Keywords: XHRP-1 static model NAN4-47.jpg A U S Navy Piasecki XHRP-1 helicopter without skin in 1946-47 U S Navy Naval Aviation News April 1947 http //www history navy mil/nan/backissues/1940s/1947/Apr47 pdf 1946-47 USN PD-USGov-Military-Navy Piasecki HRP Rescuer |