1945 Sikorsky YH-18A, 49-2891

Four produced.

245 hp Franklin O-425-1

First US Army helicopter, based on commercial S-52. One of two converted to XH-39A with 400 hp Turbomèca XT51-T3. the other XH-39A was 49-2890. Then returned to a YH-18A. Was also N7741.