RE: Lanny's Simple Camp Fire Stove

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

Lanny - like Kevin,  I like what you have done.  A few questions:

1.  Your flange to accept the pot looks very clean.  Did you do that with
the pliers or do you have some of a flanging tool?  (anyone know where to
get flanging tools?)

2.  One (maybe two) thin layers of metal inside or out will cut down the
thermal losses. If you get a chance to see the difference in performance,
please let us know.  (maybe also letting us know also about the outermost
wall temperatures)  Also maybe a wrap of fiberglass blanket?  It will be
interesting to hear whether these are worth the extra cost.

3.  I believe the rocket stove group sees a good deal of value in a grate.
If you can try yours with and without a simple grate, that information would
be valuable.  Your starting without the stove on just an outisde small fire
with coals also seems novel and definitely saves some time and probably
allows efficient use of scrap fuel materials in advance of starting an
actual cooking.

4.  You probably are getting a good bit of value out of the hot coals at the
bottom of the unit. Some good radiation up to the pan bottom and they dry
out your wood.  It would be interesting to hear what happens in terms of
time to boil, with and without the prior coals.

5.  Can you tell us more on the dimensions - especially the radial
separations from pot to outer wall and the height of the pot bottom over the
burning wood and the coals.

6.  Yours is one of the very few stoves we hear about with a chimney pipe -
so it will be very interesting  to hear more about the performance of that
pipe.  Are there two sections?  (in the US often 2 feet = 60 cm each)  What
would happen with 1 or 3 sections?  Are these 6 inch = 15 cm diameter?

7. You said you controlled air flow - but none of the descriptions or
pictures show whether you have a flapper valve in the chimney itself.  If
you do, or could, it would be nice to hear what sort of power ratios
(turn-down ratios) you can achieve.  (This could be measured by the rate of
fuel consumption).  Maybe measuring exit temperatures would tell us
something interesting.  Maybe just covering part of the top of the stove
pipe would be enough like a flapper valve for a first test.

8.  You seem to have quite a lot of air possible to enter through the wood
entry port (like the rocket stove - which only has the one port).  What
would happen if you closed off all the other ports?  Could you balance the
loss of air by adding one more pipe section?

9. The hole between the stove and the chimney pipe - could you give us those
dimensions?   It would seem that a good bit of the flame would exit into the
stove pipe without doing much heating of the pot  (that is - you would
mostly like the exhaust gases to all go past the cook pot first.  Yours is a
nice elegant solution - but I wonder if you see some other
(not-too-difficult) way to get all the gases going up before going out.  I
don't see it myself.



-----Original Message-----
From: Kevin Chisholm [mailto:kchisholm@ca.inter.net]
Sent: Tuesday, October 22, 2002 8:02 AM
To: Lanny Henson
Cc: stoves@crest.org
Subject: Re: Lanny's Simple Camp Fire Stove


Dear Lanny

That is a brilliantly simple system!!

Is the pot supported by its handles on the "top edges"
of the stove?

Once the stove is made, wouldn't it be good for the
specific pot for which it ws made? (or at least one of
the same diameter at teh handle level.)

Kindest regards,

Kevin Chisholm
> Lanny Henson wrote:
>
>
> Stove Friends,
> Check out my simple stove that is made from onlt two
> parts. The first part is a metal 5 gallon bucket. The
> second part is a piece of chimney pipe. A flanged
> hole is installed into the bottom of a 5-gallon
> bucket to fit an 8-quart stockpot. Flanges bent over
> a slot attaches the chimney. Tabbed holes are cut for
> fuel feed and air intakes. This stove can be built
> with a knife and a pair of pliers. It took me 35 min
> to build the first one. I built an open fire then set
> the stove over the fire and coals. I fed sticks into
> the slots and adjusted the airflow until it sounded
> good. In my first attempt I boiled 6 Qt of water in
> 12 min using moist sticks for fuel. I may add a third
> part to seperate a combustion zone from the pot.
> Lanny
> http://www.lanny.us/campfs.html

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