[Stoves] Char from coir Re: Biochar Inquiry

[Richard Stanley]

Good insights Crispin,

Re V pattern versus straight spiral: It was enough of a challenge to get the artisans to hold the necessary 2mm wobble tolerance thru one full  revolution. Besides the spike elements are  cut off concrete nails : they  have inbuilt lengthwise striations . Little long axis  side-thrust  material along the  long-axis.   We also experimented with addition of a chopper element such as   shown in its larger TMC cousin (on website). The chopper element in the TMC definitely required a flywheel which was created by the  12,  ½" thick x 2" x 7" long cutter bars welded onto the periphery of that machine's rotor. 

In as much of the action of the mini TMC is pen fo frequent ocscillation ( for the mentioned desired slashing effect of harder materials) : A  flywheel would add little benefit in such case. The fact that the cutter bars are mounted in rubber  increases momentum thru the returning slashing  action of the cutter bars themselves. 
The  fact of reversing direction frequently would also tend to  negate the center concentrating benefit of a V wedge design if ther were one, in either case I think. 
Will be testing it a bit further here ( in Nicaragua) before putting out the manual for it in a month or so. 

Richard 


On Apr 15, 2014, at 9:13 AM, Crispin Pembert-Pigott wrote:

Dear Richard
 
I am surprised to see the working bits of the mini TMC have a spiral from one side to the other for the reason that it creates a constant thrust in one direction. Have you not tried putting a Vee-pattern rather like a tractor tire, bringing everything constantly to the centre and away from the edges?
 
That takes the load off the side walls and removes the axial thrust. It looks like a pretty good unit. Is there a flywheel hidden in there somewhere?
 
Thanks
Crispin
 
 
 
 
Our mini TMC (developed for use here in Central America)is less technically sensitive, more manageable in the field with less skills and lighter at 25 kegs but it is not 
designed to handle coconut husks. 
 
would not. 
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