Overview
Lockheed Have Blue was a pair of technology demonstrator aircraft built by the Skunk Works in 1977–1979 to validate the concept of a survivable aircraft whose primary defence was radar cross-section reduction rather than speed or electronic countermeasures. Have Blue was the direct ancestor of the F-117 Nighthawk and the first aircraft to fly with a shape designed entirely by computer to minimise radar return.
The programme was conducted under extraordinary secrecy. The two prototypes were designed, built, and tested in less than two years — a pace made possible by the Skunk Works' streamlined management model under Ben Rich. Both prototypes were lost in accidents during testing, but the flight data they generated validated every key element of the stealth concept and justified the immediate launch of the Senior Trend production programme.
Design and Low-Observable Technology
Have Blue's faceted shape was generated by a computer program called Echo, developed by Lockheed radar specialist Bill Schroeder. Echo could predict the radar cross-section of an object composed of flat panels but could not model curved surfaces — hence the angular, diamond-like appearance of both Have Blue and the subsequent F-117.
The aircraft was approximately 47 feet long with a wingspan of about 25 feet — roughly 60% the size of the later F-117. It was powered by two General Electric CJ610 turbofan engines (non-afterburning commercial derivatives of the J85). The engine intakes were fitted with grilles coated with radar-absorbent material to shield the compressor faces from radar returns. The exhaust was routed through narrow rectangular nozzles flattened into the upper wing surface.
The entire aircraft was coated with an early generation of radar-absorbent material (RAM). The wings were swept forward at a sharp angle — an inverted-V configuration that contributed to the aircraft's unusual appearance. The aircraft had no vertical tail surfaces; directional control was provided by split trailing-edge surfaces.
Development History
The Have Blue programme originated in 1974 when DARPA initiated a study called HAVE BLUE (sometimes rendered as a single word) to explore the feasibility of a low-observable combat aircraft. DARPA invited Lockheed, Northrop, and other contractors to submit design concepts.
Lockheed's Skunk Works had a unique advantage: the division had been performing radar cross-section analysis for the CIA's A-12 Oxcart programme since the late 1950s and had developed the Echo computer program for predicting radar returns. The Skunk Works team, led by Ben Rich (who had succeeded Kelly Johnson as Skunk Works director), proposed a faceted-body design that Echo analysis predicted would have a radar cross-section several orders of magnitude smaller than a conventional aircraft of the same size.
In April 1976, DARPA and the US Air Force awarded Lockheed a contract to build two subscale technology demonstrator aircraft under the code name Have Blue. The contract was valued at approximately $30 million — a remarkably small sum for a programme that would transform military aviation.
Flight Testing
The first Have Blue prototype (HB-1) was assembled at Lockheed's Burbank facility and transported by C-5 Galaxy to the classified Groom Lake test site (Area 51) in Nevada. It first flew on 1 December 1977, with Lockheed test pilot Bill Park at the controls.
HB-1 completed its first flight successfully, but the aircraft was difficult to fly. The faceted shape that made it stealthy also created poor aerodynamic characteristics: high drag, marginal stability, and unpleasant stall behaviour. The fly-by-wire flight-control system was essential to keeping the aircraft controllable.
On 4 May 1978, HB-1 was lost in an accident. Test pilot Bill Park experienced a gear-up landing after a hydraulic failure, and the aircraft was damaged beyond repair on landing. Park was injured but survived.
The second prototype (HB-2) continued the test programme. It first flew in July 1978 and accumulated approximately 50 flights. On 11 July 1979, HB-2 was lost when the pilot, Lieutenant Colonel Norman Kenneth Dyson, experienced an engine fire and was forced to eject. The aircraft was destroyed.
Despite the loss of both prototypes, the Have Blue programme was an unqualified success. The flight data confirmed that the Echo-predicted radar cross-section was achievable in practice, and the aircraft's handling characteristics, while challenging, were manageable with fly-by-wire controls. The Air Force immediately proceeded with the Senior Trend programme to build an operational stealth attack aircraft — the F-117.
Legacy: From Have Blue to the F-117
Have Blue's legacy is incalculable. It proved that an aircraft designed around radar cross-section reduction could fly, could be controlled, and could achieve a militarily significant reduction in detectability. The F-117 Nighthawk, which entered operational service in 1983, was a direct scaled-up derivative of the Have Blue configuration.
More broadly, Have Blue established the paradigm that has governed stealth aircraft design ever since: the aircraft's shape is the primary determinant of its radar cross-section, and the shape must be optimised computationally before any metal is cut. Every subsequent stealth aircraft — the B-2, F-22, F-35, B-21, and international designs — descends from the methodological breakthrough that Have Blue validated.
The programme also reinforced the Skunk Works management model: small teams, direct customer access, rapid iteration, and acceptance of risk. The entire Have Blue programme, from contract award to loss of the second prototype, lasted just over three years — a pace inconceivable in modern acquisition.
Specifications
| Parameter | Value | |---|---| | Role | Stealth technology demonstrator | | Manufacturer | Lockheed (Skunk Works) | | First flight | 1 December 1977 | | Number built | 2 | | Crew | 1 | | Length | ~47 ft (14.3 m) | | Wingspan | ~25 ft (7.6 m) | | Engines | 2 × General Electric CJ610 non-afterburning turbofans | | Max speed | ~Mach 0.8 (estimated) | | Status | Both prototypes lost in accidents | | Programme cost | ~$30 million |
Declassification and Provenance
The Have Blue programme was declassified in the early 1990s, after the F-117's existence had been acknowledged. Photographs of the Have Blue prototypes were released at that time. The two prototypes were destroyed in their respective accidents, and no examples survive in museums.
The gallery image associated with this technology is from a legacy image compilation whose CIA-P2 catalog number is a legacy identifier and does not establish CIA authorship, declassification, or provenance for this specific photograph. The image appears to show a Have Blue prototype in a ground or display setting, but the precise date and location cannot be verified from the image alone.
References
- Rich, Ben R. and Janos, Leo. Skunk Works. Little, Brown and Company, 1994.
- Crickmore, Paul. F-117 Nighthawk. Osprey Publishing.
- Goodall, James. America's Stealth Fighters and Bombers. Motorbooks International.
- Sweetman, Bill. Stealth Aircraft. Motorbooks International.
- Pace, Steve. F-117 Stealth Fighter. Airlife Publishing.