Before Kawasaki's first motorcycle was developed, its aviation engineers were hard at work making cutting-edge aircraft, like World War II's Ki-61 ... just exposing the engine to outside air ...

According to David Myhra, author of a series of books on Germany’s World War II experimental aircraft ... The HWK 109-509 liquid-fuel rocket engine—the same that powered the Messerschmitt ...

Despite having an engine out, no landing gear ... military administrators suddenly discovered they no longer had World War II aircraft for the air museums they were building.

By the end of World War II, a smattering of military ... facing issues with the development of jet engines for their indigenous military aircraft. China’s development of ballpoint pen tips ...