I am planning on doing eds Haus Ale on thursday, I will be doing 10 gallons, my question is I have some 9.1 aau centennial and 5.1 aau cascade, the recipe calls for 6.6 aau cascades, if i USE 1 OZ. 9.1 aau centennial and 1 oz. 5.1 cascade for the bittering hops will I be off target too much, I am assumiong I will lose a bit on effeciency with the larger grain bill, should I up the 2 row a bit, any suggestions welcome, thanks.
Okay so here is ed's hopping schedule:
Boil & Hops
1.0 oz Cascade 6.6% at 60 min.
0.5 oz. Cascade 6.6% at 30 min.
0.25 oz. Cascade 6.6% at 15 min.
0.25 oz. Cascade 6.6% at 5 min.
So assuming that when you say 9.1aau centennial you mean the centennial hops you have are 9.1% alpha acids...just for clarification aau and alpha acid percentages are different. {aau = (aa%) * (weight in oz) } We can adjust his hopping schedule to adjust for what you have. Basically you want to keep the aau (alpha acid units) constant. The first thing we need to do is find out how many aaus ed is adding at each hop addition:
1oz * 6.6 %aa = 6.6 aau @ 60min
0.5oz * 6.6 %aa = 3.3 aau @ 30 min
0.25oz * 6.6 %aa = 1.65 aau @ 15min
0.25oz * 6.6 %aa = 1.65 aau @ 15min
##all are cascade additions##
so now that we know the aaus added at each point in the boil, we can adjust for what you have. We take the alpha acid units in the recipe and divide by th e % alpha acid of the hops that you have in order to determine the weight of each hop addition. This can be seen below:
6.6 aau / 9.1 %aa = 0.725oz Centennial @ 60 min
3.3 aau / 5.1 %aa = 0.64oz Cascade @ 30 min
1.65 aau / 5.1 %aa = 0.32oz Cascade @ 15 min
1.65 aau / 5.1 %aa = 0.32oz Cascade @ 5 min
So what you will need to make a close clone is 0.73oz centennial and 1.28oz cascade. If you don't have that much cascade, and only have 1 oz... you could use this hopping schedule:
0.725oz Centennial @ 60 min
0.16oz Centennial @ 30 min
0.36oz Cascade @ 30 min
0.32oz Cascade @ 15 min
0.32oz Cascade @ 5 min
This new schedule allows for what you have and will keep the aau constant for each addition. This may change the flavor slightly since you are adding centennial at 30 min but not too much because it IS still going to boil for 30 min... OR if you aren't too concerned with the IBUs being off too much I would just add the cascade like he did 0.5 @ 30, 0.25 at 15, 0.25 @ 5, and just change the amount of centennial being added @ 60 min to the new value of 0.8. This will also work fairly well.