Elevator trim

Addition of a simple bracket to which to mount the electric trim servo on the underside of the elevator. Composite blister style fairing will cover the recessed servo. A push rod will emerge through a slot in the fairing and attach to the control horn on the trim tab.

ECU for trim

Per @akschu, using the Rugged MEGA-ET. This is an extended temp range model with better more rugged specs than the Arduino equivalent.

Bristol SG servo integrated position sensor can be read by its I/O pins.

For driving the servo motors with the MEGA, a motor driver sub board is required: https://www.pololu.com/product/2519

Notes for handling input

https://www.arduino.cc/en/pmwiki.php?n=Tutorial/AnalogInput