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    Todd,<br>
    <br>
    I remember studying the rotating plate with the differnct sizes of
    holes.  <br>
    <br>
    How does the different size of hole send more air to SA or less to
    PA?  What splits the air flows?   Or is a smaller hole just letting
    less air enter?  <br>
    <br>
    Paul<br>
    <pre class="moz-signature" cols="72">Doc  /  Dr TLUD  /  Prof. Paul S. Anderson, PhD
Email:  <a class="moz-txt-link-abbreviated" href="mailto:psanders@ilstu.edu">psanders@ilstu.edu</a>
Skype:   paultlud    Phone: +1-309-452-7072
Website:  <a class="moz-txt-link-abbreviated" href="http://www.drtlud.com">www.drtlud.com</a></pre>
    <div class="moz-cite-prefix">On 5/1/2017 10:33 AM, Todd Albi wrote:<br>
    </div>
    <blockquote
cite="mid:CAE3shSPeL0fS8u1H_a8UE8AikJmiFkN4c_frA_m0pykUQaQnFg@mail.gmail.com"
      type="cite">
      <meta http-equiv="Content-Type" content="text/html;
        charset=windows-1252">
      <div dir="ltr">Paul:
        <div><br>
        </div>
        <div>There are 2 screws that hold the fan assembly control box
          to front of stove.  The air control is all mechanical, except
          for the actual fan.  You can remove the stove assembly box and
          inspect the rear air couplers that insert into stove body. 
          The knob on the fan assembly rotates a metal plate with
          different size orifices that adjusts SA &PA mixing.  It
          has no impact on the fan speed control, just ventilation
          ratios.  The fan speed control is adjusted with the optional
          PWM that plugs inline between 12 volt DC cord and the box. 
          The PWM is interrupting the electrical signal and adjusts the
          fan speed.</div>
        <div><br>
        </div>
        <div>We have a local city mechanic who pulls their bucket truck
          and forklift bearings with this stove.  We restores antique
          British bikes on weekends.  He throws a metal plate on top of
          the stove and sets bearings on top to heat and release. 
          Recently he showed me a photo of an old Triumph head on the
          heated plate, where in the photo the outer fins of the motor
          cycle were gray and the two cylinders closest to the flame
          were cherry red at exactly at 500 degrees Fahrenheit for
          extraction.  He loves the PWM for fine tune control.  He also
          uses the stove to melt lead for shooting.</div>
        <div><br>
        </div>
        <div>This is our favorite large party wok stove, due to its
          tremendous fire power in a small portable forced air stove
          design.  It is capable of stir frying meat or vegetables for
          large groups very quickly, or reduced to low fire power
          cooking with the PWM option.</div>
        <div><br>
        </div>
        <div><a moz-do-not-send="true"
            href="http://www.silverfire.us/super-dragon-fan-stove">http://www.silverfire.us/super-dragon-fan-stove</a> <br>
        </div>
        <div><br>
        </div>
        <div>Regards,</div>
        <div><br>
        </div>
        <div>Todd Albi, SilverFire</div>
        <div><img src="cid:part2.87B31259.5850AAB1@ilstu.edu"
            height="56" width="444"><br>
          <br>
        </div>
        <div><br>
        </div>
      </div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">On Mon, May 1, 2017 at 8:00 AM, Paul
          Anderson <span dir="ltr"><<a moz-do-not-send="true"
              href="mailto:psanders@ilstu.edu" target="_blank">psanders@ilstu.edu</a>></span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">
            <div bgcolor="#FFFFFF" text="#000000"> Todd,<br>
              <br>
              For those who are not familiar with the mentioned Super
              Dragon TLUD stove, it can be seen at  <br>
              <a moz-do-not-send="true"
                class="m_914875371268085049moz-txt-link-freetext"
                href="http://www.silverfire.us/super-dragon-fan-stove"
                target="_blank">http://www.silverfire.us/<wbr>super-dragon-fan-stove</a>     
              <br>
              <br>
              There is a single knob.   How does that knob change the
              RATIO between the primary air and secondary air (PA and
              SA)?   It is for speed control.   And the PWM is also for
              speed control.   <br>
              <br>
              Paul<br>
              <br>
              <pre class="m_914875371268085049moz-signature" cols="72">Doc  /  Dr TLUD  /  Prof. Paul S. Anderson, PhD
