Has any one seen this engine?
No, it's not missing. We just can't find out what it is other than a YLR-48.
If anyone recognizes it, please let me know. Thanks

Thanks to Vincent Granato for providing this information . . . . .
RMI-RMD's Corvus and Condor involvements were brief. In 1957, the Navy Awarded Temco Aircraft Corporation of Dallas, Texas, the contract for the longrange Corvus XASM-N-8 air-to-surface which was to fly from Navy to Marine Corps carrier-borne aircraft against enemy surface ships or major tactical land targets 75-100 miles (120-160 km) distance. Temco chose RMI (soon to become RMD) as the engine developer, though initial versions of Corvus were apparently fitted with solid motors for aerodynamic and structural tests. For long-term storage aboard ships, RMI designed a rugged, lightweight, storable but packaged liquid propellant system called XLR-48-RM-2, or Patriot. The propellants were completely storable, high-impulse inhibited red fuming nitric acid (IRFNA) and mixed amine fuel (MAP-i), a hypergolic combination. A small turbopump driven by a self-fed gas generator also using IRFNA and MAF-1 forced in the propellants to the regeneratively-cooled chamber. The pump was activated by a solid-propellant (HDAH) starting cartridge. Patriot's thrust was 1,030 lb (458 N) for 177 seconds (three minutes) over an extremely stable burning curve suitable for Corvus' cruising mission. Overall length of this compact engine was 38 in. (96.5 cm), maximum diameter 8.7 in. (22.2 cm), while the principal diameter (chamber) was 5.4 in. (13.7 cm). The overall dry weight was 38.2 lb (17.3 kg). James W. Fitzgerald, who instituted the tradition of assigning names as well as numerical designations to RMI engines, was the Corvus powerplant program manager. A test missile was successfully fired from a Douglas A4D at the Pacific Missile Range on July 18, 1959. Nonetheless, exactly one year later, when $80 million had been expended on the project, Corvus was canceled for then secret reasons. Afterwards, it was disclosed that Corvus was more limited in scope than newer, upcoming Navy missiles.