The Bristol Siddeley BS.100 is a British twin-spool,
vectored thrust
Thrust vectoring, also known as thrust vector control (TVC), is the ability of an aircraft, rocket, or other vehicle to manipulate the direction of the thrust from its engine(s) or motor(s) to control the attitude or angular velocity of the ve ...
,
turbofan
The turbofan or fanjet is a type of airbreathing jet engine that is widely used in aircraft engine, aircraft propulsion. The word "turbofan" is a portmanteau of "turbine" and "fan": the ''turbo'' portion refers to a gas turbine engine which ac ...
aero engine that first ran in 1960. The engine was designed and built in limited numbers by
Bristol Siddeley Engines Limited. The project was cancelled in early 1965.
Design and development
Based on the 300-series
Olympus, the BS.100 was similar in general arrangement to that of the company's
Pegasus
Pegasus ( grc-gre, Πήγασος, Pḗgasos; la, Pegasus, Pegasos) is one of the best known creatures in Greek mythology. He is a winged divine stallion usually depicted as pure white in color. He was sired by Poseidon, in his role as hor ...
design, but with the addition of
plenum chamber burning
An afterburner (or reheat in British English) is an additional combustion component used on some jet engines, mostly those on military supersonic aircraft. Its purpose is to increase thrust, usually for supersonic flight, takeoff, and co ...
(PCB), to enable the projected
Hawker Siddeley P.1154
The Hawker Siddeley P.1154 was a planned supersonic vertical/short take-off and landing (V/STOL) fighter aircraft designed by Hawker Siddeley Aviation (HSA).
Development originally started under P.1150, which was essentially a larger and fas ...
VSTOL fighter design to accelerate to supersonic speed and to allow the aircraft to hover.
PCB is similar to
reheat
An afterburner (or reheat in British English) is an additional combustion component used on some jet engines, mostly those on military supersonic aircraft. Its purpose is to increase thrust, usually for supersonic flight, takeoff, and combat ...
, but combustion is only applied to the bypass air (i.e. the front nozzles). PCB was quite difficult to develop since combustion had to occur on the bends between fan exit and entry to the two vectoring front nozzles and at much lower inlet pressure and temperature than a conventional afterburner. The PCB flame-holders were highly complex sheet metal fabrications which were difficult to envisage on a 2D engineering drawing. Consequently 3D models in wood had to be produced to aid development of the system.
[Dow 2009, ch. 6]
Variable area front nozzles were required. This was to be achieved by movable ramps mounted horizontally on the fuselage between the front and rear nozzles. For vertical flight and subsonic cruise, the nozzle area would be large, whereas with the PCB lit during acceleration to supersonic speed the ramps would be expanded, reducing flow to the front nozzles and diverting more flow into the core.
Although PCB ran on a Pegasus 2 development engine, it was never fitted to any of the BS.100-8 engines that were built and never flew.
The BS.100 was also intended for the
Fokker Republic D-24
The Fokker/Republic D.24 was a supersonic variable-sweep wing concept aircraft designed from 1962 to 1968 by the Fokker-Republic Alliance, a coalition between Fokker and Republic Aviation. The project was based out of Schiphol, Netherlands, and ...
.
Flightglobal archive Fokker-Republic D-24
/ref>
Variants
A range of BS.100 engines were studied in the early 1960s, but it was the BS.100-8 that was finally selected for development manufacture and was actually built.
Engines on display
A preserved Bristol Siddeley BS.100 is on public display at the Fleet Air Arm Museum
The Fleet Air Arm Museum is devoted to the history of British naval aviation. It has an extensive collection of military and civilian aircraft, aero engines, models of aircraft and Royal Navy ships (especially aircraft carriers), and paintin ...
, RNAS Yeovilton
Royal Naval Air Station Yeovilton, or RNAS Yeovilton, (HMS ''Heron'') is an airfield of the Royal Navy and British Army, sited a few miles north of Yeovil, Somerset. It is one of two active Fleet Air Arm bases (the other being RNAS Culdrose) ...
.
Specifications (BS.100-8)
See also
References
Notes
Bibliography
* Gunston, Bill. ''World Encyclopedia of Aero Engines''. Cambridge, England. Patrick Stephens Limited, 1989.
* Dow, Andrew. ''Pegasus - The heart of the Harrier.'' Barnsley, South Yorkshire. Pen and Sword, 2009.
External links
P.1154 history at harrier.org
{{DEFAULTSORT:Bristol Siddeley Bs100
Low-bypass turbofan engines
BS100
1960s turbofan engines