<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Arial; font-size: 12pt; color: #000000'>Martin:<br><br> Thanks again. I think your experiments are well worthwhile, and hope you can continue them - even if only to suggest ideas for teachers/students.<br><br> But I still wonder if there is any hope for this being practical in any real-world setting. <br><br>Ron<br><br><br><br><hr id="zwchr"><b>From: </b>"Martin Dr. Boll" <boll.bn@t-online.de><br><b>To: </b>rongretlarson@comcast.net<br><b>Cc: </b>"Frans Peeters" <peetersfrans@telenet.be>, "Frank Shields" <frank@compostlab.com>, stoves@lists.bioenergylists.org<br><b>Sent: </b>Friday, July 22, 2011 9:08:05 AM<br><b>Subject: </b>AW: Fire Stump / stump-incuts<br><br>
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<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:navy" lang="EN-GB">Ron,</span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:navy" lang="EN-GB"> The pictures were
taken with horizontal laying stump, because the vertical pictures did not show
the type of in-cuts very well.</span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:navy" lang="EN-GB">But I only burnt the
stump upright ( circle-surface standing on bottom).</span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:navy" lang="EN-GB"> I thought there was
enough air coming through the lower side-in-cuts to feed the central hole.</span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:navy" lang="EN-GB"> </span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:navy" lang="EN-GB">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.</span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:navy" lang="EN-GB"> </span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:navy" lang="EN-GB">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.</span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:navy" lang="EN-GB">I have another 3 stumps with
bark and in-cuts (only cross-in-cuts from top) resting without my attraction in
dry condition.</span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:navy" lang="EN-GB"> </span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:navy" lang="EN-GB">If I would (expect much
and long would! </span></font><font color="navy" face="Wingdings" size="2"><span style="font-size:10.0pt;font-family:Wingdings;color:navy" lang="EN-GB">J</span></font><font color="navy" face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial;color:navy" lang="EN-GB"> ) 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.</span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:navy" lang="EN-GB"> </span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:navy" lang="EN-GB">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.</span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:navy" lang="EN-GB">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.</span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:navy" lang="EN-GB">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. </span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:navy" lang="EN-GB"> </span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:navy" lang="EN-GB">Regards</span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:navy" lang="EN-GB"> </span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:navy" lang="EN-GB"> Martin</span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:navy" lang="EN-GB"> </span></font></p>
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<p class="MsoNormal"><b><font face="Tahoma" size="2"><span style="font-size:10.0pt;
font-family:Tahoma;font-weight:bold">Von:</span></font></b><font face="Tahoma" size="2"><span style="font-size:10.0pt;font-family:Tahoma">
rongretlarson@comcast.net [mailto:rongretlarson@comcast.net] <br>
<b><span style="font-weight:bold">Gesendet:</span></b> Freitag, 22. Juli 2011
00:59<br>
<b><span style="font-weight:bold">An:</span></b> Martin Dr. Boll<br>
<b><span style="font-weight:bold">Cc:</span></b> Frans Peeters; Frank Shields;
stoves@lists.bioenergylists.org<br>
<b><span style="font-weight:bold">Betreff:</span></b> Re: Fire Stump /
stump-incuts</span></font></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><font color="black" face="Arial" size="3"><span style="font-size:12.0pt;font-family:Arial;color:black">Martin<br>
<br>
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?<br>
<br>
With the wrapped aluminum, you can have more control of
airflow, <br>
<br>
My interest is in whether there is any configuration that
ends up with charcoal?<br>
<br>
Thanks for the continued information and photos.<br>
<br>
Ron</span></font></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><font color="black" face="Arial" size="3"><span style="font-size:12.0pt;font-family:Arial;color:black;
font-weight:bold">From: </span></font></b><font color="black" face="Arial"><span style="font-family:Arial;color:black">"Martin Dr. Boll" <boll.bn@t-online.de><br>
<b><span style="font-weight:bold">To: </span></b>rongretlarson@comcast.net<br>
<b><span style="font-weight:bold">Cc: </span></b>"Frans Peeters"
<peetersfrans@telenet.be>, "Frank Shields"
<frank@compostlab.com>, stoves@lists.bioenergylists.org<br>
<b><span style="font-weight:bold">Sent: </span></b>Thursday, July 21, 2011
2:01:38 PM<br>
<b><span style="font-weight:bold">Subject: </span></b>Re: Fire Stump /
stump-incuts</span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span style="font-size:
10.0pt;font-family:Arial;color:black">Ron,</span></font><font color="black"><span style="color:black"></span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:black" lang="EN-GB">- Frans, Frank and
„Stomp-Stovers“ -</span></font><font color="black"><span style="color:black"></span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:black" lang="EN-GB"> </span></font><font color="black"><span style="color:black"></span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:black" lang="EN-GB">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.</span></font><font color="black"><span style="color:black"></span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:black" lang="EN-GB"> </span></font><font color="black"><span style="color:black"></span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:black" lang="EN-GB">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. </span></font><font color="black"><span style="color:
black"></span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:black" lang="EN-GB"> </span></font><font color="black"><span style="color:black"></span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:black" lang="EN-GB">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.</span></font><font color="black"><span style="color:black"></span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:black" lang="EN-GB">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)</span></font><font color="black"><span style="color:black"></span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:black" lang="EN-GB">.</span></font><font color="black"><span style="color:black"></span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:black" lang="EN-GB">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.</span></font><font color="black"><span style="color:black"></span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:black" lang="EN-GB"> </span></font><font color="black"><span style="color:black"></span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:black" lang="EN-GB">The difference with this
stump is:</span></font><font color="black"><span style="color:black"></span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:black" lang="EN-GB">There is a channel from
top to bottom, not made by a drill, but by chain-saw-in-cuts in 60° angles</span></font><font color="black"><span style="color:black"></span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:black" lang="EN-GB"> </span></font><font color="black"><span style="color:black"></span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:black" lang="EN-GB">Picture 001 shows that
by a metal-stick going through the central-hole.</span></font><font color="black"><span style="color:black"></span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:black" lang="EN-GB">Picture 008 shows (with
good will of the viewer) that the asterisk has a central channel, going
through.</span></font><font color="black"><span style="color:black"></span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:black" lang="EN-GB">Pictures 010 and 012
show the different position of the in-cuts from bottom in comparison to the in-cuts
from the top,</span></font><font color="black"><span style="color:black"></span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:black" lang="EN-GB"> </span></font><font color="black"><span style="color:black"></span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:black" lang="EN-GB">-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.</span></font><font color="black"><span style="color:black"></span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:black" lang="EN-GB"> </span></font><font color="black"><span style="color:black"></span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:black" lang="EN-GB">Regards </span></font><font color="black"><span style="color:black"></span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;color:black" lang="EN-GB">Martin</span></font><font color="black"><span style="color:black"></span></font></p>
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