[Stoves] Malot-blower

[frank]

Martin,
I have been trying to think in my own mind of a way to have a fan blow 
air in one direction for two steps then blow air in the other in one 
step. The air would go two steps forward and one step back - the story 
of my life. I was thinking a strong flow up through the fuel to the 
primary burn (TLUD) then a short backwards flow and then a strong 
forward flow would help the primary burn. Is that what you are thinking? 
Will your system do that?
You give me an idea.

Perhaps having four blades. Two large ones pushing air up the fuel and 
in between the two larger ones have two smaller ones pointed to pull  
air back.  So the fan goes for an equal time in one direction with your 
bow and an equal time back with the bow. But more air is pushed forward 
and less pulled back for every complete cycle. The large blades would 
need to be 'loose' so in reverse they would freely turn to be 
ineffective. But in the forward stroke they bump against a wood stick on 
the shaft to keep it in working position.

The Malot-rotor will change the world!

Frank





Boll, Martin Dr. wrote:

>-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
>
> 
>
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>
>
>  
>

-- 
Frank Shields
Soil Control Lab
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