Email:  <a moz-do-not-send="true" class="m_914875371268085049moz-txt-link-abbreviated" href="mailto:psanders@ilstu.edu" target="_blank">psanders@ilstu.edu</a>
Skype:   paultlud    Phone: <a moz-do-not-send="true" href="tel:%28309%29%20452-7072" value="+13094527072" target="_blank">+1-309-452-7072</a>
Website:  <a moz-do-not-send="true" class="m_914875371268085049moz-txt-link-abbreviated" href="http://www.drtlud.com" target="_blank">www.drtlud.com</a></pre>
              <div class="m_914875371268085049moz-cite-prefix">On
                5/1/2017 12:48 AM, Todd Albi wrote:<br>
              </div>
              <blockquote type="cite">
                <div dir="ltr">Ron & Paul:
                  <div><br>
                  </div>
                  <div>What exactly point are you making?  We have a
                    single ventilation knob control on our Super Dragon
                    TLUD fan stove we have been selling since 2012.  It
                    has a single knob that adjusts both primary and
                    secondary air, and is available with an optional
                    pulse width modulator (fan speed control).  Paul has
                    one of these fan stove units, <i>minus the
                      important fan speed control.</i>  He never
                    purchased the inline fan speed control (option) for
                    the stove (only the stove) and he only can control
                    primary & secondary mixing.  That means he
                    cannot maximize low and high fire power cooking
                    control.  The capacity to adjust primary and
                    secondary air and fan speed both are very important.
                     </div>
                  <div><br>
                  </div>
                  <div>The high fire power with out the PWM allows for
                    intense wok cooking, and by reducing the electronic
                    signal with the optional PWM, means canning, waffle
                    making or gourmet salt block grilling are possible.
                    The fan speed control (allows high & low fire
                    power cooking).   Density of fuel is going to result
                    is longer duration of burns in any type of stove
                    (natural draft, fan, rocket or TLUD).  We find that
                    a force fan stove is going to override ventilation
                    inside the combustion chamber to some degree, since
                    air mixing is obviously increased.  This is despite
                    how combustion chamber was packed, since combustion
                    is accelerated with a force air fan.  Density of
                    fuel is going to impact combustion.</div>
                  <div><br>
                  </div>
                  <div>We also offer a TLUD forced fan grill that has 5
                    fan settings (speeds), but no has air mixing
                    control.  The point of the unit is to maximize high
                    temperature searing, due to high cooking
                    temperatures involved, not achievable with standard
                    BBQ grill, that typically only reach 1/2 the
                    grilling temperatures the forced fan grill reaches. 
                    The point is that different stove designs impact the
                    cuisine and type of specific cooking you desire. 
                    Biomass stove designs vary significantly and have
                    multiple pros and cons, depending on the outcome you
                    are trying to achieve (cuisine, fuel use, etc...). 
                    Stove design choice is most important, not hanging
                    your hat on a specific stove design (rocket stove,
                    TLUD, Force Fan stove, or any other design). 
                    Different types of stove designs when used together,
                    can also complement each other.</div>
                  <div><br>
                  </div>
                  <div>For example a natural draft rocket stove used in
                    unison with a natural draft TLUD may be ideal, with
                    the former used to cook your breakfast quickly,
                    while a large a large water bath used for sanitizing
                    drinking water or cookware can sit unattended on the
                    TLUD for long durations, may be ideal in an outdoor
                    kitchen application, using natural draft stoves. 
