James Squire IPA - Partial mash recipe

[Trough Lolly]

G'day all - the other day, I was asked if I knew of a partial mash recipe for James Squire IPA. I must confess that I have brewed partial IPA's and they were more closely aligned to a traditional English IPA rather than the JS IPA, but with some hop schedule adjustments, I think we'll get pretty close - but my recipe won't have those cooked vegetable DMS aroma notes that I always detect when I open a bottle of this very nice beer....

So, here's the basic partial / mini mash recipe to kick off with (image courtesy of ratebeer.com):



Trough Lolly's James Squire IPA - Partial mash recipe
Batch Size = 23L
OG = 1.061 (assumes 70% mash efficiency)
Estimated IBU's = 40 IBU
Boil volume = at least 10L

Grain / Extract Bill
1 x Coopers Real Ale kit
1kg Coopers Light DME
1.5kg Pale ale malt (Mariss Otter preferably)
1kg Munich malt
300g Light Crystal malt
200g Amber malt

Hop Schedule
20g EK Goldings 5% A/A 30 mins
20g Cascade 6% A/A 15 mins
20g Fuggles (aroma/dry hop)

Yeast
US-05 (I do recommend Wyeast 1028 London Ale yeast if you have it!!)

Notes: There are many ways to make a decent IPA - holding back on ingredients isn't one of them!! I've also made partial IPA's with Chinook for bittering and they're quite nice. My partial mash instructions may be helpful when you decide to make this beer. To get decent bittering from the hops, only boil the extract from the grains in 10 litres of water for an hour - add the kilo of DME with 10 mins to go in the boil if you must, otherwise the gravity of the boil will be so high that the hops will not deliver sufficient bitterness. As always, add the kit to the fermenter when you add the chilled post-boil wort.

All grain version - last brewed on 27 Jan 08...
Batch Size = 21L
OG = 1.060 (75% efficiency)
FG = 1.012 (6.2% Alc by Vol.)
Expected IBU's = 54

3.5kg Pale ale malt (Mariss Otter if you can)
1kg Munich I
300g Crystal 40L
250g Bairds Amber malt
70g Roasted Barley
48g Goldings 7% A/A for 60 mins
12g Cascade 6% A/A for 20 mins
20g Fuggles (dry / aroma hop)
Wyeast 1056 Chico Ale strain

Cheers,
TL

Edit: Corrected bittering levels...and abv value!

[jel]

Hi TL,

Thanks for yet another fine partial/mini mash recipe. I have added it to the (ever expanding) list of future brews.

One question i have, is in regards to the hop schedule, when using a pre-hopped kit can in the recipe.

[warning: convoluted question to follow]

Let me start by mentioning some of the (limited) understandings/assumptions I have. I understand that there are a lot of provisos with the following but I need a simple place to start from.

Pre-hopped Kit IBU's
My understanding is that a Kit (for arguments sake, say Coopers Lager) is bittered so that if a final gravity of say 1.040 is achieved, you will end up with 21 IBU. Now if that final gravity is higher than that, the bitterness level will differ. If you increase the fermentables, it will be less bitter, but if you reduce the volume (and change nothing else) it will be more bitter. Am I close?

Hop utilisation in partial boils
Okay, so assuming that my boil gravity is basically the same as my final gravity, if I add enough hops to achieve a desired bitterness level, then when i add everything to the fermenter (assuming the other fermentables are not hopped) my final bitterness level will be the same as it was for the 'boiled/hopped' liquid?

So basically what I am asking is, if all gravities remain constant, then when using a pre-hopped kit, my final IBU's will be, boiled wort IBU + kit IBU.
Is this assumption correct (or even close enough for ballpark figures?)

The reason that I ask, is that using my rough calculations, and assuming a boil gravity of nom. 1.050, for the above hop additions, i get roughly:

30g Northern Brewer 7.4% A/A 60 mins - 28 IBU
20g EK Goldings 5% A/A 30 mins - 9 IBU
20g Cascade 6% A/A 15 mins - 7 IBU

which gives me a total of 44 IBU, which if I then add the kits IBU, I get roughly 65 IBU ....

So is there something fundamental missing in how I am approaching this?

Sorry for the essay.

Anyways, have a great easter break all.
Cheers
Jon

[earle]

Hi Jon

IBU is a measurement of concentration so in terms of Kit bitterness only changing the volume will change the IBU bitterness. The fermentable sugars in malt are converted to alcohol, however the non-fermentable bits (why malt is better than dex) affect the flavour and sweetness of your brew. This is why if you have 2 brews of the same IBU, the one with more malt will have a lower percieved bitterness.

BTW I assume you mean original gravity of 1.040. Original gravity is when you've mixed everything up, final gravity is after fermentation.

In terms of partial boils I think you have the right idea. Use your final volume and its original gravity to calculate hop utilisation. Do a partial boil to get the same hop utilisation and then add the rest of your fermentables and water to achieve the desired IBU. (The partial boil will have all the bitterness but in a smaller volume so is more bitter than your final wort, when you dilute it you come back down to your calculated IBU.)

I checked your hop utilization using
http://www.grainandgrape.com.au/Calcula ... p_calc.htm
and get slightly higher calcuated IBU but I reckon you're definitely on the right track.

Earle

[jel]

Hi Earle,

Thanks for the confirmation that i wasnt too far off track.

