[AR] Re: Electroforming Experiment
- From: Ed LeBouthillier <codemonky@xxxxxxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Fri, 12 Jul 2019 20:07:04 -0700
On Fri, 2019-07-12 at 15:01 -1000, David Summers wrote:
That looks really good! How complex is the design? Are you leaving
the chamber walls that thin?
This was just a first experiment. I wanted to establish the rate of
deposit. My goal will be 0.015" wall thickness, 0.015" cooling channel
thickness and 0.015" closeout thickness, for a total thickness of
0.045" inches. At my current amperage level, that'll take a 60 hours
per layer (per 0.015"), or about 240 hours total. There is some benefit
to plating slower; the quality of the deposition is better. If one
increases the amperage, then spikes and trees will form. I had no
spikes or trees so I feel that I shouldn't try to speed things along.
The design was pretty simple. My goal is to test it with Butane and Gox
at about 70 PSI. It should produce about 5 pounds of thrust (presuming
the combustion is smooth enough). This first engine is intended to be
water cooled to establish heat flux. I'm currently not optimistic about
closing the regeneration cycle, but I'll know more after testing.
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