Half Cat Static Test 3 - February 25, 2021

• Success

• No numerical data acquired

• Changes from previous test: New fitting-based injector, copper nozzle, replacement of bolted retainer tail-cone with regular bolted retainer due to concerns of gross overexpansion

Had the data acquisition system been working, this test fire would have qualified the engine for flight. The lingering fire appeared again in this test, however it eventually snuffed itself out. This is believed to be the CHAMBERSAFE, which is normally self-extinguishing in atmosphere thanks to the release of H2O and CO2, being fed by residual nitrous oxide. A reflection inside the camera lens provided a good view of the Mach diamonds retreating as the combustion pressure decayed.