[chbot] Robotics Group meeting, Monday 20 July 2020, 630pm, 5 Idris Road

Trevor Wignall zl3adz at gmail.com
Tue Jul 21 10:45:12 BST 2020

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.)

On Mon, Jul 20, 2020 at 10:15 PM Robin Gilks <robin at gilks.org> wrote:

> >
> > David Bourke talked about his home-made rocket project, as well as
> > associated adventures. Quite a learning experience for all concerned,
> > and significant progress has been made. Great presentation with photos
> > and videos.
> Just had a better idea - fire cement. Southtile - corner of Annex Rd &
> Nazareth Av - have it in tubs. Good for 1500C and sets really hard without
> much shrinkage. Figure on using it as a thin layer/lining on the nozzles.
> --
> Robin Gilks
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