Planning New Installation

[KevinD]

Currently planning my panel and electrical system and am seeking some real world, been there done that......

Aircraft Bearhawk, 4 place, Steel tube, fabric fuselage, aluminum wings.
Skyview System Configuration:
2  10 in Displays Bu Batt, 2 ADAHRS, Xpndr, EMS, ADSB, AP,
SL 30, Dual Light Speed Ignition.

Have been reading the manual and understand system and equipment placement and requirements.

That said, and the fact that everything in an aircraft is a series of compromises.......

With respect to magnetic and EMI interferences for the magnetic heading function of the ADHARS.

How big a factor is EMI, to the system as a whole and
do others see Com Radio and Electronic Ignition noise creeping into the system?

I could install the ADHARS remote from the panel area but that creates several other issues and proximity to Antenna
and AP servos.....

And do the power supplies of the displays bleed into an audio panel adjacent to the displays?

I know correct grounding / shielding is essential.

Any comments would be appreciated.

Kevin

 

[dynonsupport]

Because of magnetic interference, the ADAHRS near the servos won't work (you'll want to be 2ish feet away, ideally).

SkyView is generally really good at not adding noise to your radio stack, and you can search the forum and find reports of issues in this area that have since been solved for most people through the use of either filters (solution for early units) or a slight hardware redesign (which makes those same improvements internally).

We'll let other customers speak for themselves, though.

 

[mmarien]

I believe the proper mounting the ADAHRS will be the best thing that you can do to make the system work well. I don't think there is a limit on the length of the network cable so remote is not a restriction. I hung the ADAHRS from the top of the fuselage in my Glasair behind the rear bulkhead using an adjustable aluminum bracket and brass bolts. I took the idea from another I saw on this forum although I believe he used a composite mount. Mine is well removed from wiring, servos and antennas. It seems to be very accurate and stable.

I have the P-Mags and use an electronic fuel injection with an ECU plus VP-X, none of which seems to cause any grief with my system. The ECU and VP-X are both mounted behind the panel but on the opposite side of the cabin from the single Skyview. I had to use the filters to solve the radio interference (early unit).

You might want to test the location of your ADAHRS before you finalize the design. Using a compass to find a magnetically benign place is a good start.

 

[KevinD]

Thanks for the compass tip. I have found a couple of benign
places among the maze of fuselage tubing.

Now, How does the distance aft of the CG affect the
ADHARS / system sensitivity? All other things being equal
is it better to be near the CG or further Aft?

My aft of CG is about 7 feet.
It would seem that angular rate of change velocities
would be quite different.

Thanks
Kevin

 

[mmarien]

Dynon has the a diagram on page 2-6 of the Installation manual. Seven feet is within their limits.

 

[dynonsupport]

Thanks for the compass tip. I have found a couple of benign
places among the maze of fuselage tubing.

Now, How does the distance aft of the CG affect the
ADHARS / system sensitivity? All other things being equal
is it better to be near the CG or further Aft?

My aft of CG is about 7 feet.
It would seem that angular rate of change velocities
would be quite different.

Thanks
Kevin

As mmarien pointed out, the diagram of the acceptable installation limits of the ADAHRS is on page 2-6 of the current SkyView System Installation Guide. If the ADAHRS is installed per that guideline, there is no difference in performance mounted anywhere within those limits.