3. ATTACH THE CHIMNEY
Take a small can and remove the top and bottom
with the can opener. Place the small can on
top of the combustion chamber (medium can) at
a 30° angle (on the intact side, away from the
bent tabs), and draw around it (Figure
F
). Again
mark, cut, and bend out 12 slice sections to open
up the hole.
Insert the small can into this hole so its base
is just within the wall of the medium can, not
protruding into it more than necessary. Place a
loop of twisting wire around the outside of the
triangle slices. Use pliers to twist the wire tight so
that it holds the small can in place (Figure
G
).
Bend down the tips of the triangles so they lock
the wire in place.
4. MAKE THE FUEL/AIR FEED TUBE
Take the remaining medium can and, with the
can opener, make a cut about two thirds of the
way around the inside circumference of the can’s
base, and then another smaller cut, leaving 2cm
gaps of uncut metal in between.
Bend the resulting larger flap of metal outward
to about 90° or so, to make a little shelf for your
pieces of wood to rest on.
The bottom cut is an air gap, to let in air to feed
the base of the fire. You can bend it inward slightly
to open it.
Use the can opener to cut out and remove the
top of the can if it’s not already. With the tinsnips,
make a 1cm cut in the wall of the can opposite the
shelf, and bend the wall inward a little (Figure
H
)
so that the can will fit inside the other medium
can (the combustion chamber).
5. ASSEMBLE THE STOVE
Place the combustion chamber into the large can
so that the opening of the medium can protrudes
slightly through the star cut in the large can.
Then take the shelved feed tube and force it
into the front of the combustion chamber
so that their outside and inside lips of metal
lock together.
Twist the feed tube so that the shelf is
horizontal, with the air gap slit at the bottom
(Figure
I
).
Rocket Stove:
How It Works
Rocket stoves burn hot but consume only
half the fuel of other woodstoves, for two
key reasons: efficient combustion, and
efficient direction of heat. This makes them
healthier too: They emit little or no smoke,
and far less particulate pollution and
carbon monoxide.
1
Small-diameter fuel — sticks burn
more efficiently than large pieces of
wood, and extinguish quickly when
cooking’s done
2
Combustion chamber — elbow-shaped
L-tube for horizontal fuel feed and
vertical heat direction; aka burn tube
3
Fuel shelf — admits small fuels only,
allows airflow beneath
4
Air gap — provides high air-to-fuel ratio
for efficient combustion
5
Insulated chimney — increases air
draft and directs heat to cookware;
confines wood gases and smoke in high
heat for near-total combustion.
—Keith Hammond
PROJECTS: Tin Can Rocket Stove
70 make.co
1
2
3
5
4
M75_068-73_RocketStove_F1.indd 70M75_068-73_RocketStove_F1.indd 70 10/9/20 12:38 PM10/9/20 12:38 PM
..................Content has been hidden....................
You can't read the all page of ebook, please click here login for view all page.