In my 2L flask, any size starter works just fine, and can be left alone indefinitely without any problem.
With my 5L flask, my stir-bar is constantly being thrown though. What would be the cause of this? Physics was never my thing but my gut tells me it's probably encountering extra resistance/drag, and that it's just not able to keep up with the magnets - is this actually a possibility? If so, I'd assume it can be fixed by modifying it to further slow the fan down, but would adding extra magnets (stacked, adjacent along the circumference, or along the same line created by the first two magnets) help it increase the attraction to overcome that drag, assuming that could even be the problem? I'm using rare earth magnets I purchased from a lab supply store (I have the numbers on how strong they are somewhere), but does doubling up on the magnets by stacking them also double their strength?
Any help would be appreciated... it's annoying having to step up starters when I have a perfectly good 5gal flask available.
With my 5L flask, my stir-bar is constantly being thrown though. What would be the cause of this? Physics was never my thing but my gut tells me it's probably encountering extra resistance/drag, and that it's just not able to keep up with the magnets - is this actually a possibility? If so, I'd assume it can be fixed by modifying it to further slow the fan down, but would adding extra magnets (stacked, adjacent along the circumference, or along the same line created by the first two magnets) help it increase the attraction to overcome that drag, assuming that could even be the problem? I'm using rare earth magnets I purchased from a lab supply store (I have the numbers on how strong they are somewhere), but does doubling up on the magnets by stacking them also double their strength?
Any help would be appreciated... it's annoying having to step up starters when I have a perfectly good 5gal flask available.