[modeleng] Re: Char

Yeah Lee, I don't think Warwick's test was much indication - apply liberal
draught to the BBQ fuel and you get a very active fire, not just glowing
lumps.


> I have copied a few paragraphs from AME on part of the test. I hope it
> doesn't infringe copyright laws to much.
> Australian Model Engineering  Issue 119
> By  Warwick Allison
>
> "One final experiment was to burn some of the Welsh coal side by side with
> char and a piece of Collie coal souvenired at the last Bunbury convention.
> This done by playing a small propane torch on the pieces sitting on a fire
> brick."
>
> (This is certainly not the Welsh coal that Alan described)
>
> "The Welsh coal flaked into pieces. Each piece was shiny bright black, and
> it burnt as it did this. Once the pieces were about 3-4mm, there was no
more
> burning. There was virtually no flame. In some respects it literally fell
> apart when heated and any heat it produced was during this process, and it
> was fairly limited at that. When the flame was removed, the burning
process
> stopped fairly quickly."
>
> (Collie coal is a West Australian coal not available on the eastern
> seaboard)
> "The char stayed in one lump, and its performance was closer to BBQ heat
> beads than coal (which is not surprising seeing the company also produces
> this type of product). It took a while to heat up, but when it was hot it
> just glowed and retained its heat. It did not break down, but rather the
> piece just shrank smaller as the outside surface turned light brown and
this
> powder fell away. This was at a fairly slow rate. There was no flame. When
> the flame was removed it stayed glowing and hot the longest of all three."


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