A rear view of the R-8. Photo probably taken at the Lansdale factory and published in June 1945. Photo from: Kellett

This is the second prototype of the Kellett XR-8, the XR-8A, which had rounded tailfins. It had two-bladed intermeshing rotors first, but these were replaced by three-bladed rotors soon. In a sequence of photos by Rudy Arnold, it is flagged down by a Philadelphia motorcycle cop at a 25 mph speed limit sign - much the same joke as seen in photo 363024. Flying the troublesome Kellett helicopters was not fun at all, but it is not clear when both XR-8s flew for the last time. Photo by: Rudy Arnold / Smithsonian Institution

Kellett helicopter with twin intermeshing rotors. This prototype first flown 7 August 1944. One XR-8 and one XR-8A built. Programme cancelled by US Army in 1946, but at least one of the helicopters was still being flown in 1947. Photo from: Wright State University