Keywords: Sikorsky HRS-2 engine HMR-163 MCAS El Toro.jpg A U S Marine Corps Sikorsky HRS-2 from Marine helicopter transport squadron HMR-163 at Marine Corps Air Station El Toro California USA in the early 1950s The open clamshell doors on the nose reveal the 550 hp Pratt Whitney R-1340 engine U S Navy Naval Aviation News November-December 2002 http //www history navy mil/nan/backissues/2000s/2002/nd02/korea pdf s 1950 U S National Museum of Naval Aviation PD-USGov-Military-Navy Sikorsky H-19 United States Marine Corps Pratt Whitney R-1340 Marine Corps Air Station El Toro Marine Medium Tiltrotor Squadron 163 |