Imperial IPA

[rosenjm]

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With the last batch happily bubbleing away in the fermentor, it is time to look towards the next batch. For this one, I plan on pushing the Electric Brewery a little. This recipe is based on DFH 90 min IPA. This is going to push grain weight (28.5#), total water and be the first time I've used it to perform a step mash.

The IBU calculations will be a little off as it is assuming all the hops is added at 90 min vice continiously added over the 90 min boil.

Love to hear your input/feedback.

Style: Imperial IPA
TYPE: All Grain

Recipe Specifications
--------------------------
Batch Size: 10.00 gal
Boil Size: 13.55 gal
Estimated OG: 20.000 Plato
Estimated Color: 10.5 SRM
Estimated IBU: 134.5 IBU
Brewhouse Efficiency: 80.00 %
Boil Time: 105 Minutes

Ingredients:
------------
Amount Item Type % or IBU
22.75 lb Pilsner (2 Row) Ger (2.0 SRM) Grain 79.82 %
5.75 lb Amber Malt (22.0 SRM) Grain 20.18 %
1.00 oz Amarillo Gold [10.00 %] (Dry Hop 3 days) Hops -
0.50 oz Magnum [14.00 %] (Dry Hop 3 days) Hops -
0.50 oz Simcoe [12.00 %] (Dry Hop 3 days) Hops -
2.00 oz Simcoe [12.20 %] (90 min) Hops 50.1 IBU
1.75 oz Magnum [14.10 %] (90 min) Hops 50.7 IBU
2.00 oz Amarillo Gold [8.20 %] (90 min) Hops 33.7 IBU
1 Pkgs Whitbread Ale (Wyeast Labs #1099) [StarterYeast-Ale


Mash Schedule: My Mash
Total Grain Weight: 28.50 lb
----------------------------
My Mash
Step Time Name Description Step Temp
10 min Protien Rest Add 8.84 gal of water and heat to 122.0 F
60 min Saccharification ReHeat to 149.0 F over 10 min 149.0 F
10 min Mash Out Heat to 168.0 F over 10 min 168.0 F


Notes:
------
Starting with 90 min. left in boil, begin slowly and evenly adding the hops to the kettle. (This works out to a about 0.48 oz of hops every 7.5 minutes.)


-------------------------------------------------------------------------------------

Water adjustments:


Starting Water (ppm):
Ca: 44
Mg: 13
Na: 58
Cl: 128
SO4: 10
HCO3: 77

Mash / Sparge Vol (gal): 8.91 / 7.93
RO or distilled %: 50% / 50%

Total Grain (lb): 28.5
Non-Roasted Spec. Grain: 0
Roasted Grain: 5.75
Beer Color (SRM): 10.5

Adjustments (grams) Mash / Boil Kettle:
CaSO4: 15 / 13.35016835
CaCl2: 0 / 0
MgSO4: 4 / 3.560044893
NaHCO3: 0 / 0
NaCl: 0 / 0
CaCO3: 0 / 0
Lactic Acid (ml): 6
Sauermalz (oz): 0

Mash Water / Total water (ppm):
Ca: 123 / 123
Mg: 18 / 18
Na: 29 / 29
Cl: 64 / 64
SO4: 299 / 299
Cl to SO4 Ratio: 0.21 / 0.21

Alkalinity (CaCO3): -177
RA: -275
Estimated pH: 5.26

[rosenjm]

Getting ready to brew this recipe today. Can't wait!

[kal]

Sounds tasty! The hops you're using work well together... it's the style that I like myself.

I've never had DFH90 but that seems like a lot of amber (20%). Is it really 10 SRM?

Your salt additions look good... looks like you're targetting Randy Moser's Ideal Pale Ale numbers which is what I'd do as well for something like this.

Nice low 149F mash temp too which is needed for a higher SG beer like this... you dont' want it overly sweet.

What's the estimated alc content? I see the SG is around 1.083.

I've never used WY1099 yeast but 80% attenuation should give you 1.017 which is 6.9%. If you get 75% then you'll end up at 1.021 which gives you 6.4%. IIRC DFH90 is 9% ABV no?

Kal

[kal]

Sounds tasty! The hops you're using work well together... it's the style that I like myself.

I've never had DFH90 but that seems like a lot of amber (20%). Is it really 10 SRM?

Your salt additions look good... looks like you're targetting Randy Moser's Ideal Pale Ale numbers which is what I'd do as well for something like this.

Nice low 149F mash temp too which is needed for a higher SG beer like this... you dont' want it overly sweet.

What's the estimated alc content? I see the SG is around 1.083.

I've never used WY1099 yeast but 80% attenuation should give you 1.017 which is 6.9%. If you get 75% then you'll end up at 1.021 which gives you 6.4%. IIRC DFH90 is 9% ABV no?

Kal

[rosenjm]

[kal]

Yup. Efficiency isn't really important at home brew levels. *Consistent* efficiency is, as that allows you to make what you expect to make.

Kal

[kal]

Yup. Efficiency isn't really important at home brew levels. *Consistent* efficiency is, as that allows you to make what you expect to make.

Kal

[JP]

DFH 90 is fantastic. IMO it's even better than the DHF 60 and as for being close to 9%, you can't taste the alcohol burn. I loved it, I am sure your clone will be perfect.

Good luck with it.

JP

[rosenjm]

This sucker has been bubbling almost constantly for about 36 hours with no end in sight. Blown through the airlocks twice, and that is with about 5" of head space in the top of the bucket. I know, I know, I should use a blow off tube. Problem is, that set-up is already in service. I guess we figured right with the yeast! Can't wait to see what kind of attenuation I get.

[coffeediver]

Rosenjm,

How did this DFH90 turn out?

[rosenjm]

Ended up with a FG of 4.89 brix for a 8%ABV. 7 days in primary @ 68F, 5 days in secondary dry hopped and 30 days bottle conditioned. All in all it is a very good beer. I'm not sure it is terribly close to the real thing, I have to get a bottle of DFH90 and try them side by side. I think it came out a bit too dry and could use a bit more body. The hop aroma is amazing, very citrusy. It is bitter, but not tooth enamel-eating bitter. I might experiment with adding some dextrin malt for body, and go for a longer, cooler fermentation.