                    Fan stoves are going to accommodate larger groups of
                    folks, or increase speed of food preparation, if
                    desired.  Each stove design has practical
                    application and merits for the outcome desired.  </div>
                  <div><br>
                  </div>
                  <div>Regards,</div>
                  <div><br>
                  </div>
                  <div>Todd Albi, SilverFire</div>
                  <div><img src="cid:part8.B842200B.F21F357C@ilstu.edu"
                      height="56" width="444"><br>
                    <br>
                  </div>
                  <div><br>
                  </div>
                  <div><br>
                  </div>
                </div>
                <div class="gmail_extra"><br>
                  <div class="gmail_quote">On Sun, Apr 30, 2017 at 9:14
                    PM, Ronal W. Larson <span dir="ltr"><<a
                        moz-do-not-send="true"
                        href="mailto:rongretlarson@comcast.net"
                        target="_blank">rongretlarson@comcast.net</a>></span>
                    wrote:<br>
                    <blockquote class="gmail_quote" style="margin:0 0 0
                      .8ex;border-left:1px #ccc solid;padding-left:1ex">
                      <div style="word-wrap:break-word">
                        <div>Paul and ccs:</div>
                        <div><br>
                        </div>
                        <div><span class="m_914875371268085049m_-5568544863208572952Apple-tab-span" style="white-space:pre-wrap">       </span>I
                          guess I don’t understand “<i>that task that I
                            suggested needs to be researched.”   </i></div>
                        <div><i><br>
                          </i></div>
                        <div><i> <span class="m_914875371268085049m_-5568544863208572952Apple-tab-span" style="white-space:pre-wrap">     </span></i>I
                          contend that changing fuel density should not
                          be an influential property.  </div>
                        <div><br>
                        </div>
                        <div><span class="m_914875371268085049m_-5568544863208572952Apple-tab-span" style="white-space:pre-wrap">       </span>I
                          am not suggesting that you wouldn’t need to
                          change the SA/PA ratio a tad for different
                          fuels.  </div>
                        <div><br>
                        </div>
                        <div><span class="m_914875371268085049m_-5568544863208572952Apple-tab-span" style="white-space:pre-wrap">       </span>Thanks
                          for reminding that the Mini Moto designers
                          seem to be in agreement with me.</div>
                        <div><br>
                        </div>
                        <div>Ron</div>
                        <div><br>
                        </div>
                        <div><br>
                        </div>
                        <br>
                        <div>
                          <blockquote type="cite">
                            <div>On Apr 30, 2017, at 9:46 PM, Paul
                              Anderson <<a moz-do-not-send="true"
                                href="mailto:psanders@ilstu.edu"
                                target="_blank">psanders@ilstu.edu</a>>
                              wrote:</div>
                            <br
class="m_914875371268085049m_-5568544863208572952Apple-interchange-newline">
                            <div>
                              <div bgcolor="#FFFFFF" text="#000000">
                                Ron,<br>
                                <br>
                                A single controller (that does not allow
                                for changing the ratio and amount of air
                                to  PA and SA) is, by definition, unable
                                to do that task that I suggested needs
                                to be researched.<br>
                                <br>
                                And there certainly are SINGLE controls
                                since the Woodgas campstove had 2
                                settings, and now Mimi-Moto has a dial
                                with about 5 settings, but no change of
                                ratio.<br>
                                <br>
                                Paul<br>
                                 <br>
                                <pre class="m_914875371268085049m_-5568544863208572952moz-signature" cols="72">Doc  /  Dr TLUD  /  Prof. Paul S. Anderson, PhD
Email:  <a moz-do-not-send="true" class="m_914875371268085049m_-5568544863208572952moz-txt-link-abbreviated" href="mailto:psanders@ilstu.edu" target="_blank">psanders@ilstu.edu</a>
Skype:   paultlud    Phone: <a moz-do-not-send="true" href="tel:%28309%29%20452-7072" value="+13094527072" target="_blank">+1-309-452-7072</a>
Website:  <a moz-do-not-send="true" class="m_914875371268085049m_-5568544863208572952moz-txt-link-abbreviated" href="http://www.drtlud.com/" target="_blank">www.drtlud.com</a></pre>
                                <div
                                  class="m_914875371268085049m_-5568544863208572952moz-cite-prefix">On
                                  4/30/2017 5:13 PM, Ronal W. Larson
                                  wrote:<br>
                                </div>
                                <blockquote type="cite">
                                  <div>Paul,  List and ccs:</div>
                                  <div><br>
                                  </div>
                                  <div><span class="m_914875371268085049m_-5568544863208572952Apple-tab-span" style="white-space:pre-wrap">     </span>Well
                                    I haven’t heard a reason why my
                                    yesterday statement on only needing
                                    a single controller (limiting fuels
                                    to the non-oily variety) was
                                    incorrect.  </div>
                                  <div><br>
