Ford Mustang Mach 1 Prototype, 1966. A design study for some of the styling updates that were made on the 1969 MY Mustang. The prototype (photographed on November 18, 1966) featured rectangular lights, a lowered roofline, concealed door handles and a hatchback, as well as racing-style fuel filler caps, that enter made it into production
#prototype
Stargate SG-1 9.09 “Prototype”
Martin XB-51, circa 1950s. The XB-51 was a trijet ground-attack aircraft and was originally designated XA-45. The "A" ground-attack classification was eliminated in the late 1940s, and was given the XB-51 designation.
In 1950, the United States Air Force issued a new requirement based on early Korean war experience for a night intruder/bomber to replace the Douglas A-26 Invader. The XB-51 was entered, as well as the Avro Canada CF-100 and English Electric Canberra; the XB-51 and Canberra emerged from these as the favorites.
Martin XB-51
If you're still roasting, Roast the IAI Lavi?
The cute child of the F-16 and Mirage v, a highly interesting lightweight multirole fighter jet that could have become the first single-engine BVR-capable fighter jet had the Israelis not been pressured by america to abandon the project, not to mention it had the potential of becoming the best single-engine multirole fighter of the 4th generation, as her design came to be from all the Israeli experience fighting with their arab neighbors, but ala, geopolitics killed her…
At least the design lives on as the Chinese J-10.
XB-36 with tracked landing gear, which was tested while trying to find a landing gear system that would work well for such a large aircraft
LM Ericsson // Videophone Prototype (Sweden, 1981)
A short-lived monorail prototype on the go in Houston Texas by Joe Sherschel for LIFE magazine 1956

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