Hardware: Cygnus Pressurized Cargo Module, SAFFIRE · Program: Cygnus Spacecraft · Fuel phase: Solid · DOI 10.60555/2chp-m469
Objective
The objectives of SAFFIRE-II are to determine how rapidly a large scale fire grows in low-gravity and to investigate the low-g flammability limits compared to those obtained in NASA’s normal gravity material flammability screening test.
SAFFIRE-II (PSI-99, Cygnus Pressurized Cargo Module, SAFFIRE, Cygnus Spacecraft). 9 test runs from NASA PSI (DOI 10.60555/2chp-m469).
Metadata Completeness
33%
Share of key conditions (oxygen, pressure, airflow) reported in the source tables.
Representative Conditions
Median of the values reported across this investigation's test runs.
- Fuel / Material
- Silicone, SIBAL cotton-fiberglass, PMMA
- Gravity
- 0 g (microgravity, ISS / Cygnus flight)
- Airflow-Equivalent Gravity
- 9 of 9 runs, ~0.38 g (9)
- Oxygen Concentration
- Not reported
- Ambient Pressure
- Not reported
- Airflow Velocity
- 0.2 m/s
The PSI record mentions both flight and ground work; 0 g reflects its ISS / Cygnus flight metadata.
Findings summary
9 test runs recorded; 20.0–20.0 cm/s (n=9); microgravity (0 g, ISS / Cygnus flight); 9 runs have airflow comparable to partial-gravity buoyancy.
Source: NASA PSI PSI-99: PSI-99_Experimental table_SAFFIRE-2.csv (psi.nasa.gov). File, sheet and row are listed per test run below.
Experiment Design: Held Constant vs Varied
What stayed fixed across test runs, what was changed, and what was measured, from the NASA test tables.
Experimental table SAFFIRE-2 · 11 runs · 2 held constant · 7 varied · 5 measured
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Instrument and imaging settings (2)
- Camera 1
- Camera 2
Test Runs (9)
Conditions and measurements for each run. Open a run to see every value and its source row.
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