Hawker Siddeley P.1127

Hawker Siddeley P.1127
País	Uk
Tipo	Aeronave experimental V/STOL
Primer vuelo	19 de noviembre de 1960 (P.1127) – 7 de marzo de 1964 (Cernícalo)
Construido	6 P.1127s – 9 Cernícalos

el Hawker P.1127 y el Hawker Siddeley Cernícalo FGA.1 son los aviones experimentales y de desarrollo que condujeron al Hawker Siddeley Harrier, el primer cazabombardero a reacción vertical y/o corto de despegue y aterrizaje (V/STOL). El desarrollo del P.1127 comenzó en 1957, aprovechando la elección de Bristol Engine Company para invertir en la creación del motor de empuje vectorial Pegasus. Las pruebas comenzaron en julio de 1960 y a finales de año el avión había logrado tanto el despegue vertical como el vuelo horizontal.

Fuente: Hawker Siddeley P.1127 en Wiki

Hawker XV-6A Cernícalo Paseo alrededor
Fotógrafo	Vladimir Yakubov
Localización	Centro Aéreo y Espacial de Virginia, Hampton, VA
Fotos	106

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Hawker Siddeley P.1127 Harrier Walk Around
Fotógrafo	Burhand Donke
Localización	Unknow
Fotos	21

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Hawker P.1127 Walk Around
Fotógrafo	Meindert de Vreeze
Localización	Unknow
Fotos	41

Development and the Tripartite Evaluation

The Hawker Siddeley Kestrel was an experimental V/STOL (Vertical/Short Take-Off and Landing) aircraft developed in the early 1960s as a follow-up to the P.1127. It served as a critical technology demonstrator for the “vectored thrust” concept. In 1964, a unique “Tripartite Evaluation Squadron” was formed, consisting of pilots and ground crews from the UK, the United States, and West Germany. This joint team spent a year proving that a jet fighter could operate from unprepared fields, forest clearings, and small ship decks, effectively laying the operational groundwork for the future Harrier.

Attribute	Standard Specification (Kestrel FGA.1 / XV-6A)
Papel	V/STOL Evaluation Aircraft
Equipo	1 (Pilot)
Planta motriz	1 x Bristol Siddeley Pegasus 5 (15,200 lbf thrust)
Velocidad máxima	1,142 km/h (710 mph) / Mach 0.92 at sea level
Longitud	12.95 meters (42 ft 6 in)
Envergadura	6.99 meters (22 ft 11 in)
Maximum Weight	7,030 kg (15,500 lb)
First Flight	March 7, 1964

The Pegasus Engine and Vectored Thrust

Single-Engine Solution: Unlike other VTOL designs that used multiple “lift engines,” the Kestrel used one Pegasus turbofan with four rotating nozzles to direct all thrust for both hover and forward flight.
Reaction Control System: Because aerodynamic surfaces (flaps/rudders) don’t work in a hover, the Kestrel used “puffer” jets at the nose, tail, and wingtips, fed by engine bleed air, to maintain balance.
Landing Gear: It featured a unique “zero-track” bicycle landing gear—two main wheels in tandem under the fuselage and small outrigger wheels on the wingtips for stability.
VIFF Capability: During testing, pilots discovered they could “Vector In Forward Flight” (VIFF), rotating the nozzles during air combat to decelerate rapidly or turn tighter than conventional aircraft.

Transition to the United States

The XV-6A Designation: After the tripartite trials ended in 1965, six of the aircraft were shipped to the US for further testing by the Army, Navy, and Air Force, receiving the American designation XV-6A.
Marine Corps Interest: While the US Air Force and Army eventually passed on the design, the US Marine Corps was so impressed by the XV-6A trials that they pushed for the acquisition of its successor, the AV-8A Harrier.
Preservation: Several Kestrels survive today, most notably at the National Museum of the US Air Force in Dayton, Ohio, and the Pima Air & Space Museum in Arizona.

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