ACE is a unique large-scale continuously variable Mach number (5-8) facility developed at TAMU to study turbulent and transitional flows using modern laser diagnostics. The Reynolds number range is 0.5 – 7.0 million per meter. The nozzle exit is 0.23 m x 0. 36 m; the run time is 40 sec, and the duty cycle is 2.5 hours.