Hawker  Aircraft

The British Aerospace 125 is a twinjet mid-size business jet. Originally developed by de Havilland and initially designated as the DH125 Jet Dragon.

 

Hawker HS.125 Dominie

Development

The DH.125 is a low-winged monoplane, powered by two engines mounted on the rear fuselage. It features a slightly swept wing, being based upon the larger de Havilland Comet's wing planform, and employs large slotted flaps and airbrakes to better enable operations from small airfields; the aircraft can be flown from hardened grass airstrips The type has a perfectly cylindrical fuselage with the one-piece wing mounted upon the underside of the fuselage; this design allows for the majority of manufacturing and assembly work of the wing and fuselage to be performed as separate sections with the two being joined together late in the production process. The wing also houses integral fuel tanks which contain the majority of the aircraft's fuel.

 

Early models of the aircraft were powered by several versions of the Bristol Siddeley Viper turbojet engine, while later aircraft have adopted more recent turbofan powerplants such as the Garrett TFE731 and Pratt & Whitney Canada PW300. As well as providing the propelling thrust of the aircraft, each engine's accessory gearbox drives electric generators for electrical power and fuel, oil, and hydraulic pumps. The design is redundant so that in the event of a single engine failing, all aircraft systems continue to operate normally.

 

All control surfaces of the aircraft are aerodynamically balanced via set-back hinges and geared tabs. The flaps and airbrakes are operated using the aircraft's hydraulics, while the ailerons, elevators, and rudder are manually-actuated. The design of the control circuits allows for an Collins-built A.P.103 autopilot to be incorporated. Each aircraft is typically equipped with a de-icing system, which uses a mixture of bleed air from the engines, TKS fluid for general airframe, and AC electric windshield heating to prevent ice formation. From the type's introduction to service, weather radar was incorporated into the aircraft's avionics.[8] Some operators, such as the Royal Air Force, had equipped their 125s with electronic countermeasures to defend against hostile missile attacks upon the aircraft

 

 

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Hawker HS.125 Dominie

The British Aerospace 125 is a twinjet mid-size business jet. Originally developed by de Havilland and initially designated as the DH125 Jet Dragon, it entered production as the Hawker Siddeley HS.125, which was the designation used until 1977. Later on, more recent variants of the type were marketed as the Hawker 800.

  • History

    Role Mid-size business jet

    Manufacturer de Havilland (design)

    Hawker Siddeley (to 1977)

    British Aerospace (1977–1993)

    Raytheon (1993–2007)

    Hawker Beechcraft (2007–2013)

  • Primary Users

    First flight 13 August 1962

    Status Active service

    Primary users Japan Air Self-Defense Force

    Brazilian Air Force

    Produced 1963–2013

  • General Info

    Number built 1,720

    Unit cost

    £150,000 (1962)

    -600: US$1.45M (1972)

    $12,995,000 (1995)

    Variants Hawker 800

You are definitely intrigued to discover Hawker HS.125.

In 1961, de Havilland began work upon a small business jet, then known as the DH.125 Jet Dragon, which was intended to replace the piston engined de Havilland Dove, a successful business aircraft and light transport. Prior to the start of the project, de Havilland had determined that a successful business jet would require several variables to be met, including a range of at least 1,000 miles, the speed and cost factors of a suitable jet engine to outperform turboprop-propelled competitors, and an engineering philosophy that favored reliability and conventionality. The design team settled on a twin-engine aircraft with the engines mounted on the rear fuselage.

Hawker 125 Dominie

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The British Aerospace 125 is a twinjet mid-size business jet. Originally developed by de Havilland and initially designated as the DH125 Jet Dragon.

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