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Thank you for the information.In response to the previous question, the Northrop XF-15 first flew 03 July 1945.
The Hughes XF-11 first flew two years later on 07 July 1947. That was the flight that nearly killed Howard Hughes.
The XF-15, being based on a production aircraft, was designed and built very quickly. The XF-11 was a much more unconventional design.
I don't know how their capabilities compared, but that would be an interesting question to research a bit.
I started working on the Anigrand 1/72 XF-11 resin model a few years ago. Set it aside because the cockpit needs an awful lot of work. The rest of the kit is pretty straightforward except that the engine cowlings and intakes needed to be completely replaced. I made a new master cowling and have cast resin copies for it.