Mach Diamond Thruster Testing
The test shown above exhibited some melting and erosion of the acoustic cavity dams (as seen with the "sparklers" exiting the thrust chamber). The acoustic cavities were redesigned and testing resumed six days later (below).
MON25/MMH propellants (much faster heating characteristics)
The new acoustic cavities worked flawlessly (no melting or erosion). Excellent post-test condition of the hardware.