<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">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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