Tuesday, May 26, 2015

Tuesday, May 26th, 2015 finish the radio stack, map box, vp/x mounting, avionics layout

We've been doing the annual on our group's Cherokee, which unfortunately ran into a couple of major snags we hadn't expected. Ended up spending most of the last couple of weeks working on that instead of my project. Can't complain.

 We do owner assisted annuals, and I've learned so much from Nick (whose Dad was an A&P) and our A&P that it's well worth the time spent. I always learn something new and nearly always get to work on something I'm about to do or need to do on my own project.

I was able to finish up the radio stack.  I included more pictures of what I did.  I can't claim it's the best way, but it did work pretty well.  When I went looking to see what other folks had done I didn't find much but some taped together mockups and what it looked like from the front when it was done.  Not a lot of help in other words.  FWIW, this is what I did.

I cut out the hole in the sub panel with a jig saw.  It has a fine blade and did a pretty good job, but once a fair amount of the material was cut I had to support the heck out of it to keep it from jumping all over the place.  Then a mill bastard file did the rest.  I used blue tape as a "cut to" line to make sure I'd removed enough material.

BTW - I arrived at this shape by using a couple of different squares to project the front opening to the rear - it's not really a straight line, so you can't lay them on top of each other (at least i couldn't figure out a reliable way to).

It worked out really well and the opening was almost exactly the right size, and is within 1/8" all around, which works for me.

From Finish Kit

I removed the ribs and center section so I could do the test fitting and filing on my workbench.

From Finish Kit
I wasn't sure how deep the trays needed to be mounted so the faceplate would fit flush with the panel, so I did quite a bit of tweaking on each tray to make sure it all fit.  The only real gotcha was my SL40 was a bit rough along the sides, so I had to file a bit deeper groove.  Bill at Up North had the groove perfectly placed and the depth would have been correct but for the side tabs being a bit rough.

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The rest was just putting each in place, measuring a bunch of times, clamping it tightly, then marking the side angles for drilling.

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I would mark it, then remove the angle, drill and bolt it in.  I mostly used #6 flush head screws, but my Icom worked better with #8, so I used those on the A210 tray.

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GPS 400 tray fits great.  Rinse and repeat.

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This is everything in place, but the rails not yet drilled to the front panel.

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Back side view.  I want everything to be removable so I can swap stuff out if I need to, plus it will leave a nice hole if I need to get behind the panel to work on wiring.  The entire panel will be removable as well for good access.

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Last setup before I mark and back drill the angle to the front panel.

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From Finish Kit

Nut plates mounted (these are #6 as well) and drilled to the front panel.

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I planned for a pretty snug fit in the sub panel.  I don't want the stack bouncing around in turbulence.  I originally thought to put an angle support below, but decided to mount about a long piece of angle and attach to the two aft holes on the GPS 400 mount.  The rest fits snugly enough it won't move.  I also plan to use edge grommet or some other anti chafe material around the periphery of the sub panel cutout.

From Finish Kit

Test fit in the aircraft.

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All the avionics installed and snugged up.  Very happy with how it came out.

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Starting on the map box from Van's.

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Finished riveting.  I used flush rivets all around for a smooth finish inside.  I just back riveted everything.

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Test fit in the sub panel.  I had Bill cut the panel based on the CD plans I got from Van's, and the dimensions were bang on.  I think I will make it removable as well - #6 nutplates on the front flange.

From Finish Kit

I'd like to find a flush latch, but haven't found anything I like yet.  I should have had Bill relieve the bottom side of the cutout for the hinge.  I originally planned to put it inside but should have realized that wouldn't work.  Had to spend about an hour filing the lower edge down to get a good fit for the piano hinge.  Hinge will be flush riveted as well.

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Next project was to find a home for the VPX.  I probably spent a couple of hours trying various things before I settled on mounting it upside down below the two left side forward ribs behind the sub panel.  I used some of the extra angle I got with the wing kit to fab a couple of rails.  Everything will get nutplates so it's easily removable.

