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    <p>Way OT now, but definitely some good points to consider,
      Trevor...</p>
    <p>And yes, liquid fuel cooling is an established way of keeping the
      nozzles cool. I found this an equally informative and enjoyable
      documentary straight from one of the several horses' mouth:
      <a class="moz-txt-link-freetext" href="https://www.youtube.com/watch?v=eDNX65d-FBY">https://www.youtube.com/watch?v=eDNX65d-FBY</a> - the energy source in
      this case is not chemical, but that's a minor technical detail. (:</p>
    <p>Kind regards,</p>
    <p>Helmut.<br>
    </p>
    <div class="moz-cite-prefix">On 21/07/2020 21:45, Trevor Wignall
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAJKUhDPLMm6eGPfbNWswNe31BYiFr8HQKML2eSk3xA7hWyrbHg@mail.gmail.com">
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      <div dir="ltr">The fire cement is likely to flake off if it is
        applied to a metal with a high temperature coefficient of
        expansion. The aluminium is also likely to melt if the heat is
        applied for too long - unless you add cooling tubes. (I believe
        most liquid fuelled rockets use the fuel for cooling the
        nozzles.)
        <div>Trevor</div>
      </div>
      <br>
      <div class="gmail_quote">
        <div dir="ltr" class="gmail_attr">On Mon, Jul 20, 2020 at 10:15
          PM Robin Gilks <<a href="mailto:robin@gilks.org"
            moz-do-not-send="true">robin@gilks.org</a>> wrote:<br>
        </div>
        <blockquote class="gmail_quote" style="margin:0px 0px 0px
          0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">><br>
          > David Bourke talked about his home-made rocket project,
          as well as<br>
          > associated adventures. Quite a learning experience for
          all concerned,<br>
          > and significant progress has been made. Great
          presentation with photos<br>
          > and videos.<br>
          <br>
          Just had a better idea - fire cement. Southtile - corner of
          Annex Rd &<br>
          Nazareth Av - have it in tubs. Good for 1500C and sets really
          hard without<br>
          much shrinkage. Figure on using it as a thin layer/lining on
          the nozzles.<br>
          <br>
          <br>
          -- <br>
          Robin Gilks<br>
          <br>
          <br>
          <br>
          <br>
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