slash22000
Stereotypical Lupulin Addict
- Joined
- 2/7/12
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http://www.braukaiser.com/documents/Troester_NHC_2013_Step_Up_Your_Starter.pdf
This was very interesting. For those interested in the basic summary:
Note that on http://www.yeastcalc.com/ you can use the "K.Troester" stir plate option. Apparently Jamil's yeast starter calculations (used by about every brewer on earth) were based on a non-stirred starter, while Troester's calculations are based on constant stirring and estimates much greater yeast growth.
This was very interesting. For those interested in the basic summary:
- Constantly stirred starter showed vastly superior growth over unstirred starter (pretty sure we all know this one)
- The greater access to oxygen the greater the growth, loose foil showed much better results than an airlocked starter, completely uncovered greater again (obvious contamination concerns)
- The faster the stirring, the greater the growth - disproves conventional wisdom that "a small vortex is good enough", very significant improvement in growth between "small vortex" to "batshit insane wort cyclone"
- Higher gravity starter wort grows significantly LESS yeast - the standard 1.040 wort is fine
- Adding yeast nutrient to starter showed improved growth
Note that on http://www.yeastcalc.com/ you can use the "K.Troester" stir plate option. Apparently Jamil's yeast starter calculations (used by about every brewer on earth) were based on a non-stirred starter, while Troester's calculations are based on constant stirring and estimates much greater yeast growth.