Ad for S-61 with Gnome engines, sorry about the size.
Vince Johnson - A merciless enemy but a powerful ally.
Recent evidence provided by Maveric seems to point to a very different allocation of Sikorsky's S-46 to S-48 designations. This leads to the following modified list:
Considering the overall quality and reliability of the source, I'm strongly inclined to believe that the above is correct.In that case, the following designations would remain a follows:
Same source (attached image) also clearly gives the V-tailed flying crane project as the S-63. However, other sources suggest the HLH contender was the S-73, not the S-63. This seems coherent with the fact that it is a development of the S-64 and should therefore be a later project with later (not preceding) designation. Besides, other artwork of the very same project is dated 1970.Still, the seemingly "final" Sikorsky HLH shows a very different shape. So either the first configuration (based on the DS-103 design) was S-63 and the final version were S-73, or they were all S-73 and S-63 was the S-62B as has previously been said.