If you are interested in vintage project and prototype aircraft, please visit
http://retromechanix.com/, which currently features a comprehensive set of articles devoted to the US Navy OS-130 Day Fighter competition of 1953, which ultimately yielded the F8U Crusader and F5D Skylancer. These articles are accompanied by approximately 500 high resolution images available to freely view and download of the Convair Carrier Based F2Y, Douglas Model 652, Grumman Design 97, Lockheed L-242 Navalized Starfighter, McDonnell Model 90/91, North American OS-130 Class VF Day Fighter, Northrop Model N-94, TEMCO Model 31, Vought V-383/V-384, and Vought XF8U-1 Mock-up Inspection. All of it is based on primary documents and the majority is previously unpublished.

Other articles include a summary of the "Sapphire powered Grumman Cougar" proposal of 1952:

The Douglas Model 1209 High Speed Composite Bomber of 1950:

Some unconventional North American Aviation ESO 4705 CIC / AEW Studies of the early Cold War period:

And the navalized North American F-100 Super Fury proposal of 1953:
Going forward, we will be regularly updating the site several times per week with new articles on various aerospace studies, prototypes, modifications, etc. Please check back frequently, add us to your RSS feed, etc.
Thank you for your consideration; I hope you enjoy the site and visit frequently.
Best Regards,
Jared Zichek
Editor, RetroMechanix.com