• Hi Guest! Forum rules have been updated. All users please read here.

Secret Projects Forum

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 before 1945

Secret Postwar Aircraft Projects

Unbuilt and cancelled aviation projects since 1945. Designs that never made to production.

Secret Missile, Bomb and Gun Projects

Unbuilt and cancelled projects of missiles, bombs, guns, and other forms of weaponry

Secret Space Projects

Unbuilt and cancelled rocket and spacecraft projects.

Secret Army Projects

Unbuilt and cancelled tanks, APCs etc. Designs that never made to production.
  • RLBH

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

Blue Envoy Press

Forums relating to books published by Chris Gibson's Blue Envoy Press

General General discussions, not unbuilt projects

Aviation & Space

Aviation and Space discussions on historic programs that made it to production or are still current


Discussion about historic or current tanks, ships, and other non-aerospace military technologies - not unbuilt projects

Site Feedback

Post any feedback on the site here.

The Bar

Post anything offtopic (but likely to be of interest) in here

Research Topics Forums dedicated to specific research topics

Designation Systems

A place to research manufacturers' designation systems

Patent Pending

A forum to post patent images which might correspond to unbuilt projects


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.

Theoretical and Speculative Projects

For theoretical, generic or speculative projects 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

Forum statistics

Latest member

Latest posts

SPF Top Rated