Oct 302012
 

A 1954 NACA-Langley concept for a hypersonic research airplane, which eventually led to the X-15. Apart from the X-tail and the use of three rocket engines, the configuration is remarkably similar to the X-15 in general terms.

 Posted by at 9:55 pm
  • Michael the Somewhat Civilized

    I think the three engines were proposed in the Republic version, but the X-tail is interesting. I didn’t realize it was seriously considered for manned aircraft.