<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">Alex and list</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Apologies for the length and for keeping all I found. I decided to not just report on the best. If anyone has one that they like better than these, I hope they will let us know.</div><div class=""><br class=""></div><div class="">1. <span class="Apple-tab-span" style="white-space:pre"> </span>I found five Nova Videos (the video you cite):</div><div class=""> <a href="https://www.youtube.com/watch?hl=en&v=QsH_Gh-n2Mg" class="">https://www.youtube.com/watch?hl=en&v=QsH_Gh-n2Mg</a> (9:57) </div><div class="">This dated 2009 has English subtitles</div><div class="">or</div><div class=""><a href="https://www.youtube.com/watch?v=QsH_Gh-n2Mg" class="">https://www.youtube.com/watch?v=QsH_Gh-n2Mg</a> (9:57)</div><div class="">or (same)</div><div class=""><a href="https://www.doovi.com/video/novavideo-nat-mulcahy-e-la-luciastove-now-with/QsH_Gh-n2Mg" class="">https://www.doovi.com/video/novavideo-nat-mulcahy-e-la-luciastove-now-with/QsH_Gh-n2Mg</a> (9:57)</div><div class="">or (Same)</div><div class=""><a href="http://www.yourhomeexplained.com/novavideo-nat-mulcahy-e-la-luciastove-now-with-english-subtitles/" class="">http://www.yourhomeexplained.com/novavideo-nat-mulcahy-e-la-luciastove-now-with-english-subtitles/</a> (9:57) Nov 5, 2011</div><div class="">or (same)</div><div class=""><a href="http://www.lyrics-youtube.com/lyrics/novavideo-nat-mulcahy-e-la-luciastove-now-with-english-subtitles-QsH_Gh-n2Mg" class="">http://www.lyrics-youtube.com/lyrics/novavideo-nat-mulcahy-e-la-luciastove-now-with-english-subtitles-QsH_Gh-n2Mg</a> (9:57)</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Mostly these had English sub-titles, I didn’t find this video to be the best around. It was not clear whether he was talking pyrolysis or gasification. So I went looking for more - all given below. </div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">2. I found these for the Pup stove: (Not by Nat; by a chap named Hiram)</div><div class=""> a. <a href="https://video.search.yahoo.com/yhs/search?fr=yhs-Lkry-SF01&hsimp=yhs-SF01&hspart=Lkry&p=nat+mulcahy+stove+video+world+stove+pup#id=5&vid=8fd7c4c57f67797d29919df47ae31d32&action=view" class="">https://video.search.yahoo.com/yhs/search?fr=yhs-Lkry-SF01&hsimp=yhs-SF01&hspart=Lkry&p=nat+mulcahy+stove+video+world+stove+pup#id=5&vid=8fd7c4c57f67797d29919df47ae31d32&action=view</a> (this is #2 of 3 - showing the inner tube (a pipe) - not seen in #1 (next). </div><div class=""><br class=""></div><div class=""> b. <a href="https://video.search.yahoo.com/yhs/search?fr=yhs-Lkry-SF01&hsimp=yhs-SF01&hspart=Lkry&p=nat+mulcahy+stove+video+world+stove+pup#id=1&vid=b6012a2d0b56a2dc97b27d647ae45140&action=click" class="">https://video.search.yahoo.com/yhs/search?fr=yhs-Lkry-SF01&hsimp=yhs-SF01&hspart=Lkry&p=nat+mulcahy+stove+video+world+stove+pup#id=1&vid=b6012a2d0b56a2dc97b27d647ae45140&action=click</a></div><div class="">This for #1 of 3:I see lots of red hot char here at 6:00- probably not TLOD - not sure why.</div><div class=""><br class=""></div><div class="">c. No new information in the 3rd.,</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">3. Beaner stove - same chap (Hiram again) <a href="https://video.search.yahoo.com/yhs/search?fr=yhs-Lkry-SF01&hsimp=yhs-SF01&hspart=Lkry&p=nat+mulcahy+stove+video+world+stove+pup#id=3&vid=58a5c81941f4a1b96c61d22dd60cec41&action=view" class="">https://video.search.yahoo.com/yhs/search?fr=yhs-Lkry-SF01&hsimp=yhs-SF01&hspart=Lkry&p=nat+mulcahy+stove+video+world+stove+pup#id=3&vid=58a5c81941f4a1b96c61d22dd60cec41&action=view</a> (This is simpler - a coke can outside - this seems to be TLOD - very different (dark coals). Seems to be the same inner pipe, but different heights of the outer can.</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">4. Nat’s Origami stove - very short video </div><div class=""><a href="https://video.search.yahoo.com/yhs/search?fr=yhs-Lkry-SF01&hsimp=yhs-SF01&hspart=Lkry&p=nat+mulcahy+stove+video+world+stove+pup#id=4&vid=ef5fdf411e3bb438af549e55112fb35f&action=view" class="">https://video.search.yahoo.com/yhs/search?fr=yhs-Lkry-SF01&hsimp=yhs-SF01&hspart=Lkry&p=nat+mulcahy+stove+video+world+stove+pup#id=4&vid=ef5fdf411e3bb438af549e55112fb35f&action=view</a> ; </div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>This one looked like TLOD (dark coals)</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">5. 