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Old 10-28-2021, 12:16 AM
bruceh's Avatar
bruceh bruceh is offline
Join Date: Mar 2008
Location: Ramona, CA
Posts: 2,536

You can use the VP-X for trim switches and trim motor power, or move those over to the Skyview AP control head. I have been flying my RV-9A with the VP-X trim controls and it works just fine. If the Skyview wants more pitch up or down, it will annunciate ("TRIM UP" or "TRIM DOWN") and you just need to bump the hat switch to adjust the trim to quiet the voice.

With the Skyview AP head, it is my understanding that if the AP servos detect too much pressure and if wired to the trim system, it will make the trim adjustments automatically. I don't have the AP control head, so I don't know if it will annunciate what is is doing or not. (I'm assuming it does any auto trimming silently).

I'm getting ready to add the AP control unit for the Skyview, and I did notice that on the VP-X, both the pilot and co-pilot trim switches are connected together, so there is no distinguishing in the electronics as to which stick is manipulating the trim switches. On the Skyview AP control unit, the pilot/co-pilot inputs are separate and the pilot's inputs override the co-pilot's.
This is going to involve a fair bit of rewiring and running 4 new wires from the co-pilot stick up to the AP control unit. I'm wondering if this "feature" is really needed or not. 99% of the time when I'm flying, the co-pilot stick is stowed and isn't even connected. If I leave the stick wiring alone, then I'm basically staying with what I currently have with the VP-X, and either trim control for pilot/copilot will move the trim and there is no override by the pilot.

Any downsides to leaving the copilot trim control wires disconnected on the Skyview AP control head? Instead the copilot trim switches will still all be tied to the pilot inputs.
Bruce Hill
RV-9A N5771H flown over 900 hours!
APRS Tracking for KJ6YRP and Flying Over the Hills Blog
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