The Bell YOH-4 (originally YHO-4) was a single-engine single rotor light helicopter developed for the United States Army's Light Observation Helicopter program. While the YOH-4A was unsuccessful in the original LOH competition Bell redesigned it as the sleek Bell 206A JetRanger for the commercial market and enjoyed instant and lasting success. In 1967 the Army reopended the LOH competition and the 206A-based OH-58 Kiowa was selected.
Made by Bell Helicopter.
Bell YOH-4 is the predecessor of the Bell 206.