Note: The text below applies to the test stand used for the original uncooled engine. Information about updates for the more recent testing is in the News section.
The test stand has taken way more time to put together than I
imagined. In fact, it's taken about 5X more time than the design
and fabrication of the uncooled engine.
I finally finished the failsafe control unit. It's purpose is
to control the various remote devices (relays, solenoids, ignitor,
etc.) during the test. It also provides for a remote control box
that includes a dump switch and some status indicators. The card
interfaces to a National Instruments PXI-6527 isolated DIO board
and will be controlled by the test program in LabVIEW.
I used Eagle Schematic for the
drawings. It runs in Linux and Windows and they also have a free
version (which I'm using). I have hand sketches of the overall
instrumentation setup which I'll convert over to Eagle when I get
some more time.
I added a separate fill port to the LOX tank to make it easier
to get it closed back up after filling based on my tests with
LN2. The internal threads on the tank got iced up real bad and I
couldn't thread the burst disk fitting back all the way in. The
new tube connector has external threads on the top so it is much
easier to cap it off after I'm done filling it.
Drawings
Test Setup - new
Test Setup - original
Failsafe schematic Sheet 1
Failsafe schematic Sheet 2
Failsafe schematic Sheet 3
Flowmeter signal conditioner
Fitting for 2.5 gal Fire Extinguisher
Burst Disc Holder Base
Burst Disc Holder Cap
Fitting for 15 lb CO2 Cylinder
Rocket static test structure
Photos
Fitting for 2.5 gal fire extinguisher
Load cell bracket (new)
Propellant tank Version 4
Test stand (with happy engineer!)
Load cell bracket (old)
Remote controlled ball valve
Cryogenic ball valve
Helium solenoid valve
Air solenoid valves
Propellant Tank Version 1
Propellant Tank Version 2
Scuba tank fitting
Propellant tank fitting and burst disk holder
Failsafe controller
Failsafe remote
LOX tank fill port
Remote equipment rack
Load cell calibration
Flowmeter parts after failure
Burst disc holder with failed disc
Burst disc holder base
Burst disc holder cap
Commercial burst disc
Failed burst disc
Blast Shield
Chamber thermocouple in Al cap screw
Plumbing for 250 lbf engine (side)
Plumbing for 250 lbf engine (front)
Plumbing for 250 lbf engine (top)
Blast deflector for vertical testing
Vertical test structure
Vertical test structure engine mount
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