                                  </div>
                                  <div><span class="m_914875371268085049m_-5568544863208572952Apple-tab-span" style="white-space:pre-wrap">     </span>This
                                    is to hope we can have more
                                    discussion on this quite important
                                    point.  </div>
                                  <div><br>
                                  </div>
                                  <div><span class="m_914875371268085049m_-5568544863208572952Apple-tab-span" style="white-space:pre-wrap">     </span>I
                                    am quite sure I saw a TLUD design a
                                    few years ago that used a single air
                                    control.  Anyone able to help?</div>
                                  <div><br>
                                  </div>
                                  <div><span class="m_914875371268085049m_-5568544863208572952Apple-tab-span" style="white-space:pre-wrap">     </span>I
                                    don’t know anything about Nathan
                                    Puffer’s work.</div>
                                  <div><br>
                                  </div>
                                  <div>Ron</div>
                                  <div><br>
                                  </div>
                                  <br>
                                  <div>
                                    <blockquote type="cite">
                                      <div>On Apr 29, 2017, at 9:33 PM,
                                        Paul Anderson <<a
                                          moz-do-not-send="true"
                                          href="mailto:psanders@ilstu.edu"
                                          target="_blank">psanders@ilstu.edu</a>>
                                        wrote:</div>
                                      <br
class="m_914875371268085049m_-5568544863208572952Apple-interchange-newline">
                                      <div>
                                        <div bgcolor="#FFFFFF"
                                          text="#000000"> Ron,<br>
                                          <br>
                                          I disagree.   You wrote:
                                          <blockquote type="cite">preferring
                                            to use one controller for
                                            both is that the ratio of
                                            primary to secondary should
                                            always be the same </blockquote>
                                          The point is that the ratio is
                                          NOT to always be the same.  
                                          Even the different packing of
                                          the fuel in to the TLUD can
                                          make primary air (PA) flow
                                          more easily, creating more
                                          gases and needing a change in
                                          secondary air (SA) to get
                                          optimal performance.<br>
                                          <br>
                                          Automobiles have sensors for
                                          all kinds of issues, with
                                          automated adjustments.   Just
                                          not practical yet for
                                          cookstoves that need to be
                                          inexpensive.  Bu who knows,
                                          someday solid biomass as
                                          initial fuel could be
                                          pyrolyzed and have the gases
                                          combusted in very controlled
                                          ways that would seem like
                                          Science Fiction if said
                                          today.  I believe that it will
                                          be justified for the
                                          woodgas/TLUD stoves, but not
                                          for the old-hat ICS stoves,
                                          including rockets.<br>
                                          <br>
                                          Nathan Puffer''s work was not
                                          quantitatively evaluated.   It
                                          was a demonstration that made
                                          its point but was not in a way
                                          that could be into large
                                          numbers of stoves at that time
                                          and still today.  <br>
                                          <br>
                                          Paul<br>
                                          <br>
                                          <br>
                                          <br>
                                          <br>
                                          <pre class="m_914875371268085049m_-5568544863208572952moz-signature" cols="72">Doc  /  Dr TLUD  /  Prof. Paul S. Anderson, PhD
Email:  <a moz-do-not-send="true" class="m_914875371268085049m_-5568544863208572952moz-txt-link-abbreviated" href="mailto:psanders@ilstu.edu" target="_blank">psanders@ilstu.edu</a>
Skype:   paultlud    Phone: <a moz-do-not-send="true" href="tel:%28309%29%20452-7072" value="+13094527072" target="_blank">+1-309-452-7072</a>
Website:  <a moz-do-not-send="true" class="m_914875371268085049m_-5568544863208572952moz-txt-link-abbreviated" href="http://www.drtlud.com/" target="_blank">www.drtlud.com</a></pre>
                                          <div
                                            class="m_914875371268085049m_-5568544863208572952moz-cite-prefix">On
                                            4/29/2017 9:46 PM, Ronal W.
