From: "Ron Wormus"
I'm not a aeronautical engineer but I have spent a lot of time flying at high altitudes. 20km ~ 65,000 ft and propellers just don't work up there (pure jets & ram jets not fans are best). Also, even if they did I don't see a "zero ground speed" as being possible at those altitudes (airfoils need dense air or speed).
Oh well, another flash-in-the-pan idea bites the dust !
BTW, Ron, I had written a response to your "machines don't think" post but it was bumped because it was too long, probably. Actually, I had enclosed in that post a whole chapter of an old manuscript I had written some time ago, not thinking about the size limit for posts on vortex, which I think is 40 kb - is that correct?
Maybe I will reword some of the content.
Jones
