The earlier propellers mentioned above by CV880 (26th Feb 2023, post 31) were Curtiss Electrics (with reversing props), but these must have been replaced by the Ham Standard Hydromatics (also with reversing props) whilst serving with BCPA.in early 1950s. The early DC-6s usually (often?) had twin ADF's (for Automatic Direction Finders so far as I know) which were housed in a distinctive long bulge on lower forward fuselage, port side, as well shown on the very first photograph on this thread.