Trajanus
Paranormal Adept
I wasn't talking airships. I was thinking of a number of ufo sightings where propellers appear on the outside of the ship. I would suggest their value for intergalactic travel is nebulous at best.
First who says EVERY alien craft has to be capable of interstellar travel?? Many could be small scout craft.
Pulleys, beer can aliens, flying hotels, giant tanks, ships with pulleys, robots who try and gey humans out of trees, aliens in the shape of eyeballs and the list goes on of ridiculous imagery that appears to be internally generated at best. It fits the IP theory well.
Concerning "robots who try and gey humans out of trees" I very much doubt Shrum, who desperately battled them, thought they were "internally generated." I don't doubt a lot of things observed seem ridiculous for a spacefaring system. But in light of its obvious unwillingness to be revealed openly, it wouldn't be at all surprising if it often WANTS to appear ridiculous, to prevent general acceptance of its reality.