thrust reversal


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thrust reversal

thrust reversalclick for a larger image
Reverse pitch.
thrust reversalclick for a larger image
Bucket type thrust reverser.
thrust reversalclick for a larger image
Clamshell type thrust reverser.
The method and means of reducing the landing run of an aircraft without excessive use of wheel brakes or any use of braking or tail parachutes. On piston and turboprop engines, it can be done by reversing the propeller pitch. In turbojet engines, it can be done by reversing the direction of the exhaust gas stream. In gas turbine engines, thrust reversal normally is accomplished by mechanical blockage, bucket-type doors (retractable ejector system), clamshell doors, etc.
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In designing the ultrahigh bypass turbofan, critical areas of interest include thrust reversal, interaction of the variable-pitch fan and the core engine, acoustics, fuel consumption reduction, and the mechanical integration compatibility of the variable-pitch mechanism and the fan drive gear system.