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Misledgnome

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HI all, I am returning to brewing after a 30 year gap, and realised I have forgot almost everything, so looking forward delving into you vast reservoir of knowledge.

I have just put the lid on a Coopers Extra Stout I saw online, SG 1.054, and pitched the yeast at 18 degrees, what time period should I look at for full fermentation and what temperature would you expect the brew to raise to naturally. Is it true that Stouts with higher alcohol content are better left at the lower end of the margin? A bit rusty in my knowledge. I have it in the utility room which has an average air temperature of just over 18 degrees, thanks for any input looking forward to much more on this forum.

Recipe:

Coopers 1.7Kg Stout

Heart of England 1.5Kg Extra Dark LME

Brewers Sugar 500g

Mangrove Jacks Yeast new world Strong Ale Yeast - M42

I am aiming for a Stout around the 6.5 - 6.8% mark any tips would be much appreciated.
 
Last edited by a moderator:
Hi there! Welcome back to Homebrew.
To get 6.3% in a 23L brew you need over 85% attenuation. M42 may not get past 82%, so realistically you will be lucky to get 6%. You could add more sugar and I made plenty of stouts using 1.7kg and 1.5kg stout kits with a whole kg of sugar and thy were all very good. As a rule of thumb, 500g in 25L gets you another 1% ABV. 300g would get you there or thereabouts on that basis.
 
Thanks Slid, what I didn't mention was that the M42 was on top of the Coopers yeast with the stout kit, would this not get me the right amount of cells to attain that? or am i getting mixed up?
 
My understanding is that it not the cell count that is the limiting factor in this case it is the attenuation capability of the yeast, which, for the MJ42 yeast is more typically around 80% not the 85%+ you are currently trying to achieve with your current OG. So the solution as @Slid has suggested is to elevate the OG.
If you punch a few numbers into this calculator (which I usually find is accurate for kits and extract brews)
https://www.brewersfriend.com/homebrew/recipe/calculator/
your current ingredients equate to a 21 litre brew at OG 1.054, and, using the data for the M42 yeast, if you add a further 300g dextrose as @Slid suggested that will give an OG of 1.059, a target FG of 1.009, and an ABV of about 6.5-6.6%, which is in the range you are looking for.
 

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