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Top view.  There is enough room to put something above or behind the sub panel.  I don't plan to put anything above but definitely plan to use the back side of the sub panel.

From Finish Kit

Lower view.  Most of the power will be doing either forward and down or to the right, so the large power on the right side will work well.  If not, it's easily reversed because all the holes are symmetrical.

From Finish Kit
From Finish Kit

Tuesday, May 12, 2015

Monday, May 11th, 2015 - oil cooler, electrical, panel, avionics

This will be a long post - there is a lot to catch up on.  I arrived at the point where I really had to make some decisions regarding the electrical system, and spent a lot of time reading, doing research and talking to folks.  I also found some good deals on avionics I needed, particularly the Garmin GPS 400W I was looking for.

Finished up the oil cooler mounting.  The plans call for removing part of the mounting flange to provide sufficient clearance between it and the engine mount.  I taped up all the cooling fins so there would be no possibility of getting any filings in the fins and possibly reducing the airflow or clogging it in some way.


From Finish Kit

Once the flange was ground down I was able to mount the cooler on the aft baffle.

From Finish Kit

Plenty of clearance between the cooler and the engine mount.  I'll run the oil lines later.  I'm not totally sure if I will have to take this off again or not.

From Finish Kit


Jesse Saint at Saint Aviation picked up a salvaged RV that was involved in an accident (no one hurt thankfully) and put the Garmin up on the classifieds at ==VAF==.  I've found quite a lot of good gear and deals there, but this was the best.

Here's the GPS 400W I got from Jesse.  Almost brand new.  Came with a terrain card, but no data card.  Not surprising - those dudes are pricey.  I took it over to Jim at Bay Avionics and had him bench test it.  He yellow tagged it and said it worked perfectly.  :))))  I'm sure Jesse would stand behind it, but it was a relief to know it was in good shape.  Jesse also included the antenna and tray/shells.  This will allow me to fly IFR, including coupled approaches with the Dynon A/P, as well as serve as a certified source for ADS/B out.

From Finish Kit

I was looking for a second comm radio and Jesse happened to have a couple of Icom A210s at a very good price, so I picked one of those up as well.  I already had an SL40 I purchased from Mitch Locke (Van's east coast representative), so I'll have 2 comm radios as well.

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Got out the carb so I could document the serial number and make sure it was in good shape, but deferred on putting it on in case I had to take it back off.  I only have a couple of gaskets.

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Once I was done with that it was time to finalize the panel.  I cut out a piece of masonite board the same size as the panel so I could put full size instrument mockups (or the instruments themselves if I had them) in there to check for fit as well as sit in it until I was comfortable with the switches and avionics setup.  This is pretty much the final version, although I changed my mind and decided to go with the Vertical Power VPX Sport instead of breakers.

After a lot of research, I decided to have Bill at

From Finish Kit

I was not sure the D-10A (small rectangular instrument in the upper left of the panel) would fit since it's pretty deep and the skin slopes down, so I cut out the mount and mounted it in my panel mockup.  It will need a hole behind it to allow connection of the d-sub cabling and the pitot-static/AOA tubing, but it fits just fine.

From Finish Kit
Another shot to verify the D-10 clears ok.

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I plan to have the ADS/B unit wired up - including the antenna - even if I don't purchase it right away.  I picked up the Delta Pop ADS/B antenna from them.  They are great to deal with and the antenna appears to be a good quality unit.

From Finish Kit

In the midst of all the planning (which is basically desk time) I decided to go ahead and run the static tube forward to supply the D-10A.  These are the clips I will use to hold the static tube going forward - they'll get riveted to the upper longeron when I rivet on the top skins.

From Finish Kit
Completed clips.

From Finish Kit

Another project was to figure out how to make up the radio stack.  Won't really get to the details until I have the panel cut and can then cut the sub panel for clearance.

From Finish Kit

Test fitting the radio stack.  GPS on the bottom, then Icom A210, SL40, and on top will be a new GMA 240.

