I attribute it to temp loss in a cooler, the amount of time lautered wort stays at mash temp, the inability to do a thorough mashout. This is all compared to my rims system and beersmith (and I already know how you feel about brewing calculator estimations). But by upping about 2deg when batch sparging I hit my numbers the same both ways.
pretty consistent with what i’d expect an all basemalt FG.
If you want to stick with all MO, try 158df mash temp as Kyle suggested above. I’d expect a little less attenuation. If you are fly sparging, are you raising to mashout before sparging? Just checking as if not, the extra 45-60min at mash temps could make your wort more fermentable.
If you want to use some crystal, which I personally would prefer for some flavor complexity, I would actually start at 7% of a medium (15-45L) crystal, and keep your mid range mash temp. Then if its too much, rachet down to 5% next time or up to 10% if you still want more.
I batch sparge, so I don’t raise up to mash-out temps. I’m going to try the middle of the road approach with the Crystal and then go from there. Of course, now that will be later this summer before I get an opportunity to brew again. I’m in the Navy and I’ll be going away for a bit and visiting a hotter climate. Thanks for all the help and suggestions!
From what you’re saying, you’d need to raise mash temp a little when fly sparging with a cooler. What you’re saying makes sense, but it’s not batch vs fly sparging. You’re really comparing RIMS vs infusion mash. Right?
I suppose so. I haven’t fly sparged with the cooler in years. So for an infusion mash with out the ability to heat as the runnings go in the boil kettle I would up 2 degrees to start with, to match software estimations and my rims setup.
I guess it depends if you want the Carmel malt character/sweetness in your beer (excluding carapils which don’t add much flavor). The ester profile has a lot to do with the body as well, so pitching rates, fermentation temp and yeast strain can make a big difference on the body. Take care in that hotter climate.