Four converted R7V-1 aircraft (BuNos 131630-131631, 131660-131661) with a shorter wingspan and powered by four Pratt & Whitney YT34-P12A turboprop engines. Used by the United States Navy. YC-121F Two R7V-2 aircraft transferred to and used by the United States Air Force and powered by four T34-P-6 turboprops.[7]