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

teststand_regen3_asi_rev_a_mod.pdf

Test Setup - new

testSetupCad.png

Test Setup - original

failsafe1.pdf

Failsafe schematic Sheet 1

failsafe2.pdf

Failsafe schematic Sheet 2

failsafe3.pdf

Failsafe schematic Sheet 3

flowmeterConditioner.png

Flowmeter signal conditioner

fireextfitting.pdf

Fitting for 2.5 gal Fire Extinguisher

burstdiskholder2_base.pdf

Burst Disc Holder Base

burstdiskholder2_cap.pdf

Burst Disc Holder Cap

co2cylinderfitting.pdf

Fitting for 15 lb CO2 Cylinder

test_stand_rocket_assy_1.png

Rocket static test structure



Photos

dsc_2073m.jpg

Fitting for 2.5 gal fire extinguisher

dsc_2043m.jpg

Load cell bracket (new)

testSetupSidePic.jpg

Propellant tank Version 4

testSetupOverallPic.jpg

Test stand (with happy engineer!)

loadCellBracketPic.jpg

Load cell bracket (old)

airValvePic.jpg

Remote controlled ball valve

cryoValvePic.jpg

Cryogenic ball valve

heliumValvePic.jpg

Helium solenoid valve

solenoidValvesPic.jpg

Air solenoid valves

tank1Pic.jpg

Propellant Tank Version 1

tank2Pic.jpg

Propellant Tank Version 2

scubaFitPic.jpg

Scuba tank fitting

propellantTankFitPic.jpg

Propellant tank fitting and burst disk holder

failsafePic.jpg

Failsafe controller

remotePic.jpg

Failsafe remote

p1260003m.jpg

LOX tank fill port

dsc_3206m.jpg

Remote equipment rack

dsc_6481m.jpg

Load cell calibration

DSC_2562m.jpg

Flowmeter parts after failure

dsc_2450m.jpg

Burst disc holder with failed disc

dsc_2454m.jpg

Burst disc holder base

dsc_2455m.jpg

Burst disc holder cap

dsc_2457m.jpg

Commercial burst disc

dsc_2452m.jpg

Failed burst disc

dsc_4698m.jpg

Blast Shield

dsc_4842m.jpg

Chamber thermocouple in Al cap screw

img_1034m.jpg

Plumbing for 250 lbf engine (side)

img_1035m.jpg

Plumbing for 250 lbf engine (front)

img_1036m.jpg

Plumbing for 250 lbf engine (top)