Archive for January, 2015

AG#27 – Jaipurish India Pale Ale

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I’ve long been a fan of Thornbridge’s Jaipur. Though it’s brewed by an English brewery, it’s very much an American style IPA, though perhaps not as strong as most IPA. It comes in at 5.9% ABV, but delivers a lovely hoppy punch – grapefruit rind with a little pine. I’ve always liked it because it’s very crisp and drinkable. I decided to attempt a clone version of the beer because I have some WLP810 yeast slurry left over from a previous batch. It might seem odd to be using a lager strain for this beer, but I read some comments on JBK that point to WLP810 (the Anchor Brewing strain) as the yeast Thornbridge uses for this beer. The only way I’ll know is to give it a try. for the grain bill, I’ll be using Mitch Steele’s recipe taken from his “IPA” book. Mitch specifies 96% pale malt and 4% Vienna malt. I’ll be using 4% Vienna, 4% wheat and 92% pale malt. I’ll also be using the hop varieties reported to be in Jaipur – Ahtanum, Centennial and Chinook. I’ll be using lots of Ahtanum and Centennial but keep the Chinook addition(s) quite restrained, as Chinook can be quite pungent and I don’t want it to overwhelm the more delicate Ahtanum. I doubt by beer will be as pale as Jaipur, but I hope so.

Recipe Specifications

Boil Size: 27.92 l
Post Boil Volume: 23.92 l
Batch Size (fermenter): 19.00 l
Bottling Volume: 17.00 l
Estimated OG: 1.056 SG
Estimated Color: 10.1 EBC
Estimated IBU: 55.9 IBUs
Brewhouse Efficiency: 60.00 %
Est Mash Efficiency: 72.6 %
Boil Time: 60 Minutes

Ingredients

5.166 kg Pale Malt, Maris Otter (5.9 EBC), 92.0 %
0.225 kg Vienna Malt (6.9 EBC), 4.0 %
0.225 kg Wheat Malt, Bel (3.9 EBC), 4.0 %
24 g Chinook [13.00 %] – Boil 60.0 min, 44.6 IBUs
0.50 Items Whirlfloc Tablet (Boil 10.0 mins)
25 g Ahtanum [6.00 %] – Boil 10.0 min, 4.2 IBUs
25 g Centennial [10.00 %] – Boil 10.0 min, 7.0 IBUs
50 g Ahtanum [6.00 %] – Boil 0.0 min, 0.0 IBUs
50 g Centennial [11.00 %] – Boil 0.0 min, 0.0 IBUs
25 g Chinook [13.00 %] – Boil 0.0 min, 0.0 IBUs
1.0 pkg WLP810 (400ml slurry from Union Square)

Mash Schedule: Bubbles’ Single Infusion, Full Body, Batch Sparge

Total Grain Weight: 5.616 kg
Mash In           Add 15.72 l of water at 74.6 C          68.0 C        60 min

Sparge: Batch sparge with 2 steps (Drain mash tun , 18.32l) of 77.0 C water

Notes

26/01/2015 – Made a couple of boo-boo’s.. First of all I decided to add more hops at the last minute, but instead of adding them to the flameout bowl as intended, I added them to the 10-min bowl. I couldn’t accurately remove them as there were different hop varieties in the bowl so I just left them in. Beer will have a bit more bitterness than the 56 IBU above suggests. I also completely forgot to take a gravity reading. Used hop bags for all the additions, even the bittering addition, and I got a good run off from the boiler. I might have to do this again. I’ve a horrible feeling my dial thermometer is not accurate, it was measuring 20C before I ran off from boiler, but the hop bags I removed from boiler had beer in them that felt distinctly warm. Were the hop bags insulating warm beer inside them? Must calibrate the thermometer before I use it again. Pitched yeast mid-morning and fermentation was going by evening.

Also, I was adding some cold water to the strike water to take the temperature down, but I overcooked it. When I doughed in, the temperature of the mash was at 63-64C. Even I couldn’t ignore that mistake. So I added boiling water from the kettle to bring the temperature back up closer to 65C. Added an extra 25g of Ahtanum and increased the amount of Chinook to 40g because they smelt so fresh.

02/02/2015 – Weather is really cold at the moment, but this is still fermenting away. Still a steady stream of bubbles through the airlock.

16/02/2015 – Kegged the beer tonight and bottled a single bottle with 2 carb drops. Aroma is a bit sulphurous, but the sample tasted quite nice.


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