RETRACTION SYSTEM

The engine is mounted on a simple, single tubular pylon driven by an electro-mechanical linear actuator.

The sliding throttle has detents for engine deployment and retraction, and the throttle position signals the actuator to operate via the ECU.

The actuator has built-in micro switches to limit the fully extended and retracted position, and in addition there are physical stops fitted to the engine box.


The kinematics system is designed according to CS-22 load requirements.

 


The static loading capacity (locking) of the actuator can withstand all forces in the flight envelope. Precision bolts are used throughout in the system minimizing play and the actuator in combination with the physical stops provides positive locking of the engine in both extended and retracted positions.

Sliders operating in profiled cut-out arms connected to the pylon open and close the main doors in sequence as the engine deploys and stows again. A sprung loaded arm operates the small ‘finger door’. The main doors can be opened without electrical power (or in the event of a mechanical or electrical system failure) for access and maintenance.

Extension time is ~10 seconds. The time from pilot selection of extension to full thrust will be determined during flight testing.

 
 

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