Vertical/short take-off and landing - Bleed air for STOL
Bleed air for STOL
Fig. 18-14 Flap blowing engine.
22. Fig. 18-14 shows one method how STOL can be achieved with a form of 'flap blowing'. The turbo- fan engine has a geared variable pitch fan and an oversized low pressure (L. P.) compressor from the exit of which air is bled and ducted to the flap system in the wing trailing edge. The variable pitch fan enables high L.P. compressor speed and thus high bleed pressure to be maintained over a wide range of thrusts. This gives excellent control at greatly different aircraft flight conditions.