[Stoves] Malot-blower

[Boll, Martin Dr.]

-Copy to the stoves-list without attached photos-

 

Dear Jeff,

-and low tech interested members of the list.

 

Though not yet built into its housing, I think it is time to introduce my
bidirectional rotor, the Malot-rotor (Martins Low Tech-rotor).

It is the aim to work as a radial blower in a house.

 

My thoughts and constructing principles: (Base of a certainly re-invention
of a somewhere some-when invented wheel !?)

 

1. The rotor has to be built with simple and cheap and everywhere materials.
So my prototype will be altered by access or no access to different
materials.

2. The driving equipment can be stone-age-proved:

             a bow and string driving a wood-shaft. (I choose a light 8mm
bamboo-stick, 80cm long)

3. By this, the rotor must work in both turning directions, with straight
and not curved wings.

4. The constructing geometry must be simple and self-regulating: 

            Seven equal-dimensioned wood-sticks of about 11 to 12mm
thickness. Six short wood-sticks surround the equal-thick wood-shaft bear
the air-wings. (I             made the air-wings from wax-boxes from milk.
Stable leaves or can-sheet-metal will work as well, but be careful of sharp
and quickly moving sheet-            metal-wings!!)

5. The string is guided by a V- or U-rim round the shaft.

6. The bearing-axle on both sides is a nail fitting sufficient-fast into the
soft centre of the stick.

 

The air-wings/blades have two symmetrical in-cuts. You can determine the
measure by:

            Half the surrounding of the wood plus once the diameter, plus
twice the space for the fixing thread.

 

Construction advice:

It is helpful to use a small elastic rubber to hold the 6 round-woods in
position, when placing the "double2-wings between shaft and wood-sticks.

 

I tested the rotor with the bow: 17 rotations within 2.5seconds, by 70cm
bow-string in one direction and vice versa. Without house it makes a lot of
wind.

It must be tested, if a radial exit of the air or a co-axial exit of the air
is more suitable.

 

When I had sent the photos to Frans Peeters, he proposed, if a co-axial
air-exit is intended, the construct the house in a 45deg cone, air-exit to
the big side. I think an excellent idea, because the air does not change
flow-direction.

By this, the rotor could be adjusted to the geometry of the house. The
centre of the exit cross-square had to be closed by a disk, to avoid suction
from the exit-side.

 

The Malot-blower will be a very simple aid, especially it will fit well, if
the blow is only used for some time of the burning, e.g in beginning of the
fire.

 

All needed for construction of the prototype you see in the construction
photos, I address to you. 

 

 

Let us "fiddle" the fire with sensitivity and passion! :-)

 

Best regards

 

Martin