Hi
I've been reading a bit of Palmer about calculating the likely OG of a brew manually, by adding up the the extract potential of each of the grains in the recipe. Not sure I have it right and I'd appreciate some feedback. This is what I have so far;
Sugar, being 100% fermentable, will contribute 46 gravity points. That's like 'a given', and the extract potential of each grain is indexed off that. Once you have your extract potential you then just factor in grain weight, efficiency and batch volume.
To use an example - How many gravity points will 2Kg of BB Galaxy (extract potential of 77.1% less 4.5% moisture) contribute to a 25L batch, assuming 70% efficiency......my calcs go like this;
46 (sugar base) x .726 (ext pot of BBG) x .7 (effic) x 2 (grain wgt) / 25 (batch vol) = 1.87
Does this mean that my 2Kg of BBG adds 18.7 (say 19) points to my OG??
How am I going??? I'd appreciate yor help...
I've been reading a bit of Palmer about calculating the likely OG of a brew manually, by adding up the the extract potential of each of the grains in the recipe. Not sure I have it right and I'd appreciate some feedback. This is what I have so far;
Sugar, being 100% fermentable, will contribute 46 gravity points. That's like 'a given', and the extract potential of each grain is indexed off that. Once you have your extract potential you then just factor in grain weight, efficiency and batch volume.
To use an example - How many gravity points will 2Kg of BB Galaxy (extract potential of 77.1% less 4.5% moisture) contribute to a 25L batch, assuming 70% efficiency......my calcs go like this;
46 (sugar base) x .726 (ext pot of BBG) x .7 (effic) x 2 (grain wgt) / 25 (batch vol) = 1.87
Does this mean that my 2Kg of BBG adds 18.7 (say 19) points to my OG??
How am I going??? I'd appreciate yor help...