Here is some more useless or extraneous information regarding ditching. In 1949 when I was attending aircraft mechanics school in Elizabeth City, NC the Coast Guard was developing a standardized ditching procedure. Several years prior to this, the Coast Guard had sold 13-14 HOS-1s to Western Union to be used for line patrol. They proved to be too expensive and were returned to the CG. Each of these helicopters was flown to an altitude of about 1000-1500 feet and autorotated to touchdown in the water. The helicopters were landed at different fuselage attitudes relative to the surface. In most cases after landing the helicopters were rolled to the right in order to separate the blades from the rotorhead. In those days the Sikorsky blades had a singular tubular spar much like a flagpole that had different decreasing diameters from the root to the tip. The blades had internal ribs and were covered in fabric. I believe that this maneuver was performed to prevent rotor incursion or to prevent exiting passengers from being struck by a rotating blade.