Cubdriver
>
> Bill Shatzer
>
> >I had thought both the B-25 and the B-26 arose from the same 1939 USAAF
> >specification and request for proposals and thus the two designs were
> >roughly contemporaneous.
>
> Yes, the U.S. Army often twinned its RFPs, realizing that aircraft
> design in the 1930s/1940s was an imprecise art, and that one of the
> planes might not pan out. Thus the B-25/26, B-35/36 etc.
Also the B-29 and the B-32.