OK, I was all but sold on the idea of using electric trim since I'll be putting in an autopilot allowing for autotrim. Then I read that some people have encountered runaway that can (potentially) overwhelm manual control.
When I review detail of the failure mode for the RAC servos they appear to lock in place on power loss. I would have expected them to disengage. So effectively you cut power to runaway trim and you are stuck fighting it to the ground.
When I look at the 9a preview plans I see the servo/cable placement makes it such that it appears to be one or the other. Does anyone make a servo that allows manual control pass-through so that when you disengage the electric trim the servo releases and allows a cable to takeover. Of course the vernier control must be modified to be unlocked during electric control but this would take away runaway angst and servo locking into position.
Sorry for the mouthful, and hope it makes sense. In GA I believe the AP servo still gives access to the trim wheel. Maybe someone else has already addressed this but I don't see it anywhere.
Thanks.
MIchael B.
When I review detail of the failure mode for the RAC servos they appear to lock in place on power loss. I would have expected them to disengage. So effectively you cut power to runaway trim and you are stuck fighting it to the ground.
When I look at the 9a preview plans I see the servo/cable placement makes it such that it appears to be one or the other. Does anyone make a servo that allows manual control pass-through so that when you disengage the electric trim the servo releases and allows a cable to takeover. Of course the vernier control must be modified to be unlocked during electric control but this would take away runaway angst and servo locking into position.
Sorry for the mouthful, and hope it makes sense. In GA I believe the AP servo still gives access to the trim wheel. Maybe someone else has already addressed this but I don't see it anywhere.
Thanks.
MIchael B.