What Changed?

[TWS]

Hello!
Am curious as to why the same recipe created in September and copied in December would show such different stats:
Recipe:
7 lb 2-row
6 oz Crystal 40
1 oz Chinook hop
1 oz Perle hop
2 oz Cascade hop (dry)
Yeast Safale US-05

Stats Sept 2019/Dec 2019
OG 1.038/1.054
FG 1.007/1.010
ABV 4.11%/5.87%
IBU 73.94/94.76
SRM 4.82/6.15

 

[Yooper]

I can’t open those- can you give me a link to the recipes so I can take a look?

 

[TWS]

Does this work for you?

 

[Yooper]

Does this work for you?

The efficiency in one recipe is 65% and in the other is 70%. That changes the boil gravity, the extraction, the OG, etc.

 

[Pricelessbrewing]

However the difference of 5 % is about 13-14 total gravity points, or ~2-3 SG for the batch size. It's not enough to explain the 16 SG difference.

 

[TWS]

I agree that the efficiency change will impact the calculated outcome, but not by as much as is indicated in the two recipe printouts.
Still wondering...

 

[Yooper]

IF you post a link to the recipe, I can look at it more in-depth. I can’t tell any thing else from the screenshots.

 

[TWS]

Be happy to with your help. Thought BeerXML could not figure out how to use a URL to access the link. Suggestions?

 

[Pricelessbrewing]

Be happy to with your help. Thought BeerXML could not figure out how to use a URL to access the link. Suggestions?

On the recipe editor, click the toggle for share recipe so your recipe is public, then copy and paste the URL from the browser.

 

[Yooper]

Be happy to with your help. Thought BeerXML could not figure out how to use a URL to access the link. Suggestions?

When you are looking at the recipe, click and highlight the address in the address box and copy it. Then paste it here in a message. Then I can see it, and figure out where the differences are.

 

[TWS]

Okay, here goes:
December recipe: https://www.brewersfriend.com/homebrew/recipe/view/927856/nb-sierra-madre-clone-ag-12292019
August recipe: https://www.brewersfriend.com/homebrew/recipe/view/879836/nb-sierra-madre-clone-ag-08182019

and thank you for your patient persistence in helping with my question...

 

[Pricelessbrewing]

I'm not seeing the 1.054 in either of those recipes, or in the brew sessions for those recipes.

They're all 1.034-1.038 which is within the efficiency differences in the two recipes.

The maximum potential of this grains is 7* 37 + 34 * 6/16 = 271 points.

271 * 0.70 (efficiency) = 190.

190 / 5 gallons is 38. Or 1.038.

I'm not sure if there was an error in the old recipes, but in order to get 1.054 you would have to get 100% efficiency (271/5 =54.2).

 

[TWS]

??

 

[Yooper]

It’s hard to go back and forth, so this is sort of piecemeal the way I am explaining, so I’m sorry for that. In the first example, you have a higher preboil gravity than the OG. That is because you have a post boil volume of 3.5 gallons, so it looks like you added water to get to your actual post boil volume of 5 gallons. . See screenshots:

In the second recipe, you did the same, but with 70% efficiency. By adding 1.5 gallons of water, you lower the OG. Increasing the efficiency of the mash/lauter changes the numbers so you got 1.038 instead for the OG.

 

[Yooper]

It’s hard to go back and forth, so this is sort of piecemeal the way I am explaining, so I’m sorry for that. In the first example, you have a higher preboil gravity than the OG. That is because you have a post boil volume of 3.5 gallons, so it looks like you added water to get to your actual post boil volume of 5 gallons. . See screenshots:

View attachment 8394 View attachment 8395

In the second recipe, you did the same, but with 70% efficiency. By adding 1.5 gallons of water, you lower the OG. Increasing the efficiency of the mash/lauter changes the numbers so you got 1.038 instead for the OG.

I didn’t see the recipe with the OG of 1.054 (you did not provide a link to that one), but if you corrected the volumes to give you a finished 5 gallon batch of wort, and didn’t add 1.5 gallons of water, that would then give you the higher OG.

Does that make sense?

 

[TWS]

I see your point. Thank you for the information. Tom