The I-400 submarine was a groundbreaking marvel—an underwater aircraft carrier built by Japan during WWII to launch surprise ...

The I-400 was Japan’s secret weapon—an underwater aircraft carrier built to strike distant targets during WWII. Capable of launching bombers from beneath the sea, it was the largest submarine of its ...

GPUs use a network of generators and frequency converters to supply aircraft with 400 Hz power during ground testing. That’s necessary so that technicians can simulate in-flight conditions while they ...