2008 (3:22; by Nat - in English): </div><div class=""> <a href="https://www.youtube.com/watch?v=tfxn5zPz-U0" class="">https://www.youtube.com/watch?v=tfxn5zPz-U0</a> </div><div class=""> (shows two modes) Very good on showing gases in both TLOD and TLUD versions. (Nat uses the term TLOD in text following from 4 years ago in response to a critic who only believed in TLUDs.</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">6. 2008 short </div><div class=""><a href="https://www.youtube.com/watch?v=8Zefrhc8kgM" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>https://www.youtube.com/watch?v=8Zefrhc8kgM</a> </div><div class=""> no flames, but many variations shown. (the term “wick" is here - a central flame blocker)</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">7. 2009 (6:04) </div><div class=""><a href="https://www.youtube.com/watch?v=DdY6CkCILm0" class="">https://www.youtube.com/watch?v=DdY6CkCILm0</a> </div><div class="">emphasis on gasification - not pyrolysis. Very large flames.</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">8. 2010 - Radio interview in Sierra Leone; good only on work in this one country.</div><div class=""><a href="https://www.youtube.com/watch?v=l-5XIFj4HIg" class="">https://www.youtube.com/watch?v=l-5XIFj4HIg</a></div><div class=""> better version at: </div><div class=""><a href="https://www.youtube.com/watch?v=1Y-G8DLLAxc&index=35&list=PU_e0jFpsYy22M4NezF5_M7w" class="">https://www.youtube.com/watch?v=1Y-G8DLLAxc&index=35&list=PU_e0jFpsYy22M4NezF5_M7w</a></div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">7. 2012, 4:18 Radio interview - maybe Sudan?</div><div class=""> <a href="https://www.youtube.com/watch?v=0EflprvOUL0" class="">https://www.youtube.com/watch?v=0EflprvOUL0</a></div><div class=""> Mentions Gates Foundation re water conservation</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">8. 2008 (1:01) Seems similar to one above. But good and short.</div><div class=""><a href="https://www.youtube.com/watch?v=V2VvZVw-XuY&list=PU_e0jFpsYy22M4NezF5_M7w&index=2" class="">https://www.youtube.com/watch?v=V2VvZVw-XuY&list=PU_e0jFpsYy22M4NezF5_M7w&index=2</a></div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">9. On the changes over time in designing the Pup stove:</div><div class=""><a href="https://www.youtube.com/watch?v=onLyRMjEhX4&list=PU_e0jFpsYy22M4NezF5_M7w&index=3" class="">https://www.youtube.com/watch?v=onLyRMjEhX4&list=PU_e0jFpsYy22M4NezF5_M7w&index=3</a></div><div class=""> Nothing on operation -but still one of my favorites. This shows the importance of Nat’s background in consumer appliances.</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">10. Less than a minute - with a brick unit for more flexibility, multiple pots. The only one like this</div><div class=""><a href="https://www.youtube.com/watch?v=qK99va4NwkY&list=PU_e0jFpsYy22M4NezF5_M7w&index=4" class="">https://www.youtube.com/watch?v=qK99va4NwkY&list=PU_e0jFpsYy22M4NezF5_M7w&index=4</a></div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">11. Two very short - showing the two modes</div><div class="">a. <a href="https://www.youtube.com/watch?v=G-gYW1pfOV0&list=PU_e0jFpsYy22M4NezF5_M7w&index=5" class="">https://www.youtube.com/watch?v=G-gYW1pfOV0&list=PU_e0jFpsYy22M4NezF5_M7w&index=5</a></div><div class="">10 seconds - gasification - glowing embers</div><div class=""><br class=""></div><div class="">b. <a href="https://www.youtube.com/watch?v=N2IsGB9hWYs&list=PU_e0jFpsYy22M4NezF5_M7w&index=6" class="">https://www.youtube.com/watch?v=N2IsGB9hWYs&list=PU_e0jFpsYy22M4NezF5_M7w&index=6</a></div><div class="">27 seconds - pyrolytic mode - no glowing</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">12. Earth day 6:04 - non-technical</div><div class=""><a href="https://www.youtube.com/watch?v=DdY6CkCILm0&list=PU_e0jFpsYy22M4NezF5_M7w&index=7" class="">https://www.youtube.com/watch?v=DdY6CkCILm0&list=PU_e0jFpsYy22M4NezF5_M7w&index=7</a></div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">13. 43 secs. Lucia - very blue flames</div><div class=""><a href="https://www.youtube.com/watch?v=z_AFzzTjnoE&index=10&list=PU_e0jFpsYy22M4NezF5_M7w" class="">https://www.youtube.com/watch?v=z_AFzzTjnoE&index=10&list=PU_e0jFpsYy22M4NezF5_M7w</a></div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">14. 4:54 - different type of video short clips during development.</div><div class=""><a href="https://www.youtube.com/watch?v=b43KCPcM6bY&index=11&list=PU_e0jFpsYy22M4NezF5_M7w" class="">https://www.youtube.com/watch?v=b43KCPcM6bY&index=11&list=PU_e0jFpsYy22M4NezF5_M7w</a></div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">15. 