In brief: Researchers in China have successfully tested the world's first boron ramjet engine that can operate both in the air and underwater. The engine was originally conceived for hypersonic ...

China has tested a powerful engine that can carry weapons at remarkable speeds through both air and water. The novel engine achieved 90% efficiency in laboratory tests, which were conducted in ...

Smoke billows, and the ground shakes as a howitzer cannon roars to life, launching a 155-millimeter shell into the sky. But this is no ordinary artillery shell—this is the Ramjet 155, a revolutionary ...