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Lightw8

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My most recent batch has me frustrated! I made a stout that's mostly extract with a few lbs of grains for flavor and body.
My OG was 1050 at around 70F and today I transferred to secondary after 10 days and current gravity is only 1040 at around 70F. This has me perplexed since the first 24 hours had intense enough fermentation to pop the airlock off the bucket and make a mess, then continued to ferment after I replaced the airlock.

I steeped 4 lbs of grains and sparged etc. The grains were crystal, chocolate, oats, roasted barley and crisp black. Given the grain choice and what was likely terrible attenuation my goal with the grains was flavor and body.
I added 9lbs of DME to a 2.5gal boil which produced a 5gal batch. According to most resources I've found that should've given me an OG of 1080 or so.

After seeing the low OG I tested my hydrometer against my water and got a reading of 1 so I'm very confused.
Also I tasted the batch after taking the gravity reading today and the flavor is indicative of more fermentation having happened. It's not the sugar water that such low fermentation would leave you with.

Any possible explanations would be helpful.
 
You likely didn't get an accurate OG reading since you topped off with water. If you are sure of the amount of DME and your end volume then you can just use the calculated OG as the correct one. As to why your beer has stalled at 1.040 I don't know. How much yeast did you pitch, did you aerate, what yeast and what temp?
 
1080 wort is going to take a big yeast pitch. Plus you dumped a good bit of stuff in there that isn't very fermentable (aside from the oats). If you used dark extract it's probably already got a lot of less fermentable stuff in it too.
 
You likely didn't get an accurate OG reading since you topped off with water. If you are sure of the amount of DME and your end volume then you can just use the calculated OG as the correct one. As to why your beer has stalled at 1.040 I don't know. How much yeast did you pitch, did you aerate, what yeast and what temp?
I pitched 2 packets of Safbrew S-33 at around 75F. Didn't aerate with a stone or anything but when I brought the batch up to 5 gallons I used the aerator (sprayer) from my sink to fill and gave it a vigorous stir during the fill.
Like I said previously, within the first 24 hours it over fermented and popped out the airlock but it did continue to ferment after that (but obviously not as vigorously)
 
1080 wort is going to take a big yeast pitch. Plus you dumped a good bit of stuff in there that isn't very fermentable (aside from the oats). If you used dark extract it's probably already got a lot of less fermentable stuff in it too.
Used 6lbs of a hopped amber DME and 3lbs of a dark. Pitched two packets of Safbrew S-33. Also, like I mentioned before, I wasn't expecting my fermentables to come from the grains and was relying on the DME for them.
 

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