The LE-7 is a liquid rocket engine developed by Mitsubishi Heavy Industries for use in the H-IIA and H-IIB launch vehicles. It operates on a combination of liquid oxygen and kerosene, providing a high thrust-to-weight ratio, which makes it suitable for launching payloads into space. This engine features a staged combustion cycle, enhancing its efficiency and performance. The LE-7 has been instrumental in Japan's space exploration efforts, contributing to various satellite launches and missions since its first flight in 2001. Its design reflects advancements in rocket technology, showcasing Japan's capabilities in aerospace engineering.