Very different results from 2 yeast starter calculators?
Posted: Mon Jul 01, 2013 5:34 am
by butterman
Below are the results I came up with for a comparison of the Beersmith2 & Mr Malty yeast starter calculators. Their viability results are very different for a liquid activator (Wyeast), using a stir plate.
I would like your thoughts on the disparity which is quite significant. Which calculator would you recommend I use?
Thanks
@2wks
BS2 65.32%, 0.75L, 1pk
Mlty 62.00%, 1.0L,1pk
@1 &1/2 mths
BS2 51.60%, 0.85L, 1pk
Mlty 41.00%, 1.0L, 2pks
@2 &1/2 mths
BS2 40.45%, 0.94L, 1pk
Mlty 19.00%, 1.0L, 4pks
@3 &1/2 mths
BS2 32.46%, 1.13L, 1pk
Mlty 10.00%, 1.02L, 6pk
@4 &1/2 mths
BS2 25.44%,0.86L, 2pk
Mlty 10.00&, 1.02, 6pk
Re: Very different results from 2 yeast starter calculators
Posted: Mon Jul 01, 2013 7:35 am
by brewindruid
I would always go with the more conservative numbers, so even if the viability were higher I am still good to go and have a margin on pitch amount.
I don't know were Brad gets his numbers, but based on JZ's research and collaboration with Chris, I would definitely go with his numbers.
JMHO
Cheers
Scott
Re: Very different results from 2 yeast starter calculators
Posted: Mon Jul 01, 2013 7:43 am
by linuxelf
One of the guys in our club actually bought the hemocytometer, and did his own yeast experiments. He said his numbers matched extremely close to Jamil's.
Re: Very different results from 2 yeast starter calculators
Posted: Mon Jul 01, 2013 7:54 am
by brewindruid
Damn, must be nice!
No surprise though, JZ put a ton of work into his numbers, then gives it all to use pro bono!
Always good to have the independent results back'n things up!
Cheers
Scott
Re: Very different results from 2 yeast starter calculators
Posted: Mon Jul 01, 2013 11:47 am
by Ozwald
+1 to Mr. Malty
Which may come of a surprise to some of the regulars around here since it's no secret I don't particularly care for him as a radio host. But I spend my fair share of time staring at my yeast through a scope & I'd agree with his numbers over BS2, which has some other inaccurate calculations based on what others share in the forums. Contrary to the ad, I did the trial. I didn't switch.
Re: Very different results from 2 yeast starter calculators
Posted: Mon Jul 01, 2013 12:25 pm
by brewindruid
There is a new version coming out this fall, it has worked fairly well for me leaving aside faults with colour and IBU. I can't fault either Brad or JZ, Brad made it so I could see the software, and JZ put some serious knowledge on the interwebs. With my cappy eyEs, I would be at a serious disadvantage otherwise!
What software are u using Ozzy?
Re: Very different results from 2 yeast starter calculators
Posted: Mon Jul 01, 2013 3:08 pm
by Ozwald
brewindruid wrote:There is a new version coming out this fall, it has worked fairly well for me leaving aside faults with colour and IBU. I can't fault either Brad or JZ, Brad made it so I could see the software, and JZ put some serious knowledge on the interwebs. With my cappy eyEs, I would be at a serious disadvantage otherwise!
What software are u using Ozzy?
ProMash