: Truly amazing. I can't believe the craftsmanship and skill
: involved. I really thought it was all done by machine. It would
: take a lot of work to fair such a large piece. I visited a haul
: out for large ships and stood next to a propeller at least 50
: feet in diameter. Imagine building the plug for one of those.

Some propellers are definitely made with CNC milling machines.
I recall (quite) some years back some sort of espionage issue with 'the other side' trying to get their hands on some hi-tech machinery for milling sub props.
http://americanhistory.si.edu/subs/anglesdangles/taming2.html