From Finish Kit

After talking to a bunch of people and doing some research, I decided to have Bill at Up North Aviation do my panel.  I sent him a screenshot of something I mocked up in a free panel planning program, then we tweaked it over a period of about 2 weeks.  He is great to work with.  Once we had it close he created a full size PDF and sent it to me.  I printed it out on a large roll fed HP plotter and cut it out to fit my test panel.  The drawing he sent had a scale on it so that I could measure the print against an actual ruler - if the dimensions didn't match, the print wasn't the right size.  We ended up doing 5 or 6 rounds of mods, adding things I'd forgotten, tweaking things here and there and in some cases moving them 1/4" or so until it was perfect.  I was extremely happy with the process, and Bill worked with me as much as it took to make sure it matched up.

I had already sent him my Van's panel with a deposit, and once everything was finalized and dimensions were correct he cut it on his CNC panel cutter. Beautiful work - everything fit perfectly.  I'd highly recommend him.  No way I could have done the kind of work he did, and I think the price was very reasonable.  Highly recommend him.

Here's the first of a series of full size drawings I tested with.

From Finish Kit

This is getting near finalized.  I got a cheap piece of acrylic at Lowe's and spray glued the printout to it then cut it all out.  The acrylic was almost the exact same thickness as the aluminum panel, although much floppier obviously.  I ended up moving the radio stack to the left about 3/16" so the angle on the back side would have clearance.

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Example of the reference scale he gave me.  This is the final print before we decided to cut the panel for real.

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I received by Skyview the day before we were going to cut, so I was able to put the real deal in instead of my foam mockup.  This just confirmed we had everything correctly placed & sized.

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Final mockup before cutting.

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Here's the finished panel from Bill. Since I'm putting a map box on the right side, he offered to cut me a door from a piece of scrap.  You can just make it out from the different grain.  It fits like a piece of furniture inlay - perfect fit - you can just barely see the seam.  Very happy with this.

From Finish Kit

And here it is with some actual avionics in it.  Since I have the VPX and most of the other components, I can start laying out the gear behind the panel and figure out where everything will go.

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Here's the VP-X Sport from Vertical Power.  It's an electronic circuit breaker box that interfaces with the Dynon (and other EFIS panels) and eliminates nearly all the circuit protection as well as giving a lot of flexibility (the breakers can be set in software to any value you want).


From Finish Kit
From Finish Kit

The other really great piece of gear I ended up going with is the Approach Fast Stack system.  This is a passive cross connect (PMA'd no less - so it's certified) that can cross connect virtually any avionics with the right cables.  I had them make up cables for the GMA 240, Skyview, GPS 400W, the Comm radios, Dynon ARINC, ELT, transponder, etc.

The cool thing is if I ever add another EFIS or change to a new GPS or something, all I have to do is call them and get the new cable.  The other really interesting feature is it will share the GPS data with the transponder and the D-10A so I can use the D-10A with the GPS as well.  Slick.  All you have to do is connect the power to the boxes and you're pretty much done.

When we added a GNS430 to our Cherokee, the avionics wiring cost nearly $5,000 and took more than a week.  This does the same thing for way less than 1/2 the price.

Just for reference, I had several avionics shops quote the panel wiring for breakers, switches and all the gear I have.  The *best* quote was over $8,000.  Most were north of $10,000.

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From Finish Kit

Back side of the Skyview - checking the clearance on the cables.

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Dynon transponder - this will interface with the ADS/B and GPS to provide ADS/B in/out for 2020  compliance.

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Dynon EMS (engine monitoring system).  There are two large dsub connectors on the other side that provide tach, oil pressure/temperature, fuel flow, carb inlet temp, manifold pressure, cht and egt readings for all 4 cylinders and a bunch of other stuff.  Replaces a whole panel full of instruments.

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Cut the hole for cable and plumbing for the D-10A.

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Laid out and cut the hole in the sub panel for the Van's map box.

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Front side of the map box.  I plan to come up with a flush mount hinge and latch so it's push to open (not magnetic obviously - it will have to be some type of mechanical latch system).  McMaster Carr and some others have units that should be suitable.

From Finish Kit