China has developed a contra-rotary ramjet engine that enables seamless flight from standstill to hypersonic speeds.

Jianzhong stated the contra-rotary compressor is the main innovation behind the system’s architecture. Because the high- and low-pressure rotors spin in opposite ways, the engine maintains relative speed and reduces absolute rotational speed, thus lowering centrifugal forces on blades and discs.

Well that’s interesting

centrifugal forces

🤔

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