Dogfish Head 60 Minute IPA recipe

[stadelman]

I'm looking to brew a beer like Dogfish Head's 60 minute IPA.

I've found the following extract recipe (see below). This recipe is supposedly from Sam Calagione's book Extreme Brewing.

I plugged this recipe into Beer Smith and the IBUs are not adding up. You are supposed to mix the Amarillo, Simcoe and Warrior (a total of 1.5 ounces) and then continually add these hops over the 60 minute boil. I entered .05 oz additions of each hop every 6 minutes in Beer Smith. It calculates 45 IBUs. This needs to be around 60 IBUs.

After I get this figured out, I'm going to convert it to an AG recipe.

Is Beer Smith just not calculating this correctly?



Pre-boil tea at 150°F (66°C)
6 gallons (23 L) water
Grain bag
6 ounces (75 g) crushed British
amber malt


Boil
7 pounds (3.2kg) light dry malt extract
(75 minutes)

1/2 ounce (15g) Warrior hops
(Add gradually over 60 minutes)

1/2 ounce (15g) Simcoe hops
(Add gradually over 60 minutes)

1/2 ounces (55g) Amarillo hops
(Add gradually over 60 minutes)

1/2 ounces (55g) Amarillo hops
(End of boil)

Fermentation
Yeast: Wyeast 1187 Ringwood Ale

1 ounce (55g) Amarillo hops
(6 to 7 days)

1/2 ounce (15g) Simcoe hops
(6 to 7 days)

Bottling
5 ounces (125g) priming sugar

STARTING GRAVITY: 1.064
FINAL GRAVITY: 1.017
FINAL TARGET ABV: 6%
IBUs: 60

[Sent From My iPhone]

You can't simply go by the amount given in teh recipe, in this case 1/2 oz of each. It's going to depend on the alpha acids of the hops. That will determine the amount of hops to add.

[stadelman]

Good point.

My assumption was that Beer Smith uses average figures for alpha acids and that using average numbers, I should be in the ballpark, but the calculation is off by 25%. That seems to be a different ballpark altogether to me.

[stadelman]

I just modified the recipe by removing all of the 6 minute hop additions. I added all of those three hops at 60 minutes.

.5 ounces Warrior (60 minutes)
.5 ounces Simcoe (60 minutes)
.5 ounces Amarillo (60 minutes)
.5 ounces Amarillo (0 minutes)
1 ounce Amarillo (dry hop)
.5 ounces Simcoe (dry hop)

So, no "continually added" hops at all. The calculated IBUs for this is 60.7.

So, to me, there is no way that spreading this 1.5 ounces of hops across 60 minutes is going to come close to 60 IBUs.

Am I missing something here?

[jeffbones]

Your not going to get what your looking for if you dump all of them in at 60 min. You will need to adjust the amount of hops you are "continually adding" to get you at the right IBUS. Set the program (beersmith,promash what ever) to the AA of the hops you have and adjust accordingly.

[cmgray]

It also could have something to do with the formula used to calculate the IBU's. (Rager, Tinseth, etc.) If the recipe source doesn't specify it, then try changing to different ones in beer smith and see if you get different results. Of course it won't change what's in the beer, just what the computed number (estimate) means.