If you are interested in secret aircraft projects and prototypes, check out
RetroMechanix.com. Recent articles include an overview of the bizarre Douglas Model 1875 Aircraft Nuclear Propulsion Logistic Carrier of 1955:
It features two high resolution blueprints and 3 configurations; the aircraft appears to have utilized components of the C-133. Next up is an article on the turboprop Vought V-358 Attack/Fighter Design Study of 1947:
It features 27 high resolution images of this little known proposal.
This is ideal information for the historian, enthusiast, model scratchbuilder, etc. There are many more articles to come in the weeks ahead, so please visit frequently!
-Jared