Still Shape Theory or Experience

I've been practicing (ok, playing) with our 4" CD and have a number of TPWs and other stripping as well as one or 2 spirit runs under our belts... but when I watch 'Distillery walk through's' by various commentators, they all seem to espouse the various shapes of the different stills.

Is there anywhere that explains what the difference in shape actually does? What effect an 'Onion' has on the process? What effect a low squat still has as opposed to a tall still??? And if so, is there a reason why our stills are the shape they are? Is it cost efficiency or design advantage?

I'd like to know b cause one day I'd like to build a still; and when I do, I'd like to know the purpose and functionality of every bit of it...


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