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

[Helmut Walle]

Way OT now, but definitely some good points to consider, Trevor...

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: 
https://www.youtube.com/watch?v=eDNX65d-FBY - the energy source in this 
case is not chemical, but that's a minor technical detail. (:

Kind regards,

Helmut.

On 21/07/2020 21:45, Trevor Wignall wrote:
> 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.)
> Trevor
>
> On Mon, Jul 20, 2020 at 10:15 PM Robin Gilks <robin at gilks.org 
> <mailto: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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