Hawker Siddeley HS. 1205 History

The Pegasus turbofan engine was a development of the British Rolls-Royce company, the system first run in September of 1959 and progressively updated in subsequent years. Developed from the earlier Bristol Siddeley "Orpheus" turbofan, over 1,000 of the type have been manufactured and these formed the powerplant-of-choice for such types as the Hawker Siddeley "Harrier" Short / Vertical Take-Off and Landing (S/VTOL) attack jet, its naval counterpart the BAe "Sea Harrier", and the "Americanized Harrier" - the McDonnell Douglas AV-8B "Harrier II" (the engine being designation stateside as the "F402"). The key design quality of this engine was in its ability to direct thrust, not only aft, but also downward by way of swiveling nozzles used in providing the vertical lift needed.

The prospect of a vertically-lifting, horizontally-flying combat airplane was a tempting one particularly during the height of the Cold War period (1947-1991) where scenarios saw massive formations of Soviet armor crossing into Western Europe with little notice with air support overhead. Forward-operating bases would be established by Western powers to reach the enemy in time and, key to a quick response, there would be fleets of vertically-lifting warplanes armed with missiles, guns, and bombs. The solution of the British Harrier certainly fit this concept well and the design became a success for its part in military aviation history.

In this same vein, Hawker Siddeley drew up plans for a lightweight, supersonic-capable, single-seat / single-engine, missile-armed fighter under the project designation of "HS. 1205". The aircraft was intended to operate using a minimal take-off run and was therefore outfitted with the same Pegasus engine that incorporated lift jets to get the fighter into the air in short order. Though not a true V/STOL aircraft as in the Harrier "Jump Jet" of the late-1960s, the lift jets in HS. 1205 with its Short Take-Off and Vertical Landing (STOVL) capability would have produced a quick-reaction fighter nonetheless - and even one that could operate from a destroyed / damaged airfield or from one of a considerably small footprint.

Hawker Siddeley engineers undertook the project, itself an evolution of earlier work by the company, in 1976 and this initiative continued on for a few years before the idea was eventually abandoned due to technical challenges. The resulting aircraft had a very modern look to it complete with smooth, sleek lines with an appearance akin to the contemporary American General Dynamics F-16 "Fighting Falcon" with some elements seen in the Harrier itself.

Hawker Siddeley HS. 1205 Specification

BASICS

Service Year

1976

Origin

United Kingdom

Status

CANCELLED

Development Ended.

Crew

1

Production

0

MANUFACTURER(S)

Hawker Siddeley - UK

OPERATORS

United Kingdom (abandoned)

ROLES

Air-to-Air Combat, Fighter

General ability to actively engage other aircraft of similar form and function, typically through guns, missiles, and/or aerial rockets.

Interception

Ability to intercept inbound aerial threats by way of high-performance, typically speed and rate-of-climb.

X-Plane (Developmental, Prototype, Technology Demonstrator)

Aircraft developed for the role of prototyping, technology demonstration, or research / data collection.

DIMENSIONS & WEIGHTS

Length

54. 0 ft

(16. 45 m)

Width/Span

36. 9 ft

(11. 25 m)

MTOW

30,865 lb

(14,000 kg)

POWER & PERFORMANCE

Installed:

1 x Rolls-Royce "Pegasus" 11D-43 afterburning engine developing 22,050lb of thrust dry and 30,850lb of thrust with reheat.

Max Speed

1,314 mph

(2,115 kph | 1,142 kts)

Ceiling

36,089 ft

(11,000 m | 7 mi)

MACH Regime (Sonic)

Sub

Trans

Super

Hyper

HiHyper

ReEntry

RANGES (MPH) Subsonic: <614mph | Transonic: 614-921 | Supersonic: 921-3836 | Hypersonic: 3836-7673 | Hi-Hypersonic: 7673-19180 | Reentry: >19030

ARMAMENT

STANDARD (fixed, forward-firing):2 x 27mm internal automatic cannons in underwing gun pods (one gun to each wing mainplane member). OPTIONAL:2 x AIM-9 "Sidewinder" Short-Range Air-to-Air Missiles (SRAAMs) on wingtip mounts. 2 x AIM-9 "Sidewinder" SRAAMs OR conventional drop bombs held underwing.

Supported Types

(Not all ordnance types may be represented in the showcase above)

HARDPOINTS

Hardpoint Mountings: 4

VARIANTS

HS. 1205 - Base Project Designation. HS. 1205-5 - Proposed variant.

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