Sunday, December 8, 2024

Subpanel - ADSB & Transponder

The subpanel work continues.  I came close to making a mistake in placement of the ADSB and transponder.  I looked at a diagram from AFS that showed some suggested mounting locations on a RV7 (same as RV9).  It had the ADSB and transponder up near the top of the right side of the subpanel.  It seemed fine, so I started to lay things out.  That's when I realized that their diagram was for a slider canopy, not a tipup.  When the tipup canopy is closed, the front of its frame takes up almost 2" of space at the top of the subpanel.  Thankfully I realized that before I drilled any holes.  I moved the boxes down to clear the the frame and mounted all of the nutplates for them.

Once I buy the Dynon radio, that box will probably go right next to the ADSB (that's the black one).  Hopefully that gives enough space for the center radio stack, which is going to require a big hole to be cut into the subpanel to allow for the depth of the eventual IFR GPS.  Not being able to slide things up towards the top of the subpanel really limits the available real estate.  Things are going to be a lot tighter than I thought.  If push comes to shove and I don't have enough room on the subpanel itself, I will create some brackets to mount additional boxes between the panel and subpanel.


In preparation for routing the wires from the firewall to the subpanel, I riveted a cross brace in between the two outer ribs.  This will give me more flexibility in where I can put wire bundles.


The last thing I did today was route the static tubing from the tailcone up to the panel.  The AFS screens don't need the static input at the panel (the ADAHRS for the screens will set behind the baggage bulkhead and the static/pitot/AOA lines go there), but any backup EFIS that I use will require a static line to be the most accurate.  The Garmin G5, which I'll probably use as my backup, can operate without the static info, but having it allows it to be more accurate by not just relying on GPS data.  The tubing runs just under the longeron, so aside from being seen in the baggage area, it should be completely hidden.