This is supposed to be a Sikorsky R-4, inside a C-47, but however I turn it, it doesn't seem to fit the R-4 shape or structure. Could it be an R-6? Is it perhaps not even a helicopter?

It is one of a set (I think) featuring Sikorsky R-4 helicopters (and NOT R-6 types) being loaded into C-47s
Original caption:
Interior view of Douglas C-47 showing one of helicopters shipped to China from the U.S. The helicopters were being used to rescue personnel who have been forced down or had to bail out in remote and inaccessible areas of China. The planes were equipped with all of the necessary first aid supplies in case the man may be wounded. The helicopter was able to carry one passenger in addition to the pilot. The Air Search and Rescue Section, haeded by Col. Richard W. Treiber, is operated by the 14th A.F. Service Command. (US National Archives)Thanks to Ryan Short for the image, btw.