using mr malty android app

[FreeLordBrewing]

need any input or advice.

I am going to put out some numbers here.

OG is going to be 1.116

I am using a Wyeast activator 1056 american ale. with a viabillity of 74% based on MFG date of smack pack per Mr malty.

going to pitch this into a 2.5 gal batch of 1.116 gravity.

just picked up a stir plate.

based on Mr malty calculator I need 191 billion cells.

just purchased the mr malty app on an android phone.

choosing the "liquid yeast" option, and starter type: stir plate.

the calculator spits out this info:

packs needed: 1 pack

liters needed: 1

now at the bottom of the app is an adjustable slider for "growth rate"

how do I know where to slide this amount to?? is there a formula I can use to obtain this information??? when I first inputed this info the slider went to what I believe was a "default" rate at 3.02

I have a 2000ml erlenmeyer with foam stopper to allow the starter to breath in/out.

not using any o2 and I was going to use the 1 gram of of extra plain DME for every 10 ml of final starter wort volume as a base to reach a 1.030-1.040 gravity.

it is at a growth rate below 2.7 that the calculator then recommends to use 2 smack packs. but remains using 1 all the way up to 5.9 growth rate.

any help would be appreciated thanks in advance -F.R.B.

 

[MalFet]

"Growth factor" measures the extent to which yeast will tend to multiply, and different calculators use different values as a default. Unfortunately, it's not really the kind of thing you can figure out theoretically. Unless you're looking to run some experiments yourself, your best bet is to just use the default value.

 

[FreeLordBrewing]

thanks! for the reply

 

[Brewmex41]

Let us know what you think of the app. I don't have a laptop and the calculator on the mobile Mr malty website requires plug ins you can't get on a phone.

I've considered getting the app, but I haven't had any issues pitching yeast so far. It would only be to try and really dial my beers in.
So id like your thoughts on the app.