                                            Larson wrote:<br>
                                          </div>
                                          <blockquote type="cite">
                                            <div>Paul,  cc Nathan and
                                              list</div>
                                            <div><br>
                                            </div>
                                            <div><span class="m_914875371268085049m_-5568544863208572952Apple-tab-span" style="white-space:pre-wrap">   </span>Thanks
                                              for bringing up the two
                                              subjects of a)  separately
                                              controlling secondary air,
                                              and b) oily (mostly seed?)
                                               fuels.</div>
                                            <div><br>
                                            </div>
                                            <div><span class="m_914875371268085049m_-5568544863208572952Apple-tab-span" style="white-space:pre-wrap">   </span>I
                                              agree that we should be
                                              controlling secondary air,
                                              but I am pretty sure that
                                              we should and can do this
                                              with the same controller
                                              as for the primary air. 
                                              Most TLUDs already can and
                                              should control primary
                                              air, but make no effort to
                                              control the secondary air.
                                                My reason for preferring
                                              to use one controller for
                                              both is that the ratio of
                                              primary to secondary
                                              should always be the same
                                              if we want (or can live
                                              with) a fixed ratio for
                                              excess air.   One
                                              controller is cheaper and
                                              is easier for the cook.  
                                              Anyone disagree?</div>
                                            <div><br>
                                            </div>
                                            <div><span class="m_914875371268085049m_-5568544863208572952Apple-tab-span" style="white-space:pre-wrap">   </span>On
                                              the subject of using
                                              Jaropha seeds,  I am
                                              pretty sure that we would
                                              need a larger amount of
                                              “secondary” air than for
                                              non-oily fuels, but that
                                              there still could be a
                                              single air controller
                                              (just with a larger SA/PA
                                              ratio  [ maybe goes from
                                              about 6:1 up to 7:1 ??]. 
                                              Note that these oils
                                              cannot combust as they
                                              pass through the hot
                                              charcoal above the
                                              downward moving pyrolysis
                                              front (no oxygen in that
                                              stream).  But I presume
                                              the temperature is enough
                                              for them to arrive above
                                              the char as quite a
                                              different set of gases. 
                                              So,  I’d like to hear more
                                              about what Nathan found. 
                                              Any cite we can look up?</div>
                                            <div><br>
                                            </div>
                                            <div><span class="m_914875371268085049m_-5568544863208572952Apple-tab-span" style="white-space:pre-wrap">   </span>I
                                              agree with the rest of
                                              Paul’s comments.  TLUDs
                                              are not yet a mature
                                              technology - but it is
                                              growing up;  it is not
                                              standing still.</div>
                                            <div><br>
                                            </div>
                                            <div>Ron</div>
                                            <div><br>
                                            </div>
                                            <br>
                                            <div>
                                              <blockquote type="cite">
                                                <div>On Apr 29, 2017, at
                                                  8:14 AM, Paul Anderson
                                                  <<a
                                                    moz-do-not-send="true"
href="mailto:psanders@ilstu.edu" target="_blank">psanders@ilstu.edu</a>>
                                                  wrote:</div>
                                                <br
class="m_914875371268085049m_-5568544863208572952Apple-interchange-newline">
                                                <div>
                                                  <div bgcolor="#FFFFFF"
                                                    text="#000000"> To
                                                    all,               
                                                       29 April 2017    
                                                    [This note contains
                                                    some new content and
                                                    explanations for the
                                                    advancement of TLUD
                                                    stoves.]<br>
                                                    <br>
                                                    1.  Ron:    I and
                                                    probably some others
                                                    have successfully
                                                    used dung as the
                                                    input fuel into
                                                    TLUDs.    I am not
                                                    recommending dung,
                                                    but if it is being
                                                    burned, then a TLUD
                                                    is preferred for
                                                    cleaner burning.<br>
                                                    <br>
                                                    2.  AD:   I agree
                                                    with Ron that the
                                                    TLUD stoves are
                                                    better with both
                                                    light and hard
                                                    (heavy) wood than
                                                    direct burning of
                                                    them in any
                                                    direct-burning (ICS)
                                                    stove.<br>
                                                    <br>
                                                    3.  Main point, to
                                                    Neil and all:  
                                                    TLUDs are not
                                                    burning wood
                                                    directly.   TLUDs
                                                    turn wood into
                                                    gases.   THEN the
                                                    gases are burned.  
