This is the earliest design of low-observability aircraft. First, people was seeking to design and produce an operational stealth aircraft. To design the aircraft, the Skunk Works' design team devised a computer program to calculate the radar cross-sections (RCS) of various designs. The eventual design characteristically featured faceted surfaces to deflect radar waves elsewhere. It had highly-swept wings and inward-canted vertical stabilizers, which led to its being nicknamed "Hopeless Diamond". The first operational aircraft made its maiden flight on 1 December 1977. The flight test program validated the feasibility of a flyable stealth aircraft. However, both prototypes were lost due to mechanical problems. Nevertheless, Have Blue was deemed a success, paving the way for the first operational stealth aircraft, Senior Trend, or F-117 Nighthawk. (Selected from Wikipedia)

Max airspeed: 1300mph
Pitch diameter: about 1500ft
Weapon: 2x winggun (20 bullets per second)

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