Forum Rules - Please Read
All users should be familiar with the rules of the forum.
Secret (Unbuilt) Projects Forums to discuss designs that never made it to production.
Secret Early Aircraft Projects
Unbuilt and cancelled aviation projects prior to. Designs that never made it into production.
Secret Postwar Aircraft Projects
Unbuilt and cancelled aviation projects since 1945. Designs that never made it into production.
Secret Missile, Bomb and Gun Projects
Unbuilt and cancelled projects of missiles, bombs, guns, and other weapons. Designs that never made to production.
Secret Space Projects
Unbuilt and cancelled rocket and spacecraft projects. Not for current or historic produced designs.
Secret Naval Projects
Unbuilt and cancelled ships, subs etc. Designs that never made to production.
Secret Army Projects
Unbuilt and cancelled tanks, APCs etc. Designs that never made to production.
Secret Project-related books and products Books and other things you might like
SPF Top Rated
A place to discover quality books and other Secret Projects related products. Moderated forum.
Books & Marketplace
Book reviews, prerelease information, & related products
General General discussions, not unbuilt projects
Aviation & Space
Aviation and Space discussions on historic programs that made it to production or are still current
Military
Discussion about historic or current tanks, ships, and other non-aerospace military technologies - not unbuilt projects
Research Topics Forums dedicated to specific research topics
Aircraft Design
A forum to share Aircraft Design resources and discuss aircraft design techniques
Designation Systems
A place to research and document designation systems used by manufacturers, air forces and other organisations
Patent Pending
A forum to post patent images which might correspond to unbuilt projects
Propulsion
Built, unbuilt and prototype engines of all types
Avionics and Military/Naval electronics
Aircraft avionics, radars, sensors and optical sights of all kinds used on aircraft, boats, tanks, etc.
Discussion and Speculation Forums relating to off-topic discussion, alternate history and what-if scenarios
Theoretical, Fake and Generic Projects
For theoretical, generic, speculative or faked projects published in journals, magazine and books which are nevertheless likely to be of interest to forum members.
Alternative History and Future Speculation
Discussions on how alterations in history might alter the outcomes for built and unbuilt projects
User Artwork and Models
Unofficial drawings, images and scale models of real projects created by users
Site Feedback
Post any feedback on the site here.
The Bar
Post anything offtopic (but likely to be of interest) in here
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1/72 scale 3D printed prototypes and proposed projects- Latest: lostcosmonauts
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SPF Top Rated
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X-Planes from the X-1 to the X-60: An Illustrated History (Springer Praxis Books)- Started by archipeppe
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helmutkohlACCESS: Top Secret