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The Lockheed Martin SR-72's engine design is shrouded in secrecy, but here's what we can glean from publicly available information: Hypersonic Goal: The SR-72 aims to achieve hypersonic speeds exceeding Mach 6, requiring an engine that can function efficiently across vast speed ranges – subsonic, supersonic, and hypersonic. Combined Cycle Engine (likely): Experts believe the SR-72 will utilize a Turbine-Based Combined Cycle (TBCC) engine. This combines two engines: Turbine Engine: Provides power for low-speed flight and initial acceleration. Scramjet Engine: Takes over at high speeds for hypersonic flight. Scramjets function by using supersonic airflow for combustion, eliminating the need for bulky compressors, making them ideal for hypersonic speeds. Development Collaboration: Lockheed Martin reportedly collaborated with Aerojet Rocketdyne on a scramjet-based design for the SR-72. However, specifics remain classified. Challenges and Uncertainties: Developing a scramjet engine that seamlessly integrates with a turbine engine and functions efficiently across various speed regimes is a significant technical hurdle. There haven't been any official announcements about the SR-72's development progress since 2018, leading some to believe the project might be on hold or facing delays. Overall, the SR-72's engine design is a fascinating mystery. While the TBCC concept with a scramjet seems likely, specifics remain under wraps. The project's future development and timeline are also uncertain. #johnmoody #SR72
