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Interesting topic.

In my 320, all the trim systems utilize springs with the aileron and rudder being MAC servo operated.  The elevator is controlled thru the Reichel geared wheel.  Any of the systems can easily be overidden against the force of the springs if the servo goes to the max.

The Legacy 2000 kit comes with all three trim tabs installed and all are driven by MAC servos.  So:

1) How much force  would be required to overcome the airstream force from the servos being driven to their max extension or retraction?  2) Should the servos be slowed down with the option available from MAC?

3) At approach and landing airspeeds, is the max out-of-trim condition more manageable?

4) Can and should the max trim displacements be physically limited (stops) to the max trim needed for the flight envelope?  I especially liked the "dead-man" switch approach so that a stick mounted finger switch must first be depressed before electricty is applied to any trim circuit.  This would limit the extent of the runaway since you would feel it starting during application of trim and could simply stop it by lifting a finger (You know which finger to raise?).

Scott Krueger
N92EX
Legacy #2

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