I am just resurrecting this tired old thread in order to point out that, thanks to Tony Buttler, I now know who REALLY invented the F-15/MiG 25 layout
(whether either of them copied it however is something we will probably never know).
The true origin of the 'twin engines side by side in a box fuselage with a shoulder wing and twin fins' layout was the North American WS-300.
This was a fighter bomber design proposed in 1955 as a rival to the F-105 Thunderchief and also included an internal weapons bay, unlike either of the
similar looking designs we were debating. This was three years before work on the MiG 25 started and THIRTEEN years earlier than the F-15 design. When
you consider that its contemporaries around the world (ie still largelyon the drawing board in 1955) were the F-4 Phantom and BAC Lightning (both
flown 1958) and in service fighters were the F-100, Hunter and MiG 17 then it is remarkable how futuristic this design looked. Round of applause for
North American Aviation then