[AR] Re: Thrust Chamber Manufacture
- From: Henry Spencer <hspencer@xxxxxxxxxxxxx>
- To: Arocket List <arocket@xxxxxxxxxxxxx>
- Date: Tue, 11 Aug 2020 15:46:12 -0400 (EDT)
On Mon, 10 Aug 2020, George Herbert wrote:
That said, many many people in group here have designed and built
regeneratively cooled motors either professionally or as amateurs. It’s
different and harder but achievable.
That said :-), I'll repeat a suggestion I've made before: if you really
want to go regenerative, design the plumbing so you can break the fluid
connection between cooling jacket and injector, and do your early runs
with *water* cooling -- lots of water! You can back off on the cooling
flow gradually, once you're getting stable steady-state runs, watching for
chamber damage as you do. When you've got it down to where the numbers
match fuel cooling, *then* you can start running regenerative. This lets
you do your early thermal testing (and any necessary design changes) in a
more forgiving environment, where you don't burn out an expensive chamber
on every run.
Designing your project around the assumption that your very first chamber
will work perfectly is a recipe for disappointment and failure. Look for
ways to work up to your goal gradually.
Henry
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