And what evidence did Leonardo De V have regarding helicopters and human flight, Len? The story of Daedalus and Icarus?
Now you are being silly, again.
It seems to me that the best approach to LDV's ideas about flying machines would be to see his thinking and drawings as being a general extrapolation from the knowledge of his times: a form of logical guessing. He knew that some things could fly naturally, and for all we know he may well have observed the likes of kite-flying, and being a bit of a polymath he speculated about machines that would be able to support human flight - in that sense if the term 'prophetic' were used it it would mean no more than creative thinking about future innovations: some science fiction could be said to meet the same criteria, such as Jules Verne.
As used by Spud though 'prophecy' implies the very different claim of predictions of future events made in the OT being fulfilled in a specified way by, in this case, the specific person of Jesus. Leaving aside for now the problem that these prophecies and the claims of fulfillment are anecdotal and are indistinguishable from fiction, for LDV's case to be comparable then we would need to see, for instance, LDV prophecise that powered mechanical flight would occur in the first decade of the 20th century in America - but we don't, and one reason we don't is that 'prophecy', beyond logical or lucky guesses, is nonsense.