Re: The Mayon Turbo Stove

["Ron Larson" <ronallarson@qwest.net>]

Roger (cc Stoves):

Today, you said:

> Ron
>
> We tried making the centrepiece from clay with some success on our older
> model though we never introduced it into communities.  It doesn't have
> the same stability as the ring structure for holding pots.

(rwl):  It might be possible to have local potters "weld" the inner and
outer parts together.  Then the rice hulls might flow through 3, 4, 5, 6...
"ports" separated by the same number of "posts" that give the desired (1+
inch?) separation.  This will give the desired stability - but probably
increase the breakability a lot (both handling and differential thermal
expansions).  Only a few trials will tell.

    It seemed that your pot sat on a metal stand and that this stand was
totally separate from the fuel holder and central combustion areas.  True?
It seems reasonable to keep that separation of materials and functions.  Or,
if all was metal, were they solidly connected to each other?

>A clay
> centrepiece would reduce the stove cost by about 1/3rd compared to a
> metal centrepiece. If we went with the small Mayon Turbo 6000 model and
> a clay centrepiece we might be able to get the cost to $4-$4.50 per
> cooker.

(RWL):  Does this price include the stand - and if you can - could you
separately price the stand alone?  If the stand carries the weight of the
pot, perhaps stability is not great an issue.

> Next week I go to the Philippines and we plan to do a bit more
> development work on it while I am there. Likely it would be a good
> option for us to reduce our risks on loan repayments. Once people could
> afford it they could upgrade to a metal centrepiece if they so desired.
> It would be interesting if someone (like Dean Still) who has more
> experience than us with other materials used for stove fabrication could
> also try experimenting with insulative materials and incorporating them
> into the stove design.
>
    (RWL)  The insulative property of the Apprevecho bricks was developed by
mixing sawdust (rice husks?) with the clay.  Maybe you can do your own
tests - as your local clays will be different anyway from those tested by
Dean and Ken Goyer.  I think Ken was getting sawdust close to 50% by
volume - but you may want and need a different mix.  The aim is to get a
good combination of porosity and strength.  Guessing that pottery is pretty
cheap there, you probably can learn a lot with a test protocol only costing
a few hundred dollars.

    Wish you luck.  Good luck on your trip.    Ron





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