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caseydavenport / biermacht

Homebrewer's Companion for Android
Apache License 2.0
23 stars 10 forks source link

Issue (IBUs) and requests (unit conversions, calculator) #63

Open ds-brew opened 8 years ago

ds-brew commented 8 years ago

Hi there,

I noticed that the estimated IBUs in Biermacht is off from the IBUs I have in 2 programs on my pc. I have a hop that has 7% alpha acid and 4% beta acid in it. With 30.9g, the IBU in beersmith 2 is 21.8 IBUs, in another program I have it's even 24.4 IBUs. In Biermacht, it is only 12.91 IBUs. Which IBU estimation was used and is it possible to add more authors (Tinseth, Ragar, Garetz, Daniels, Mosher, Noonan)?

I miss a converter between Plato/sg/brix and conversion of other commonly used units. EBC as color indicator would also be a nice feature, but I saw that was already reported. For EBC, also multiple authors are used (Moray, Daniels, Mosher), would be nice if you can adjust the author as well.

A gravity adjusting calculator would be nice to have (other calcutions are for example included in brewzor pro, would be nice if some could be incorporated in Biermacht).

Thanks D.

pricelessbrewing commented 8 years ago

I can't speak for the biermacht formulas specifically but none of the ibu formulas are an exact science. Theres a ton of variables not taken into account, hop storage, pelletization, kettle size, boil off rate, wind speed, boil ph, and utilization diminishing returns as the ibu increases it gets harder to reach high ibus. This isn't really accounted for well, so pretty much anything above 75~ ibu is lower than listed.

My guess is biermacht is using either a variant of tinseth by default or one of the opposing formulas (rager or Morey).

On Oct 31, 2016 5:53 PM, "ds-brew" notifications@github.com wrote:

Hi there,

I noticed that the estimated IBUs in Biermacht is off from the IBUs I have in 2 programs on my pc. I have a hop that has 7% alpha acid and 4% beta acid in it. With 30.9g, the IBU in beersmith 2 is 21.8 IBUs, in another program I have it's even 24.4 IBUs. In Biermacht, it is only 12.91 IBUs So even estimating IBUs doesn't seem to be exact science, it is a lot different in the Biermacht app. A mistake in the formula in the app?

I miss a converter between Plato/sg/brix and conversion of other commonly used units. EBC as color indicator would also be a nice feature, but I saw that was already reported.

A gravity adjusting calculator would be nice to have (other calcutions are for example included in brewzor pro, would be nice if some could be incorporated in Biermacht).

Thanks D.

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ds-brew commented 8 years ago

Oh yes, see above. I was to late to adjust. Would be nice to know which author was used. :)