Thanks Bob & others for your comments.
My ultimate goal is to use BS to guide me on water additions - so getting the water volume is paramount.
I've written a spread sheet that inputs grain pounds + intended volume into fermenter + grain absorption + boil volume loss + hops absorption + shrinkage, and computes mash total water volume required.
I've been able to adjust BIAB grain absorption within BS to match my spreadsheet calculations.
I've also created a table informing me as to deadspace based on volume of mash water, so for example at a computed mash water volume of 16.5G, i'll have 4.5G of deadspace within the clawhammer 20G kettle.
I can follow BS adjustments to Mash Volume Needed based on various Tun Deadspace inputs. - it does look like BS adjusts Mash Volume Needed regardless of whether i've checked the box for Adjust Mast Volume for deadspace.
I'd expect the Sparge Vol field to update based on my inputs, but does not????
Based on the 40.6 lbs grains, 4.5G deadspace & 10G fermentation BS computes Mash Vol = 24.6G. my own calcs. show that only 16.5G is required for mash volume, i have to assume that BS uses a much higher Water to Grist ratio than i use ???? thoughts?
One last question:
the clawhammer equipment profile lists the kettle volume at 20G - since there is a full gallon of additional space within the kettle, is there any reason i couldn't modify the profile with the 21G figure?
Thanks Again,
Craig