<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Arial; font-size: 12pt; color: #000000'><style>p { margin: 0; }</style><div style="font-family: Arial; font-size: 12pt; color: #000000">Rob:<br>
<br>
Thanks for sharing these additions. Does anyone know if the unit
first given by Jeff Davis had a "Rocket" design (horizontal hole) for
air or whether the central hole might go all the way through to the
bottom?<br>
<br>
I think these (both central hole and splits) could make for an interesting classroom demonstration. The points to make are<br>
<br>
1. that the energy from the flame anywhere is mostly captured.and
used to keep the flame going on opposite surfaces. For the rocket
shape, almost no radiant energy is lost. For the wedges, little is lost. None. of
the narratives I watched (and there are a lot more than Rob has given)
talked about the importance of radiant energy cappture. It would be fairly easy to pull the wedges apart in
steps - and at some separation the flames would go out.- showing the
importance of capturing this radiant energy.<br>
<br>
"Stumps" of different lengths but otherwise the same could show the
chimney effect nicely. Might be able to control power level with a
lower plug.<br>
<br>
2. In the Rocket (central hole design) it would have been good to
have someone show flame control by partially closing the lower air
supply. Might be able to find a way to relate air hole size (and air volume) to power level<br>
<br>
3. It would be interesting to see if a TLUD design could be operated
with a set of secondary air holes part way up. I don't think so -
since the pyrolysis front drops to the bottom almost immediately. Then
the combustion will mostly occur at the bottom. I think it would be
almost impossible to make char with this design.<br>
<br>
4. There are sawdust stoves (sometimes called Boy Scout??) that
operate similarly (to the central hole design). Dr. Priya Karve did some nice
theoretical/experimental work on such.<br>
<br>
5. No one talked about the great efficiency of the Kelly Kettle - because the flame is going up the center.<br>
<br>
6. I wish I had seen how difficult it was to drill the central hole
of the Rocket design. Is there a power tool on the market like the
chain saw (but for drilling holes)?<br>
<br><br>
7. This is way off topic - but there was great long video dubbing a 1930 film of logging at:<br><br>
http://www.youtube.com/watch?v=cIKCjQdxtO0&feature=related<br>
<br><br>Ron<br>_____________________<br><br>
<b>From: </b>"Rok Oblak" <rok.stoves@gmail.com><br><b>To: </b>"Discussion of biomass cooking stoves" <stoves@lists.bioenergylists.org><br><b>Sent: </b>Saturday, July 16, 2011 12:27:22 PM<br><b>Subject: </b>Re: [Stoves] Fire Stump<br><br>Here are Siberian, Finnish and Swedish and supposedly a Canadian version! No stove needed!<br><br><a href="http://www.youtube.com/watch?v=gMLzY48YwEM&feature=related" target="_blank">http://www.youtube.com/watch?v=gMLzY48YwEM&feature=related</a><br>
<a href="http://www.youtube.com/watch?v=jOAejiwCIpg&feature=related" target="_blank">http://www.youtube.com/watch?v=jOAejiwCIpg&feature=related</a><br><a href="http://www.youtube.com/watch?v=wEHSJftQ9Vg&feature=related" target="_blank">http://www.youtube.com/watch?v=wEHSJftQ9Vg&feature=related</a><br>
<a href="http://www.youtube.com/watch?v=ndcXILxxy_0&feature=related" target="_blank">http://www.youtube.com/watch?v=ndcXILxxy_0&feature=related</a><br><br><br><br><div class="gmail_quote">On Fri, Jul 15, 2011 at 10:19 PM, Richard Stanley <span dir="ltr"><<a href="mailto:rstanley@legacyfound.org" target="_blank">rstanley@legacyfound.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">Jeff,<br>
<br>
Clever stuff: Someone obviously made three intersecting plunge cuts through the center long axis of the stump, in a 6-sided star pattern. This effectively has turned a fuelwood log into a hollow core briquette !<br>
<br>
Would like to<br>
1) compare its burn performance: heat curve emissions time to ignite, time to heat xkgs of water to boiling etc,<br>
..... as compared to same log, ex these star cuts.<br>
2) pursue same star pattern molded into an agro residue briquette.<br>
<font color="#888888"><br>
Richard Stanley<br>
<a href="http://www.legacyfound.org" target="_blank">www.legacyfound.org</a><br>
NW Obamaland.<br>
</font><div><div></div><div class="h5"><br>
<br>
On Jul 15, 2011, at 7:23 PM, Jeff Davis wrote:<br>
<br>
> Dear List,<br>
><br>
> The odd things one can find when shopping for nuts:<br>
><br>
> <<a href="http://www.ecoforestfirewood.com/eco-forest/light-n-go-tm-bonfire-log/" target="_blank">http://www.ecoforestfirewood.com/eco-forest/light-n-go-tm-bonfire-log/</a>><br>
><br>
><br>
> Truly stumped,<br>
><br>
><br>
> Jeff<br>
><br>
><br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br><div><b>Rok Oblak, MAA Design</b><br><br>+1 604 710 1615<br><a href="mailto:rok.stoves@gmail.com" target="_blank">rok.stoves@gmail.com</a><br><a href="http://www.holeyroket.com/" target="_blank">www.holeyroket.com</a><br>
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