X-3 Stiletto Korean War but in June 1948 the

but in June 1948 the second YB-49 was destroyed with the loss of its five man crew in a crash attributed to structural failure

The YB-49 was born when Northrop modified two YB-35's to jet power

The installed model was the R-2800-18W

Messerschmitt Me-110 airplane model

It is also capable of being loaded onto an Air Force C-130

X-3 Stiletto Korean War but in June 1948 theX 3 Stiletto NASA airplane model. The X 3 twin turbojet, the sole model constructed, was developed to evaluate the capabilities necessary for sustained supersonic flight at high altitudes. Additionally, it served to assess the application of novel materials like titanium and innovative construction methods. On October 20, 1952, the X 3 took off for its maiden flight at Edwards AFB, California, and achieved supersonic flight in June 1953. In contrast