42 secs more like a Ppt. biochar oriented</div><div class=""><a href="https://www.youtube.com/watch?v=7pBPRnAh7lw&list=PU_e0jFpsYy22M4NezF5_M7w&index=17" class="">https://www.youtube.com/watch?v=7pBPRnAh7lw&list=PU_e0jFpsYy22M4NezF5_M7w&index=17</a></div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">16. By another person: does good job on differences</div><div class=""><a href="https://www.youtube.com/watch?v=o_o2Lu6YvHc" class="">https://www.youtube.com/watch?v=o_o2Lu6YvHc</a></div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">17. Last: Googling for “Lucia stove” I found this site not produced by Nat: </div><div class=""> <a href="http://geekfun.com/2010/02/16/the-lucia-stoves-coaxial-gasification/" class="">http://geekfun.com/2010/02/16/the-lucia-stoves-coaxial-gasification/</a></div><div class=""> About half way through there are an excellent series of responses and arguments about the Lucia by a correspondent “Matt”. </div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">18. I also found a list of more than 40 short videos produced by Nat - but none as helpful as the above.</div><div class=""><br class=""></div><div class="">Summary: The main thing I learned is that Nat is able now (probably easily) to design for a specific fuel and cooking task (temperature and duration) - but that others will not find it so easy. Not clear yet how Nat is able to also switch (easily?) between gasification (TLUD) and pyrolysis (TLOD). To have some turn down seems to always require a fan/blower.</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>The pyrolysis mode (TLOD) is perhaps capable of getting a higher % char. Somewhere I heard about different Nitrogen retention.</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>I found no indication of how much energy is lost radially, or even how hot the outer wall gets - with either mode.</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>No data found of the type produced by Approvecho and EPA for the Tiers. At one place Nat claimed 93% combustion efficiency. I guess it might be higher, given the operation only in the open and many claims of not smelling anything.</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>I was very surprised to see and hear about so many different World Stove types - for very small to very large.</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Many of the videos had extensive comments below the actual videos. Many are helpful with use of the word Venturi and TLUD/TLOD often. The only alternative to “TLOD” that I found was “pyrolysis” - with a few uses of “Venturi”.</div><div class=""><br class=""></div><div class="">Ron</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>a bit more below.</div><br class=""><div><blockquote type="cite" class=""><div class="">On Apr 1, 2018, at 11:19 AM, alex english <<a href="mailto:aenglish444@gmail.com" class="">aenglish444@gmail.com</a>> wrote:</div></blockquote><blockquote type="cite" class=""><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><br class=""><div class="gmail_extra"><br class=""><div class="gmail_quote">Kirk,</div><div class="gmail_quote">A powerful forced air <span class="" id=":130.2" tabindex="-1" style="">venturi</span> could absolutely pull down on the gasses as you have drawn. He has quite a swirl in that Nova Video. That tall flame is starved for O2 in the center. If there is any mass separation of the gasses by gravity or centrifuge the C02 is heaviest then O2, then N2 and CO. Could they be differentially heated?? I see glowing embers at the edges. The so called flame cap does not extend to the outer edges. It would be very O2 rich there and relatively cold. Some of that could easily end up reacting lower down.</div></div></div></div></blockquote><div><br class=""></div><span class="Apple-tab-span" style="white-space:pre"> </span><b class="">[RWL: No negative comment with this. Somewhere I read that the swirl was not so important. In many of the videos I found above, there is a huge difference between what Nat calls gasification and pyrolysis. So no surprise to see a little glowing when the main action is TLOD. With what Nat called TLUD, the embers were very red.</b></div><div><b class=""><br class=""></b></div><div><b class=""><span class="Apple-tab-span" style="white-space:pre"> </span><br class=""></b><blockquote type="cite" class=""><div class=""><div dir="ltr" class=""><div class="gmail_extra"><div class="gmail_quote"><br class=""></div><div class="gmail_quote">Alex</div></div></div>
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