Garmin Panel Decisions Help

[David Carter]

Originally Posted by mfleming

• G5 EFIS - That's a new addition to the panel. The reason for adding the G5 is I wanted a second AHRS but it wasn't THAT much more to to just use the G5 as the redundant AHRS unit instead of bolting one on the back of the second G3X.

One of the things I learned when I went to the AEA's Avionics Installation for Experimental Aircraft course was that you do not want to bolt the ADAHRS to the back of the GDU. Yes, there are mounting hole there to do this. However, there are a couple of problems with doing it. One is vibration. The panel & G3X aren't stiff enough to prevent this, and the vibration interferes with calibration. There are also servicability issues. Removing a GDU gives you great access to everything else behind the panel. Putting the GSU 25 on the back of the GDU makes that more difficult due to the pitot static tubing.

[Walt]

One big advantage to dual GSU25's is the G3X compares their data and will throw up a warning if they disagree. So for IFR aircraft I'm a big proponent of dual GSU25's and a G5, that way you have 3 independent sources and a tie breaker.

[mfleming]

Originally Posted by David Carter

One of the things I learned when I went to the AEA's Avionics Installation for Experimental Aircraft course was that you do not want to bolt the ADAHRS to the back of the GDU. Yes, there are mounting hole there to do this. However, there are a couple of problems with doing it. One is vibration. The panel & G3X aren't stiff enough to prevent this, and the vibration interferes with calibration. There are also servicability issues. Removing a GDU gives you great access to everything else behind the panel. Putting the GSU 25 on the back of the GDU makes that more difficult due to the pitot static tubing.

Interesting, so where do we mount the GSU 25's then? Stein says he mounts them to the back but you're right, a previous poster had trouble with vibration.

Originally Posted by Walt

One big advantage to dual GSU25's is the G3X compares their data and will throw up a warning if they disagree. So for IFR aircraft I'm a big proponent of dual GSU25's and a G5, that way you have 3 independent sources and a tie breaker.

My IFR flying in the clouds will be minimal to say the least, maybe a transition through a marine layer on occasion. These new panels are amazing and just think how we would punch up through a layer with one artificial horizon and a sketchy vacuum pump

[cajunwings]

Originally Posted by Walt

One big advantage to dual GSU25's is the G3X compares their data and will throw up a warning if they disagree. So for IFR aircraft I'm a big proponent of dual GSU25's and a G5, that way you have 3 independent sources and a tie breaker.

Walt: What is your preferred mounting location for the GSU?s on the side by side RV?s with dual G3x?s. Thanks

Don Broussard
RV9 Rebuild in Progress
57 Pacer

[Walt]

Originally Posted by cajunwings

Walt: What is your preferred mounting location for the GSU?s on the side by side RV?s with dual G3x?s. Thanks

Don Broussard
RV9 Rebuild in Progress
57 Pacer

I never mount to screens, I generally use the sub panel on the OB ends where they are more rigid.

[mfleming]

Originally Posted by Walt

I never mount to screens, I generally use the sub panel on the OB ends where they are more rigid.

Walt, do you have any photos of that kind of mount

[Walt]

Originally Posted by mfleming

Walt, do you have any photos of that kind of mount

Here's a pic of the way I mounted mine on a little shelf, supported by the sub panel and on each side by the rib and side-rail for a good solid mount. I did it this way on mine as I previously had some large cutouts in the sub panel and didn't feel that it had enough rigidity.



Here's an RV9 subpanel mount which is the way I typically mount them. Mounting both AHRS with a GAD27 beneath helps to increase the rigidity of the subpanel even more.



RV9 finished product in case you're interested!

[mfleming]

Originally Posted by Walt

Here's a pic of the way I mounted mine on a little shelf, supported on each side by the panel rib and side-rail for a good solid mount. I did it this way on mine as I previously had some large cutouts in the sub panel and didn't feel that it had enough rigidity.



Here's an RV9 subpanel mount which is the way I typically mount them. Mounting both AHRS with a GAD27 beneath helps to increase the rigidity of the subpanel even more.



RV9 finished product in case you're interested!

Very nice. It makes sense not to hang that off the back of the GDU-460.

PM'ed you.

[cajunwings]

Thanks Walt. You always a lot of help and I appreciate you sharing what you know.

Don Broussard
RV9 Rebuild in Progress
57 Pacer

[mfleming]

Is a "Hook up chart the same as a wiring drawing?

Monday I'm ordering all the components to wire the panel from SteinAir. One of the items is an Avionics Interconnect Drawing.

Just wondering if the hook up chart and the Avionics Interconnect Drawing are the same thing?