We received a set of images(1) from Jason Martell to accompany his presentation on ancient technology, including this shot of Pre-columbian "airplane models." Also posted are some photos(2) from Erik Poltorak.

1. http://archive.coasttocoastam.com/gen/page1766.html?theme=light
2. http://archive.coasttocoastam.com/gen/page1767.html?theme=light