Dan -- go to YouTube.com and search for tow-behind papercrete mixer. You'll find several videos showing them in action.
Don't know the answer regarding blade length. Do know that a builder in the Deming, NM, area uses a short stubby piece of channel iron fence post in a 200-gallon tub to good effect. (Cheaper than lawnmower blades, too.)
Am building one of these in August and plan to try the fence-post blade first.
Hope that helps,
ken winston caine
--- In papercreters@yahoogroups.com, "Clarke2" <clarke2@...> wrote:
>
> On the subject of the blade placement, I'm curious how critical the diameter of the blade, as it relates to the diameter of the tub, is.
>
> Having never seen a car rear end type mixer in action, I'm trying to invision the motion of the papercrete as it is being shredded and mixed.
>
> I'm wondering if I could use a 5 foot diameter by 2 foot high tub with a 20" lawn mower blade. Would the entire contents of the tub be drawn into the mix?
>
> How about if I were mixing a small batch that filled the tub only half full?
>
> Thanks,
> Dan
>
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