Bristol Siddeley BS100

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The Bristol Siddeley BS100 was a two-spool, vectored thrust, turbofan, similar in general arrangement to that of the Pegasus, but with the addition of Plenum Chamber Burning (PCB), to enable the P1154 VSTOL fighter to accelerate to supersonic speed.

PCB is akin to reheat, but is only applied to the bypass stream, as the flow turns from fan exit to the nozzle bearing plane. Variable area front nozzles are required, to maintain consistent fan matching regardless of whether the PCB is alight or not.

[edit] Specifications (BS100)

General characteristics

Type: Turbofan
Length:
Diameter:
Dry weight:

Components

Compressor: Two-spool
Bypass ratio: 0.9:1

Performance

Thrust:
- 26,200 lbf (116.5 kN) PCB off
- 35,900 lbf (160.0 kN) short lift thrust, PCB on
Overall pressure ratio: 11.45:1
Specific fuel consumption:
- 0.615 lb/(hr·lbf) (62.73 kg/(kN·h)) at 19,200 lbf (85.4 kN) dry thrust
- 1.16 lb/(hr·lbf) (118.3 kg/(kN·h)) with PCB
Thrust-to-weight ratio: :1