The American Super Sonic Transport projects

[McColm]

Been on YouTube and watched a part of a documentary of the Boeing 2707 concepts. The 2707-200 was to have a swing-wing and seat 150-200 passengers with further fuselage stretch. The 2707-300 was a delta wing similar to the Lockheed design carrying 250-300 passengers.
The Lockheed Delta had no canards fitted and was considered a larger version of Concorde with 218 passengers.
JFK insisted that the SST be bigger and fly faster than Concorde at Mach3. North American proposed the NAC-60 which was based on the B-70 bomber. I haven't been able to find the Curtis example.

The question is if the design spec had asked for a maximum cruise speed of Mach 2.5, would any of these aircraft have made it to a flying prototype?

I have the Revell 1/200 Boeing 2707-200 in my stash and intend to build one in airline colours with the other as a bomber/transport.

[Captain Canada]

Too bad they all didn't make it to flying prototype !

[McColm]

From the Boeing proposal you got the F-111 and from North American the B-1A & B-1B.
I know that there were full size mockups built and one is on display in the Hiller Aviation Museum.

[jcf]

There was no 'Curtis' example, Curtiss was dead as an airframe manufacturer by the late '40s.

The F-111 was not developed from the Boeing SST project, they were contemporaries, nor was
the later Rockwell B-1. The different firms all utilized the same basic research, but the projects
were not directly related.

[McColm]

Douglas also explored designs beyond the initial SST specification, looking at Mach 3 possibilities. Douglas model 2229. Like the XB-70 the outer most 20ft of the 100ft wingspan could be folded down for supersonic flight. This feature increased the favorable pressure distribution beneath the wing created by the leading-edge shock wave and supersonic compression alongside the tapered propulsion box of the lower fuselage. Only two wooden in-house models were built, both damaged in the 1994 Californian earthquake.
North American also proposed the M-3000 airliner.

I stand corrected,in Jim Keeshen book 'Secret US Proposals of the Cold War'.
The three airframe manufactures were- Boeing, Lockheed and Both American. The three engine manufacturers were Curtiss Wright, General Electric and Pratt & Whitney.