A Washington-based firm has flown reusable launch system exceeding Mach 4. The rocket-free reusable launch opens path to affordable, repeatable and scalable hypersonic and suborbital missions.General Hypersonics conducted two launches exceeding Mach 4 from the same reusable launch system, with the second launch occurring approximately 90 minutes after the first. The company claimed that the achievement sets another ram-accelerated mass-to-veloci…