Originally Posted by dbrewski
I read a Brew you Own article on Partigyle (google it). The thing I found interesting was that about half the gravity came out of the first third of the batch volume, then the other half was in the second two-thirds of volume. So judging from this, let's say your grain bill is for a 10 gal. batch. He's saying basically the strong beer would be the first 3.5 gallons of runnings, the small beer would be the final 6.5 gallons. That way even your small beer has a reasonable gravity to start with. I realize this doesn't match your plans exactly, but it was an interesting way of thinking about it.
[Edit] Here it is, it's not BYO after all:
Dbrewski, is right. Your first runnings, when batch sparging, would be the xxx beer. The second runnings would be the xx beer. If you started with a large enough grain bill, you're third runnings would be your x beer.
I don't have two kettles to run simultaneously, so I remember making a russian imperial stout and oatmeal stout back to back took up most of my Saturday. In my case I added flaked oats the mash after my first runnings.
Running a full batch off your grains and then sparging them again for a lightly colored, tasteless, < 1.010 beer is just gonna result in a tanniny beer. Even if you top off with DME.