The General Electric J31 is a turbojet engine developed in the late 1940s. It was designed for use in military aircraft, particularly the McDonnell F2H Banshee. The J31 was notable for its compact size and lightweight design, which contributed to improved aircraft performance. This engine was one of the early models in the General Electric turbojet family and played a role in advancing jet propulsion technology. Its development marked a significant step in the evolution of jet engines, paving the way for more powerful and efficient designs in subsequent years.