What is radian ramjet?

Radian ramjet is a type of air-breathing jet engine used in hypersonic aircraft. It uses the shock waves generated at supersonic speeds to compress and heat the air, which is then mixed with fuel to create thrust. The name "radian" refers to the curved shape of the engine's intake and exhaust, which maximizes the compression and expansion of the air. Radian ramjets are known for their high efficiency and speed, with some designs capable of reaching speeds up to Mach 6 or 7. They are primarily used in military applications such as missiles and drones, but there is ongoing research into using them for commercial supersonic flight.