In a jet‐propulsion plant for aircraft, the propulsive eflort is reduced for landing by extracting air from the augmenter stream before it mixes with the turbine exhaust and discharging it through forwardly‐directed orifices. The extraction of the air into the nacelle is governed by valves m and the openings for forward‐discharge from the nacelle are always open These openings may be anywhere in the nacelle shell and may be in the lip o of the main air intake. The augmenter valve n is closed when the extraction valve m is open.
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