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Questions tagged [stir-plate]

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4
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1answer
43 views

What is a realistic growth factor in large volume stir plate yeast starters?

The Homebrew Dad yeast starter calculator (which gives you more numbers than the Mr. Malty one does) promises a yeast growth factor of about 45 times for 10 billion cells pitched into 3 litres of 1....
4
votes
4answers
86 views

Alternative to stir plate for yeast starter (and erlenmeyer flask)

Looking at creating my first yeast starter for a DIPA recipe with on O.G. target of 1.085. For this O.G. Brewer's Friend is telling me I would need a 3L starter of an O.G. of 1.040 with a stir plate ...
2
votes
1answer
59 views

Carboy-sized Magnetic Stirring

I want to re-suspend yeast and generally keep a brew uniformly mixed in a carboy without having to open it and expose it to oxygen every time. Is there a hobbist-priced magnetic stirrer that works ...
2
votes
1answer
69 views

Simulating a yeast starter for fine tuning a stir plate

I'm building myself a stir plate out of some things from my scrap heap of computer parts (mainly an old external hard drive and a case fan). I've used it in its prototype stage for one yeast starter ...
2
votes
1answer
99 views

My first yeast starter with a stir plate, possibly a disaster

This morning I smacked my first smack pack, and about 10 times, each time a little harder because deep depression would set in if the goodies spewed across the room. I finally got it, or so I thought. ...
1
vote
1answer
167 views

Jumbo stir plates?

Now that I've discovered (thanks to jsled and Google) what a stir plate is and why I need to make one, I'm curious to know how far they can be pushed. Being a lazy brewer with a fairly well-equipped ...
1
vote
1answer
2k views

What is the proper way to supplement a yeast starter with oxygen via an aeration stone?

I have two yeast starters going on my two homemade stir plates. The stir bar or the stir plate for one of them is malfunctioning and I can not increase the speed enough to get a vortex going. It is ...
4
votes
2answers
2k views

Why Don't we Shake the Carboy

From chemistry I recall that we were supposed to shake almost everything in order to get the elements to react. With wort, however, we simply dump yeast in and wait 4 weeks before bottling. I would ...
1
vote
1answer
791 views

Yeast Starter Vortex Size

I've read online that the size of the vortex in a yeast starter does not matter. Why is this true? When I was experimenting with water yesterday, I created a monster vortex (very cool) and could see ...
1
vote
2answers
1k views

Total Volume of Yeast Starter in Regards to Evaporation from Boiling Wort

Today I did my first yeast starter. I purchased the 2000mL flask and DME from northernbrewer, and it came with instructions for doing both 1000mL and 2000mL batches. It suggests 1000mL for 5 gallons ...
11
votes
4answers
2k views

Why an Erlenmeyer flask?

Why is the Erlenmeyer style flask the automatic go to for yeast starters? I know people use other containers besides flasks, and some flasks don't have flat bottoms but is there something special ...