Engine test #2 CAD

November 25th, 2008 raindrift Posted in cad, Hitodama, make 2,294 Comments »

Nicole, Jonathan and I spent the evening finishing up the design for Hitodama test engine #2.  It’s a cool-running liquid propane/compressed air thruster, with a theoretical thrust of 96 Newtons.  We’re opting for safety over performance, which means low combustion chamber temperatures and lots of air pressure.  The complete engine, including bolt flanges, is 9cm diameter.  Hopefully we’ll be able to reduce that slightly for the production version.  A complete set of design specifications should be forthcoming.

Next come the high-pressure air and nitrogen-pushed propane systems.  Just because we said it’s safe doesn’t mean it’s simple…

Hitodama test engine #2

This is a picture of the complete engine.  From left to right, you see the nozzle (including diverging and converging sections), the combustion chamber which contains a titanium flame holder, the fuel injector, and the injector cap.  Air and propane enter and mix inside the flame holder.  Meanwhile, a bunch more air is injected outside the flame holder.  The entire mass of combustion gases are heated to about 1000C, and ejected from the engine at Mach 2.5.  At least, in theory.  We still have to build it.

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