The General Electric J85 is regarded as one of the most powerful and compact jet engines ever built. It was originally designed as a military engine for use in fighter jets in the 1950s and has since been used in a variety of applications, including unmanned aerial vehicles (UAVs) and cruise missiles.
Despite its small size, the J85 can generate up to 5,000 pounds of thrust and propel aircraft at speeds of up to Mach 1.3. Its small size and high thrust-to-weight ratio make it ideal for small, agile aircraft. The J85 has been a popular choice for military and commercial applications, and it has helped to shape modern jet engine technology.