Hot-Fire Tests 2007-04-21

Ran the final test with this engine. At the very end of the run, the throat melted out due to what I believe was a sequencing problem which caused LOX to spray on the hot nozzle. One thermocouple was taped down to the outside of the chamber but I think it detached sometime during the run. See the discussion on the main page for more details.

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Run 1 Image

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Death of uncooled engine

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Run 1 Clip

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Run 1 Data

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Melted throat

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Melted throat inside



Hot-Fire Tests 2007-02-25

Ran one test with the new flowmeters. No thermocouples were connected. See the discussion on the main page for more details.

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Run 1 Image

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Run 1 Clip

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Run 1 Data

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Pre-Test



2004-05-17

Added more pictures. In the data plots, the units are:

Tank pressures:          psig
Thrust:                  lbf
Compressed air pressure: psig
Chamber pressure:        psia
Temperatures:            Deg R



Hot-Fire Tests 2004-04-18

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Run 1 Image

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Run 1 Clip

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Run 2 Clip

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Run 1 Data

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Run 2 Data

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Setting up the night before

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Filling kerosene tank

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Last look before the run

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Remote instrumentation

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Test control central

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Filling LOX tank

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After the run

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LOX lines were still cold

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More cold LOX lines

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Test crew

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Lots of soot in there

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My faithful supporters!

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Injector after disassembly

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Cleaned up injector

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Science Fair at work



Cold-Flow Tests 2004-01-26, 2003

The tests with LN2 and water were much more exciting than water alone. I'm sure my neighbors were wondering what I was up to with billowing clouds of cold nitrogen vapor coming out from the open garage!

You can really see the difference between the clogged injector photo and the full open injector with the LN2. Also, note the frost and ice on the top of the tank - you can see where I couldn't get the burst disk holder screwed all the way back in.

I've performed various cold water tests with the injector over a range of pressures. The spray pattern is pretty good. In one case, the o-ring which seals the fuel manifold failed and got stuck in one of the fuel injector orifices. In a live fatal as the corresponding LOX stream would have been left unpaired and may have impinged on the hot chamber wall. Having more pairs would lessen the impact of this type of failure but the holes are already getting pretty small for a 100 lbf thrust engine.

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Cold water test

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O-ring failure

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LN2 test - filling the tank

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LN2 test - injector clogged with ice

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LN2 test - injector free flowing

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LN2 test - iced up fitting

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LN2 test - ball valve