                                                    So poplar, maple,
                                                    maize cobs, dung,
                                                    etc. are ALL
                                                    becoming gases
                                                    first.   THEN the
                                                    burning of those
                                                    gases might be
                                                    somewhat different
                                                    (but not as much as
                                                    the direct burning
                                                    of those diverse
                                                    fuels).  <br>
                                                    <br>
                                                    TLUD stoves are just
                                                    arriving into their
                                                    "young-adult
                                                    stage."   In
                                                    contrast:  not
                                                    infancy, not
                                                    childhood, maybe
                                                    still "youth", but
                                                    certainly not full
                                                    maturity, and a long
                                                    way from  the "old
                                                    age" of the ICS
                                                    "Inproved or
                                                    Inadequate"
                                                    direct-burning
                                                    cookstoves.  This is
                                                    because we are still
                                                    learning about
                                                    better and better
                                                    ways of mixing the
                                                    combustible gases
                                                    with  the incoming
                                                    secondary air (SA) 
                                                    (This is where the
                                                    BURNING takes place
                                                    to make the heat
                                                    that goes to the
                                                    pot.  TLUDs are
                                                    DIRECTLY burning
                                                    GASES, not solid
                                                    fuels. )    (Please
                                                    see my
                                                    "Classification of
                                                    Stove Technology and
                                                    Fuels" documents
                                                    (1-page and 4-page
                                                    versions) at  <a
                                                      moz-do-not-send="true"
class="m_914875371268085049m_-5568544863208572952moz-txt-link-freetext"
href="http://www.drtlud.com/2017/04/11/classification-stove-technologies-fuels/"
                                                      target="_blank">http://www.drtlud.com/2017/04/<wbr>11/classification-stove-techno<wbr>logies-fuels/</a> 
                                                    )<br>
                                                    <br>
                                                    The <u>solid </u>wood
                                                    and dung etc are an
                                                    intermediate stage
                                                    of the fuel.   Sort
                                                    of a "storage"
                                                    stage.  Then
                                                    pyrolysis
                                                    "transforms solids
                                                    into gases plus
                                                    charcoal".  The
                                                    created gases are
                                                    then burned
                                                    SEPARATELY (by
                                                    centimeters and
                                                    seconds, but
                                                    certainly
                                                    separately) from
                                                    where the gases were
                                                    created.  We do not
                                                    have clear
                                                    terminology for
                                                    this, in layman's
                                                    terms.  The closest
                                                    might be "gas
                                                    burning stoves that
                                                    make their own
                                                    gases."  <br>
                                                    <br>
                                                    So, what development
                                                    is happening in the
                                                    early "young-adult"
                                                    stage?  Control of
                                                    primary air,
                                                    learning about solid
                                                    "intermediate"
                                                    fuels, and improving
                                                    combustion of the
                                                    gases, as well as
                                                    "new clothes" with
                                                    sizes and mateials. 
                                                    <br>
                                                    <br>
                                                    Consider this:  We
                                                    have known of FA
                                                    (forced air or fan
                                                    assisted) TLUD
                                                    stoves from the
                                                    1990s.  And there
                                                    has been much
                                                    progress.  But NO
                                                    TLUD on the market
                                                    has SEPARATE
                                                    controls for
                                                    "variable flows" of
                                                    primary air (PA) and
                                                    secondary air
                                                    (SA).   THAT control
                                                    is what will make
                                                    the difference
                                                    regarding Neil's
                                                    initial question
                                                    that pointed to
                                                    differences in the
                                                    initial fuels (and
                                                    therefore
                                                    differences in the
                                                    resultant gases and
                                                    quantities of gases
                                                    that are being
                                                    burned.)  <br>
                                                    <br>
                                                    Note that TLUDs can
                                                    be made with
                                                    different flows of
                                                    PA ans SA by
                                                    changing the sizes
                                                    and number of
                                                    holes.  That is a
                                                    form of "tuning" the
                                                    TLUD for a specific
                                                    fuel.   This works
                                                    great for one
                                                    initial fuel, but
                                                    only good but
                                                    acceptable with
                                                    other fringe fuels. 
