The H-1 rocket engine was an important part of the Saturn 1 and Saturn 1B rockets. These rockets were used in the early days of space travel to help get ready for the Apollo missions, which sent astronauts to the Moon. Each Saturn 1 and Saturn 1B rocket had eight H-1 engines that helped launch them into space!
A company called Rocketdyne made the H-1 engine for NASA. It was really powerful because it burned a special fuel called RP-1, which is like kerosene, along with liquid oxygen. This engine created 188,000 pounds of thrust, which is a lot of power to send rockets into space.
The H-1 engine was used in missions like Apollo 7 in 1968 and the Skylab space station missions in the 1970s.