Dear Dean
I was making a mud stove with a steel top pretty much as you describe at
TATU in Transkei about 20 years ago (time flies!) and it worked well with
two cast iron pots. The only thing different from what you describe is that
we did not use Rocketry principles.
I feel that a significant improvement can be made to the Rocket stove with
the provision of preheated secondary air though I have not drawn it out for
anyone to build. I am otherwise occupied at the moment designing a 5 ton
dumper for labour based road construction in Namibia and Tanzania. I will
get to it eventually.
If the hot secondary air was incorporated I feel that the extension in
height would not be necessary, or at least a lot of it could be removed and
you would still get little chilling and soot. It is possible of course to
preheat the primary air. Tom Reed has one of our latest stoves at the
moment and under medium-high power conditions the primary is heated
significantly. It can burn dense fuel well.
A marriage of the Basintuthu and the Rocket would solve most of your
remaining problems.
The 1/2" gap should not be a continuous, smooth one. though. It needs
little chambers similar to the ones I described for the evenly heated
rectangular plancha.
Regards
Crispin
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