Our new Trio Pro autopilot has ‘auto-trim’, so in addition to wiring it up to power, ground, and the servos the pitch servo has an output to the pitch trim actuator There are a couple of different ways for this to interact with the pilot, either you can install a dual pole dual throw switch to select manual or autotrim (which I didn’t want to do, and seemed like a bad idea), or you can install a bridge rectifier and a relay that will normally allow autotrim, but energize the relay and pull the normally open contacts to when you activate manual trim. This is a very slick way to handle it, and so I grabbed a project box and some Radio Shack bits and got to work.
Autotrim defeat circuit |
Autotrim box constructed |
Autotrim box installed |
Posted By: Brett FerrellFriday April 23rd, 2010 at 3:59 PM
Categories: AutoPilot Avionics GRT Hx EFIS Tags: Autopilot Building GRT Trio
[…] talk to the Horizon EFIS, but I think we’ll get that squared away shortly. I even have the AutoTrim cicuit working (Elizabeth likes to call it MagicTrim!). Meanwhile we’re starting the […]