Sorry about the mix-up with the wording on original and final gravity. Thats the danger mixing forums and work hours - it often leads to a mixing of terminology.

So basically, if I were to follow TL's recipe and hop schedule, I should really be adding a can of un-hopped malt extract, rather than a can of Coopers Lager/Real Ale etc. Conversely, if I were to use a hopped can, I should cut back on the bittering hops. Something along the lines of:

Desired IBU - 45
Lager Kit IBU - 21
30g EK Goldings 5% A/A 30 mins - 13.5 IBU
30g Cascade 6% A/A 15 mins - 10.5 IBU

Jon

[Trough Lolly]

Hi Earle,

Thanks for the confirmation that i wasnt too far off track.

Sorry about the mix-up with the wording on original and final gravity. Thats the danger mixing forums and work hours - it often leads to a mixing of terminology.

So basically, if I were to follow TL's recipe and hop schedule, I should really be adding a can of un-hopped malt extract, rather than a can of Coopers Lager/Real Ale etc. Conversely, if I were to use a hopped can, I should cut back on the bittering hops. Something along the lines of:

Desired IBU - 45
Lager Kit IBU - 21
30g EK Goldings 5% A/A 30 mins - 13.5 IBU
30g Cascade 6% A/A 15 mins - 10.5 IBU

Jon

Hi Jon,
Yes, your logic is sound - and had me diving back into my brewday logbook! My hopping schedule when I did this brew in October 2005, was:

14g Chinook 15.3% A/A 60 mins
28g Northern Brewer 7.4% A/A 60 mins
18g EK Goldings 7% A/A 30 mins
16g EK Goldings 7% A/A 20 mins
20g Cascade 6.3% A/A 2 mins
...and I added the Coopers Real Ale kit at flameout!!

Now whilst that looks like a $hitload of hops, the important thing I noted in the recipe is how I boiled the wort. I did a concentrated wort boil which means my bittering efficiency calcs would have been way down - and hence the large hop schedule. So, yes, if you have the opportunity to do a full boil or two stock pots, etc, then yes, you need to pull down the quantities to the levels you suggest. Thanks for pointing that out to me! I'll do some more calcs and edit the above recipe to avoid over bittering the brew - which I personally find hard to do with an IPA!

Cheers,
TL

[Kevnlis]

Too much bitterness? Surely you jest!

http://craftbrewer.com.au/brewing-pages.asp?NewsID=23

I had the 100 IBU grand daddy of this beast and it was excellent! I will some day grow the balls to tackle this recipe... I think...

[Trough Lolly]

Indeed! 100IBU ales are fine...Ross's hop monsters are a treat! I can't afford that much hops unless they're off my own bines.

I found the glitch - I had an unnecessary bittering addition (28g of NB) that had incorrectly been carried over from another AG variant. The original post has been modified - thanks again to Jon for the reality check!

Cheers,
TL

[jel]

Thanks TL,

Good to know some of what I have been reading lately has sunk in

OT/ I finished my first partial on the weekend using your SNPA recipe as a guide. Tasted great going into the fermenter, although my efficiencies were lousy and the kitchen stove was really struggling with a 13 litre boil ... i can also see that i will quickly tire of the mess I made of ladling the grains via a sieve. Oh well, better start saving for some decent equipment!

Cheers
Jon

[drsmurto]

Punched this into beersmith cos it looks like a dead set winter winner (and its feels like winter here today!).

With OG 1.060 and FG 1.012 i get an abv of 6.2 not 5.2. Which is what i want from a 'traditional' english IPA......

Spending far too much time the past week chopping and changing recipes after reading others and then adding bits. Some of the recipes are going above my 5 malt limit!

Anyway, cheers for the recipe TL. The AG version will be brewed very soon!

[Trough Lolly]

Bloody hell, so it is! Ok, either I'm too pissed to read Promash or somethings up the clacker...!

I'd suspect it's me!

[Paleman]

Thanks for the recipe TL.

This will be my next beer, looks big and delicious.

Now to track down some grains.

[Trough Lolly]

No worries Paleman - glad to be of help!

I made a few sampler bottles when I kegged this beer about 4 weeks ago. It tasted surprisingly good! The strong malt and alcohol profiles were well balanced by the hops. This batch turned out much better than I expected and the amber malt addition gave a very nice toasted, biscuity flavour to the beer that works very well with the other grains.

The next time I make this beer, I'll use an English Ale strain and try using Target or Northdown as a flavouring addition instead of the Cascade. Highly recommended!

Cheers,
TL

[Timmsy]

Had a glass of this today after been in the keg since Sat. Real nice drop. Nice color and flavor. Not to bitter but JSIPA isnt all that bitter. Really nice. Well try this again for sure. Maybe bitter it up abit more to try something different

[Bizier]

Has anyone had any experience with Galaxy?

TL, you mentioned and IPA with Chinook, which these are reputedly close to - I got some with an alpha of 15% from craftbrewer, and I was considering them for a IPA loosely derived from this recipe - though grain will be different, I only have smaller QTYs - I can see that I will need much larger amounts next time.

[Kevnlis]

Galaxy the hop or malt?

If you mean the hop, no one really has any experience with it, this is the first season we have been able to get it

[Bizier]

Sweet - this will be by first brew to garner a name: "Galaxy Frontier IPA"

[Trough Lolly]

Sweet - this will be by first brew to garner a name: "Galaxy Frontier IPA"

...as long as it's not the final frontier!!