Rousing yeast using a stir bar in the carboy

[mordantly]

i put a full carboy of water on my lab plate once for shits and giggles. i put fermenters on my 4-wheel dolly and roll them around the garage.

[Cliff]

[
Yeah ??? Would you really?

I don't think so. You only need a stirplate strong enough to spin the bar. We're talking rousing the yeast. We're not trying to vortex and aerate a 5 gallon starter.

Quite so. Except the poor little stir bar will be buried in an inch of thick cake.
You'll have to move it against that.
I think the law of large numbers is against you.

[28paws]

Without ever having tried it, it seems to me that if you could get the stir bar to actually spin before the cake was formed that the cake would form around it.

[
Yeah ??? Would you really?

I don't think so. You only need a stirplate strong enough to spin the bar. We're talking rousing the yeast. We're not trying to vortex and aerate a 5 gallon starter.

Quite so. Except the poor little stir bar will be buried in an inch of thick cake.
You'll have to move it against that.
I think the law of large numbers is against you.

[spiderwrangler]

I don't think it was mentioned, but most carboys have a bit of a domed bottom, so unless you have the proper stirbar, keeping it centered would be difficult anyway...