Hi there blancasterb,
As Lylo noticed, you have done a great job on the sheet. There's a few problems though...
Do not over-ride BIABacus auto-efficiency.
1. As Lylo mentioned, putting the opriginal recipes "efficiecny" into Section X is a mistake and you probably just read a post and misinterpereted that bit. Occasionally we will use the original recipe's "efficiecny" as a means of detecting what the original author meant in a poorly written/worded recipe.
The long and short of it is that someone else's "Efficiecny"whetehr it be a kettle or fermentor efficiency will not be the same as yours unless you have exactly the same equipment and brew the same way.
The BIABacus actually negates the need for you to actually know anything about efficiency because it works it out for you.
Let's delete the 75% in Section X. You'll see that the estimated kettle efficiencies have dropped from 75% to 59% and the required grain bill has jumped from 13524 grams to 17180 grams.
You'll also see a red warning pop up in Section A and V saying
Recipe won't work! You are out of bounds!
Why is this happening and how do we fix it?
Handling high gravity brews.
The BIAbacus is throwing a warning above because basically your mash is far too thick. Obviously if you put a drop of water onto a cup of oats, you won't be eating porridge. While that is an exaggeration, we do need a reasonable liquor to grain ratio to make a mash worthwhile.
There are two ways around the above.
The first is to use a 90 minute boil and just supplement the brew with extract/sugar however if you want a pure all-grain high gravity brew, the only way to increase the amount of water contacting the grist is to extend the boil time and that is what the craft breweries do.
Lets increase your boil time to 180 minutes. Here's what happens...
1. We lose the warning.
2. The kettle efficiencies in Section P rise from 59% to 67.3%.
3. The TWN in Section K rises.
4. The grain bill required drops from 17180 grams to 15078 grams.
Some further notes.
I've actually written a lot on high gravity brews this year so I would take some time to do abit of study as this is really a very extreme brew. Do an Advanced Search of posts done by me with the phrase "high gravity".
For example...
I'm worried that the auto-efficiency on such a high gravity brew is still too high. You may have to over-ride the percentage a bit. Read
this post.
This thread is a study of someone else's high gravity brew but that was only a tiny 1.080
. In that thread though you will learn a tiny bit about "gravity points". ANother advanced search of my posts should come up with a fuller explanation. You want to be knowledgeable about these before your brew day so as you can play around with your boil time to get the right OG. (You may or may not get the volume you are after. That will depend on how good the auto-estimates is).
Evaporation rate varies from brew day to brew day. With a 180 minute boil, you will have time to take a few volume readings and estimate the evap rate on that day. YOu will be able to manipulate the boil time to ensure you end up with the right OG. Treat gravity as your primary concern, not volume. You will get what you get on the volume - more if you are lucky, less more likely.
We really need numbers on massive brews like this so do your best to record some volume and gravity sets for us.
PP
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