Identified Flying Objects
I found this that has some things of interest in ref to Crafts related to some known type UFO sightings .. or topics associated with UFOs.
(http://www.laesieworks.com/ifo/images-ifo-index/ifo-library.jpg)
IFOs (Identified Flying Objects) have nothing to do with UFOs (Unidentified Flying Objects). My definition of an IFO: A disc shaped aerospace VTOL craft made by humans. It should have these flight characteristics: Vertical Take-Off and Landing (VTOL), hovering, and flight in any direction.
Most IFOs build so far have poor flight characteristics, but note that most were build a long time ago, before the computer age and modern materials.
Chemical rocket engines, that repel on onboard-mas, will never bring us far into space. To fly more efficient than traditional aircraft and rockets, new propulsion techniques need to be invented first, and therefore a better understanding of elementary things like: energy, space, mass, gravity, and maybe even; psychology.
What IFOs have been build? How to make an IFO? How could we design the future of space travel? Surf this site!
http://www.laesieworks.com/ifo/index.html