                                                    I am NOT referring
                                                    to that work as
                                                    being "variable
                                                    flows".   I am
                                                    referring to when
                                                    the user can change
                                                    the flows, even
                                                    during one batch of
                                                    fuel.<br>
                                                    <br>
                                                    There has been some
                                                    researach (mostly
                                                    unreported and set
                                                    aside) on variable
                                                    control of primary
                                                    and secondary air,
                                                    using fans.  I have
                                                    experimented several
                                                    times.  The
                                                    "million-dollar-grants"
                                                    have had laboratory
                                                    equipment with
                                                    controlled and
                                                    measured separate
                                                    air flows.  Nathan
                                                    Puffer did it when
                                                    we were looking at
                                                    Jatropha SEEDS as a
                                                    fuel.  Seeds give
                                                    off additional gases
                                                    from the
                                                    vaporization (not
                                                    pyrolysis) of
                                                    combustible
                                                    vegetable oils
                                                    (carbohydrates),
                                                    which are much more
                                                    plentiful in seeds
                                                    than in stems and
                                                    branches and leaves,
                                                    thereby overwhelming
                                                    the insufficient
                                                    supply of SA in a
                                                    "regular" TLUD-FA. <br>
                                                    <br>
                                                    There is a good
                                                    reason to not have
                                                    separate control of
                                                    PA and SA.   That
                                                    reason is the user,
                                                    the cook.  To need
                                                    to "dial-in" the
                                                    right flow of SA
                                                    (assuming PA flow
                                                    stays the same) is,
                                                    for the most part
                                                    and for most
                                                    non-scientist cooks,
                                                    an extra task that
                                                    could easily be done
                                                    incorrectly.  And
                                                    there are the
                                                    financial reasons of
                                                    increased cost and
                                                    maintenance.   <br>
                                                    <br>
                                                    But with "separate
                                                    air-flow control"
                                                    (not an established
                                                    term and NOT
                                                    justifying an
                                                    acronym like SAC, as
                                                    in TLUD-SAC), Neil
                                                    or anyone could put
                                                    many very different
                                                    initial fuels into a
                                                    TLUD and have
                                                    greater control of
                                                    the burning of the
                                                    gases.  <br>
                                                    <br>
                                                    More work is needed
                                                    before TLUD stoves
                                                    can reach their full
                                                    potential, while
                                                    growing in
                                                    "young-adulthood". 
                                                    Today (2017), maybe
                                                    40% of what can be
                                                    known about TLUD
                                                    stoves is now known
                                                    (but not necessarily
                                                    put into practice by
                                                    stove
                                                    manufacturers).  <br>
                                                    <br>
                                                    (This note is being
                                                    placed at the EPosts
                                                    section of my
                                                    website  <a
                                                      moz-do-not-send="true"
class="m_914875371268085049m_-5568544863208572952moz-txt-link-abbreviated"
href="http://www.drtlud.com/" target="_blank">www.drtlud.com</a>   so
                                                    that it can  be
                                                    accessed continually
                                                    instead of only one
                                                    time on the Stove
                                                    Listserv.) <br>
                                                    <br>
                                                    Paul<br>
                                                    <pre class="m_914875371268085049m_-5568544863208572952moz-signature" cols="72">Doc  /  Dr TLUD  /  Prof. Paul S. Anderson, PhD
Email:  <a moz-do-not-send="true" class="m_914875371268085049m_-5568544863208572952moz-txt-link-abbreviated" href="mailto:psanders@ilstu.edu" target="_blank">psanders@ilstu.edu</a>
Skype:   paultlud    Phone: <a moz-do-not-send="true" href="tel:%28309%29%20452-7072" value="+13094527072" target="_blank">+1-309-452-7072</a>
Website:  <a moz-do-not-send="true" class="m_914875371268085049m_-5568544863208572952moz-txt-link-abbreviated" href="http://www.drtlud.com/" target="_blank">www.drtlud.com</a></pre>
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