[Stoves] Fire Stump / stump-incuts

[rongretlarson at comcast.net]

Martin: 

Thanks again. I think your experiments are well worthwhile, and hope you can continue them - even if only to suggest ideas for teachers/students. 

But I still wonder if there is any hope for this being practical in any real-world setting. 

Ron 



----- Original Message -----
From: "Martin Dr. Boll" <boll.bn at t-online.de> 
To: rongretlarson at comcast.net 
Cc: "Frans Peeters" <peetersfrans at telenet.be>, "Frank Shields" <frank at compostlab.com>, stoves at lists.bioenergylists.org 
Sent: Friday, July 22, 2011 9:08:05 AM 
Subject: AW: Fire Stump / stump-incuts 




Ron, 

The pictures were taken with horizontal laying stump, because the vertical pictures did not show the type of in-cuts very well. 

But I only burnt the stump upright ( circle-surface standing on bottom). 

I thought there was enough air coming through the lower side-in-cuts to feed the central hole. 



The burn was very uneven (and not symmetrical). And the rest of the stump – (it cracked apart because the bottom-in-cuts were going to far upwards) was partly un-burnt wood with some charcoal at the inner side. The rest was more like a fire that died without burning to the end, than a gain of charcoal. 



Possibly the very dry condition of my fir-wood (it was cut in log and with asterisk in-cuts at least a year before burning was done) made another burn-pattern then more fresh wood. 

I have another 3 stumps with bark and in-cuts (only cross-in-cuts from top) resting without my attraction in dry condition. 



If I would (expect much and long would! J ) start another experiment series, I would then prefer to set the stump into a short big-sized stove-pipe, or at least put a small metal girdle around. 



By doing with a stove-pipe surrounding (some controllable air from bottom as condition to work with) of the stump, it would be interesting with a concentrating plate on top of the stove-pipe. 

So it would tend in the direction of an old-fashioned saw-dust-stove. I can imagine that could make some torch-like flame, possibly with need of little air-push from a fan. 

In that configuration, I can imagine some charcoal-production. – But make it somehow possible to cut off the primary air at the end of the out-gassing burn. 



Regards 



Martin 






Von: rongretlarson at comcast.net [mailto:rongretlarson at comcast.net] 
Gesendet: Freitag, 22. Juli 2011 00:59 
An: Martin Dr. Boll 
Cc: Frans Peeters; Frank Shields; stoves at lists.bioenergylists.org 
Betreff: Re: Fire Stump / stump-incuts 




Martin 

The videos of this approach show them as being interesting and unusual. Is there anything at all practical? It seems you had one ignition in a horizontal position; I wonder if you tried it vertical? 

With the wrapped aluminum, you can have more control of airflow, 

My interest is in whether there is any configuration that ends up with charcoal? 

Thanks for the continued information and photos. 

Ron 
----- Original Message -----


From: "Martin Dr. Boll" <boll.bn at t-online.de> 
To: rongretlarson at comcast.net 
Cc: "Frans Peeters" <peetersfrans at telenet.be>, "Frank Shields" <frank at compostlab.com>, stoves at lists.bioenergylists.org 
Sent: Thursday, July 21, 2011 2:01:38 PM 
Subject: Re: Fire Stump / stump-incuts 

Ron, 

- Frans, Frank and „Stomp-Stovers“ - 



Here some pictures from a fire-stump. It is laying around in a garage for a year of three. I just took the pictures to explain, without need of many words. 



With such a type (but with bark) I did my test as I described in the stoves-list. But that burn was without aluminium-foil. 



I was discontent with my first test, which I made in summer last year. The burn of the dry pine-stump did not happen as symmetrically as I expected, and the stump had several times to be turned for using the wind direction to direct the burn. 

The in-cuts from the bottom were done too high, so the stump burnt too early in pieces. The central channel appeared in begin too small. (A commercial fire-stump in the web has on top a sort of dish/cup which seems to work better) 

. 

The idea to wrap it (in different test in somehow different manners) with aluminium-foil came by reading the thread about the fire-stump. So I cannot say anything about that. I have not yet planned how to play with the foil-wrapping. Here is for the moment lack of time and appropriate weather. But possibly is someone interested in that first step to struggle further. 



The difference with this stump is: 

There is a channel from top to bottom, not made by a drill, but by chain-saw-in-cuts in 60° angles 



Picture 001 shows that by a metal-stick going through the central-hole. 

Picture 008 shows (with good will of the viewer) that the asterisk has a central channel, going through. 

Pictures 010 and 012 show the different position of the in-cuts from bottom in comparison to the in-cuts from the top, 



-By going further with fire-stumps, I think it would be useful to remind the old-fashioned type of saw-dust –stoves with the central hole. 



Regards 

Martin
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