Trim widget problem in EMS

[b52sfamily]

Hi Guys,
I have installed three RAC servos on my aircraft to operate the Aileron Elevator and Rudder trim. I have the Elevator and Rudder reporting through my VP box (since it only supports two axis) and the Aileron is managed independently by an Infinity Aero board and reports through my EMS unit at C37-P4.

The Elevator and Rudder servo (which is labeled as aileron in the VP box) are operating correctly and I have all the data points set to “1”.

On the Dynon side I have the pin mapped and labeled correctly and there is voltage reporting on the EMS debug data file for that pin.

I have also confirmed that each of the units are sourced correctly. The Rudder and Elevator are sourced from the VP and the Aileron is sourced from the Skyview.

My problem: When I go into the EMS setup and select the only relevant title “TRIM” the widget that shows up (on any scale) has the curved line at the top and a vertical line down the middle. I can program the curved top line as my Rudder servo and the vertical line as my Elevator servo and they work and display just fine. I can not locate any other widget title or option for displaying the Aileron. I even went back and un-named the Aileron pin to see if I could find a widget that was titled C37-P4 but no luck.

Since the Rudder and Elevator are reporting through the VP box it seems that the widget generated is from the VP signal only. I have been through every other widget prompt available in both menus and there is nothing showing up for the Aileron.

I would like to display the three axis in trim but have spent all of today and exhausted quite a few brain cells over this, maybe someone has a suggestion as where to go from here?

Thanks,

b52sfamily
Prowler D #007

 

[b52sfamily]

Re: Trim widget problem follow on

Just to confirm I did everything right I went back to EMS SETUP / SENSOR INPUT MAPPING / C37-P4
I changed the designations to CONTACT / CONTACT / CANOPY and at that point the screen layout editor had a CANOPY designation and I was able to install a widget from it. Deleting all of this I went back and re designated the C37-P4 as POSITION / POSITION / AILRN. Thats where I stumble, an AILRN designation is not available in either the SENSOR or the INFO draw down lists to build a widget from.

So... does all three axis of trim have to come from the same source unit.... VP or EMS sensing?

That may be the issue here.

b52sfamily
Prowler D #007

 

[Dynon]

I think that's the issue here, but I'll need to check with our development team.

 

[Dynon]

So in the setup menu you can choose the source for each of the aileron, elevator, and flaps position. But elevator is not selectable, I think because the VP-X does not have a named channel for that, as you've hinted at with your ".....The Elevator and Rudder servo (which is labeled as aileron in the VP box) are operating...." comment.

Because of this limitation, the only way I think you'll get this to work as you have this connected is to use the VP-X to display your rudder and elevator trim, BUT they'll actually be displayed as aileron and elevator on the widget (curved arc). Then, for your actual aileron trim, you'd hook it up to SkyView to the SV-EMS-220 as a rudder input, and then do the SkyView-based calibration for it. You'll end up having aileron and rudder displayed in the opposite places on the widget in the end. I don't have the immediate ability to test this, but I'll pass this past our dev team to see if this will work (I think it should).

In other words, the source of aileron and elevator trim is selectable on the trim widget, but, the rudder trim isn't.

 

[Dynon]

So in your specific example, you'd need to assign C37-P4 as RUDDER, even though it's really hooked to your ailerons.

 

[Dynon]

Alternatively, to get everything actually displaying in the right way (aileron with the curvy bar; rudder with the straight bar), you'd need to actually hook up the aileron trim output to the VPX, and then the rudder trim output to the EMS, and then they'll be displayed in the normal positions.