://www.howtobrew.com/section1/chapter5-4.html "AAUs are a good way to state hop additions in your recipes. By specifying the amount of alpha acid for each addition, rather than e.g. 2 oz of Cascade, you don't have to worry about year to year variation in the hop. An AAU is equal to the % AA multiplied by the weight in ounces. For Example: 1.5 oz of Cascade at 5% alpha acid is 7.5 AAUs. If next year the alpha acid percentage in Cascade is 7.5%, you would only need 1 oz rather than 1.5 oz to arrive at the same bitterness contribution." It's a simple way to relate to a recipe that works no matter the differences in crop's AA's. Much like when we all share a recipe and do it in percentages like 85% Pale Malt, 5% C-40, 10% Wheat, instead of pounds.
First there is a typo on the bittering addition: 2.0 AAU Mosaic hops (1.0 oz of 12% AA) 75 minutes 9.0 AAU Mosaic hops (.75 oz of 12% AA) 30 minutes 12.0 AAU Mosaic hops (1 oz of 12% AA) 0 minutes The value of AAUs for the bittering (75 minutes) should be 12. “Can some explain what the difference between 2/9/12 AAU's are?” So, it really should be 12/9/12. In case you don’t know what AAU (Alpha Acid Units) are, they are the AA% of a given hop batch x the amount of hops in ounces 1 ounce of 12% AA hops = 12 AAU 0.75 ounces of 12% AA hops = 9 AAU (0.75 x 12 = 9) 2 ounces of 12% AA hops = 24 AAU Does this make sense? Cheers!
Ahhh yes! There is a typo in the magazine, the 2.0 AAU for 1 oz and then 12 AAU for 1 oz was what was throwing me off. Makes sense now thanks guys.
