[Stoves] Heat / cook stove - proposed design

[Crispin Pemberton-Pigott]

Dear Darren

Actually I should have mentioned something before about the termination of
the grate on the left (lower) end.

It really should extend farther under the combustion area. The grate will
never really get covered by ash and char, so it lets air enter the gas
stream at the bottom end (part of the secondary air not coming through the
secondary air port I mentioned before).

I like the angle shown. We made it movable perhaps 15-20 mm left-right by an
external ring (which can be hooked and moved by a lot of convenient tools).

The divider between the combustion chamber and the hopper will get really
hot.

There is a stove called the Kitchen King made in Pretoria that uses a
similar secondary air entry method but places it as the hopper/fire divider,
passing the air into the gas stream as it goes under the divider. The
advantage is that the part gets really hot but remains an 'air cooled' part
= longer life.

Put a controller on the secondary air (inlet on the body) as it may need far
less than you imagine. Remember you are after an excess air level of <100%
at full power - it is not all that much air.

Oh, yeah, what is your chimney height?

Regards
Crispin

+++++++++

I've got wed, thurs, fri, booked in with my blacksmith friend.

We have a lot of 3mm steel sheet we salvaged also some bits of 6mm and some
which is probably about 10mm.

I want to keep the weight down but also want it to last.  Other than the
throat area will 3mm plate do the job or do I want to be using something
thicker for the combustion area?  The area by the heat exchanger?

Best

Darren