Re: Wonderful fans!

["Tom Reed" <tombreed@attbi.com>]

Dear All:

There is a great resistance to the battery operated fans by the tinkerers.
I lie awake nights thinking of alternatives and there are at least 20 other
means of supplying 3.6 kg of air to 600 g of wood per hour to make a 3 kW
cooking fire.  Then I get up and proceed with the 1.5 V AA battery that
lasts 3 hours on high (fast boil) and 6 hours on simmer and costs $0.30 to
$1 retail.

We will also market a small solar charger and lithium ion battery for those
who are offended by disposable batteries.

Tom Reed                 BEF STOVEWORKS
----- Original Message -----
From: "Gavin Gulliver-Goodall" <Gavin@roseplac.worldonline.co.uk>
To: <stoves@crest.org>
Sent: Saturday, June 01, 2002 9:52 AM
Subject: RE: Wonderful fans!


> Has anyone investigated clockwork- like the clockwork radio. Or gravity -
> like a pendulum clock escapement?
> Something simple like an endless string loop going round a pulley- Pulley
> connected via high gearing to a small fan. String has 3 knots in it
equally
> spaced- there are 2 weights which are slipped over string above knot at
the
> top of the loop and removed at the bottom so you get -say 3 minutes blow
for
> moving the weight once- no constant tending, no batteries, renewable fan
> power?
> I taught kids at a school where we used the falling weight driving a fan
as
> a simple timing device- the fan provided braking so the weight fell slowly
> and they could time an egg with it.
>
> Just a thought for you inventors with stoves to try if you fancy
>
> Or a bicycle pump and a small storage tank- could be a foot pump and a car
> inner tube-
> How much air is needed for enough "blow" to cook a meal with efficient
smoke
> free combustion  ?
>
> Cheers
> gavin
> Gavin Gulliver-Goodall
> 3G Energi,
>
> Tel +44 (0)1835 824201
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> -----Original Message-----
> From: Dean Still [mailto:dstill@epud.net]
> Sent: Friday, May 31, 2002 7:31
> To: stoves@crest.org
> Subject: Re: Wonderful fans!
>
> Dear Paul, Tom, and all,
>
> Peter Scott, Ken Goyer and I have been trying for a while to add a small
fan
> to a sidefeed Rocket. The experiment that shows best promise is made from
a
> 8" high two inch thick home made firebrick cylinder inside a coffee can.
The
> firebrick combustion chamber is pushed against the inside of the coffee
can
> leaving a crescent moon space on the opposite side... A 4" in diameter
round
> hole is cut through both the can and combustion chamber, (near the base of
> each) into which sticks, on top of a shelf, are fed. The space between the
> top of the combustion chamber cylinder and coffee can is filled with
> fiberglass insulation. A 3" in diameter computer fan is used to blow air
> into the space between the firebrick cylinder and coffee can. The air
enters
> the combustion chamber through 1/8th inch holes at the level of the shelf
> except where the holes would blow air out the horizontal feed magazine. A
> higher ring of similarly positioned 5/16" holes, two inches above the
level
> of the shelf, adds additional turbulence.
>
> The stove shows very little smoke, most of the time the air is clear above
> the stove. A pot used to boil water (38% efficiency) had no soot on it
after
> the test. The yellow flames are very excited, as can be imagined. I'll
post
> a picture soon. Aiming the jets of air away from the horizontal fuel
> magazine allows wood to be introduced in the normal manner while the fan
is
> cleaning up smoke and blowing air up the chimney.
>
> Tom, as usual, is right, I think...Air is the solution to pollution. In
this
> case, the air is even cold but the jets of air make for a very active fire
> that does not want to smoke even when too much fuel is pushed into the
fire.
> In our last experiment, Ken rigged up a regulator to the air supply. When
we
> pushed way too much fuel into the combustion chamber adding even more air
> immediately cleaned up the smoke. Now if we could only do this without a
> fan!
>
>  Looks to me that a natural draft stove will not smoke if the operator
does
> not feed in too much wood but a fan allows the operator to be considerably
> more cavalier. If the fan is reliable the chimney can be gotten rid of and
> efficiency rises higher. Leaving a chimney above the fire lets the stove
> function pretty well when the fan ceases to create its magic.
>
> Best,
>
> Dean
>
>
>
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