One of the cool things about this stage of the project is that after a few hours of wiring I can turn on some part of the RV’s avionics and see it work.
For instance, I’ve had these Oplite 6 LED lights for several years now and finally got them wired up to the Garmin GAD-27 as instrument panel lights, so they’re controllable by a dimmer on the panel. These lights are really rugged and when driven by one of the GAD-27’s PWM lighting controllers, they’re dead quiet too – no hash on the radio like I’ve encountered with some other dimmers. Very cool.
I’ve also had Whelen LED nav/strobe lights sitting around for a few years, waiting for installation. The tail nav/strobe is finally wired through to the cockpit, and here’s some video to show how damn bright they are…low current draw too, and no need for a heavy strobe pack like older nav/strobe lighting systems.
Next on the list was wiring the flap motor, but I need some hardware to fabricate a mounting bracket. So, I jumped ahead to wiring the Advanced Flight Systems Angle-of-Attack (AoA) system. This is the only “legacy” avionics system on the airplane, as Advanced doesn’t sell it anymore. I hope it doesn’t fail.
For those of you who aren’t into aerodynamics, AoA is the angle at which the wing meets oncoming air, thus generating lift. If AoA exceeds a certain value, the wing stalls and lift is drastically reduced – so you can see why knowing AoA might be important for staying in the air. If you’re really into the concept, watch this video.
Everything lights up, and the self-test lady says the system is working…
Of course with all the gee-whiz stuff lit up, I had to take a picture. Enjoy!
I’ve been checking off some smaller tasks from my to-do list, one of which is figuring out where to mount the Pilot and Co-Pilot headset jacks. I didn’t want them hanging from the panel, so I put them on the cover plates in front of the wing spar bulkhead.
These covers are sold by Aircraft Spruce, and they worked really well.
Sometimes all those little individual tasks you’re churning on, come together in a moment of progress. Tonight was one of those nights – the battery contactor and avionics relay switches are now active, and the main and avionics busses are connected. It’s time to flip a few switches…
Lots more wiring to do, but motivation is high.
Even more fun with wiring…working my way forward from the tail I routed serial data and power wires to the ELT and assembled the autopilot pitch servo DSub connector.
I also ran coax to the GTN-650 GPS and G3x GPS/XM antennae.
Assembling coax connectors is fun, at least for me…
More to follow as I work my way forward to the cockpit.
Back from Thanksgiving with family at Bear Ass Cove on Newfound Lake, New Hampshire and guess what UPS delivered? That’s right – the avionics harness!
I’m almost ready to install the harness – just a couple of empennage things left to finish – but I couldn’t resist stretching it out. This is, essentially, the Mighty RV’s nervous system and having it fabricated by the neurosurgeons at Approach Fast Stack is saving me a *ton* of build time. Cool!
Finally getting a lot of little cleanup tasks done while the avionics harness is percolating at Approach FastStack.
First, I installed this…
First person to guess what it is gets a ThermosWorks sticker or a free beer at Oshkosh 2019.
Second, I dug out the cockpit lights from Oplite and fabricated a small bracket to mount them on the roll bar support.
These lights are extremely well-made by my friend and fellow RV builder Rich Mileika. In addition to Oplite, Rich owns and operates Machine, Inc, a precision machining company in the greater Boston area. If you need quality cockpit lighting, try Oplite…you’ll like ’em.
And lastly, I replaced the stock Van’s flap motor with an upgraded version made by Pat Hatch at PH Aviation Services.
This motor has several advantages over the stock unit. The motor and jackscrew are separate so grease can’t migrate into the motor windings, a common problem with the Vans motor. It also has limit switches to stop the motor at full extension on either end, and also has a position sensor to report flap position to whatever device needs it.
The only downside is that the flap support bracket must be modified to accommodate the new motor. Rather than trying to rework the existing bracket, I bought new parts from Vans and started from scratch…only took a couple of hours, and Pat’s motor will save some wiring work later on.
…is getting brighter – it’s time to start installing and wiring avionics. I’ve been plotting and planning how to mount the Garmin G3x Touch system, radios and transponders and I’ve settled on building a tray which will hold all the remote-mounted LRUs, Comm 2 and transponder.
Here’s a cardboard mockup.
…and the tray with avionics temporarily attached.
The GAD 27 and GAD 29 are on the right side. Most of the airframe power interfaces will be through the right firewall passthrough so having these boxes on the right should make wiring a little more straightforward.
The GEA 24 engine interface is on the left side as most of the engine sensor wires will come through the left firewall passthrough. Guess where the AoA CPU is going?
More pics? Sure, I’m glad you asked.
We don’t plan on painting the RV for awhile, so I called Jonathan McCormick at Evoke Aviation – our painter of choice – and asked for his recommendation about how to protect the cowl ’til time for paint. His recommendation was K36 high-build epoxy primer…so that’s what we used.
The oil filler door looks good, although I’ll likely end up sanding down the sides a little to increase the gap for painting later on.
And the cowl pin covers look great…couldn’t be happier with how they came out. They were worth all the work!
I disassembled the cowl and laid down some heat-reflective adhesive aluminum to help protect against hot spots from the engine. Sorry, no pictures of that!
Following the instructions for UV SmoothPrime, I’ve laid down several coats and each one means a lot of sanding. Fortunately, it sands pretty easily and seems to do a good job filling any voids or pinholes left after the coats of micro and epoxy I applied.
It’s a little splotchy in some spots, but it’s good enough for the high-build epoxy that’ll cover everything until paint.
There are a lot of gaps in the blog since February because any spare time I have has gone to building and not to blogging. So in the spirit of documenting this build in an efficient manner, I’m gonna “micro-blog” and just cover a single day’s work…so there.
The pink cowl is no more. I put on the first three coats of UV Smooth Prime with a roller and after drying for a day or so I’ll sand it down and put on the final coats.
The pink cowl…
And the the white cowl…