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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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