Dec 28-30 -- Rear Spar and Ribs

Puttered at replacing the parts that I messed up the other day, and some "work work" that ate almost two full days. Then went back to the main wing ribs to make certain that they were square in all dimensions. Used a machinist's square, the flanging tool, and also a fluting tool.

Oh, and you can see my high-end storage approach to the spars. Am still trying to avoid building the stand for these spars, in hopes that my garage will somehow get bigger via positive thinking.

Next up is drilling holes for conduit in the ribs. But first I need to figure out how many conduit and pitot runs are required for all the various systems. Realized today that I even need to pick out an autopilot, because its time to install servo mounting brackets. Leaning towards a Dynon, but am going to bounce this off others before deciding.

Lots of deferred decisions are suddenly rearing their heads. Suppose that's a sign of progress!

Total Time: 5 hours

Dec 19-27 -- Rear Spar

Been working on the rear spar for days, yet it seemed so simple...

Initial challenge was priming parts outside in the dark. A total of five nights -- each time going back to touch up one more spot. Finally had some daytime on Dec 23rd when I came home early. Should have just waited :)

Then there was the matter of working on the plane while quite sick with a bad cold that made me woozy. Lesson learned: don't.

So I also managed to screw up a couple of parts, which I am now waiting for from Van's. These were installed and looked very nice indeed! Until I discovered (a) a missing row of dimples, and (b) that I has countersunk the wrong holes in the doubler. Oh well, now an expert at drilling out rivets...

These are the parts that are in the top of the lower right photo. New parts will be here in a day or two.

Total time: 6 hours

Dec 18 -- Drill and Prime Rear Wing Spar Doublers

Hard to believe that it took all day to accomplish this, but it did. 9:30-5:30 to be precise, with a couple of breaks for things such as eating.

Shaped and match drilled the various doublers for the rear spar, with a oblong hole for the ailerons accounting for quite a bit of this time. Also dimpled and countersunk a number of holes.

Then used ScotchBrite to scuff the doublers and both rear spars. Had hoped to prime today; however by the time that I finished all of this, it was too dark outside to paint.

The result doesn't look a heck of a lot different than the previous post, does it?

In the end I decided that even a bad prime job was north of not even trying. So I set things up to prime where some light is afforded by the fixture on the front of the garage. Might have to touch up the front of the house if overspray "decorated" the garage door, but it's worth that amount of bother.

Total Time: 7 Hours

Dec 17 -- Deburr Rear Wing Spar and Doublers

Deburred the rear spar channel (W-907A), doubler plate (W-907B), and all related doubler plates (W-907C, W-907D, and W-907E).

Total Time: 2 Hours

Dec 16 -- Final Nutplates on Main Spar

This is going to seem like a weird post because the only progress is 6 nutplates. However they were a Big Deal in terms of hassle.

For starters, the nutplates are on the drawing but I can't find any reference to them in the instructions. Other RV-9 blogs voice a similar concern. So hopefully they are installed correctly!

The countersink cage wouldn't fit into some corners, and I spent several days and trips to the store looking for creative workarounds. Then I found the tool. In my tool box! Doh... There's a photo of the bad boy below.

Also, some of those rivets look funky. However when I carefully checked them, they are actually just fine other than one that is countersunk 0.001" deep.

At any rate, we'll call this 3 hours of work, but that's a lie on the way low end of time wasted. Looks like it's on to the rear spar next.

Total Time: 3 Hours

Dec -- Install Aileron Bellcrank Brackets & APEX Plates

This seems like such a small thing, but took a fair bit of work for the details. Installed the aluminum APEX parts to act both as a tie-down ring mount point, and also to hold the aileron bellcrank brackets.

Torqued all AN-3 bolts to 25 inch-pounds.

Total Time: 3 hours

Nov 23-27 -- Install Nutplates

This is getting repetitive: installed more nutplates of varying sizes in varying locations, over a period of several days.

Unfortunately my attempt to drill holes for the Apex tiedown bars did not go well. The first one suffered from layout issues that made the holes off-center. Bottom line is that a ruler plus marking pen is simply inadequate for accuracy. Looking online, it appears that others pioneered this mistake well in advance of today.

On the second bar, I was able to produce a unique piece of art. The work scooted under the edge if the stop on the saw. Result: wrecked aluminum and broken tooth on the aluminum saw. Luckily the blade held together, so no amputations. Ordered a new blade, two new hunks of aluminum, and a beer.

BTW, for others building RVs, these apex plates can be ordered with the pain of tapping the hole already finished. See Cleaveland Tool's website.

Total Time: 3 hours

Nov 21 -- Install Nutplates

This is going to be a series of boring posts. Tonight I installed 8 of 24 nutplates that will hold access plates attached to the wing spar.

Total Time: 1.5 hours

Nov 19 -- Finish Nutplates for Fuel Tanks

Exciting, huh? Spent all day attaching a gazillion nutplates for the fuel tanks. Guess that's penance for having fun flying the Luscombe yesterday. But it does make for completion of one paragraph in the instructions!

Total Time: 7 hours

Nov 17 -- More Holes

Tonight consisted of three tasks -- and I will be at these for quite some time.

First, I primed a bunch of nutplates. They are plain steel, so if anything ever needed priming in the Pacific Northwest, these nutplates would be at the top of the list. Note that the photo shows two types. I only used the flat (small) ones, but figured that I may as well prime some of each.

Then each center hole was drilled to 3/16" (instructions are very vague here), and the bottom of each hole was deburred.

Next up was to create a template piece of metal to use for testing countersink depths. The aluminum test piece is the same thickness as the tank skins (0.032"), and dimpled for a #8 screw.

I started installing nutplates, one or two at a time, and riveted them in place. The nutplate will sever to center the countersink bit.

Set up my new single-fluke bit and gingerly drilled to the correct depth, testing with just the screw and also with the metal template to make certain that all is correct. Think that I need to go just a touch deeper; however want someone else to look at my work first. Easy to drill deeper, but not so easy if the holes are too deep...

Total Time: 2 hours

Nov 16 -- Countersink Wing Spar

Tonight was Hole City. Counter-sank half of the holes in both of the wing spars (where the fuel tanks will bolt on). All this made possible by the arrival of new single-flute countersink bits, because the old ones were too dull to work. This countersink is sooo much nicer than the standard ones!

Building both wings at the same time, so overall progress will be faster due to efficiencies. Or at least that's the lie that I am telling myself.

Not much else to say, other than there are still lots of holes to work on!

Total Time: 1.5 hours

Nov 12 -- Start Wing Spars

Big day in that the two wing spars, which had been leaning against the garage wall since last April, finally slid out of their plastic bags to join the project. They are supposed to be hung on a wing stand; however I am delaying that day until really needed, because the stands burn up a lot of real estate in the garage.

Once out, I also opened up the many hardware bags of rivets, screws, and fittings. Tucked each of them away in a wall-storage bin with clear plastic drawers. Hopefully the parts organization is logical enough to find the parts when needed later.

And finally the first couple of nutplate rivet holes were countersunk.

Below are photos that are mostly for the records -- and that show the hand-etched serial numbers of each spar.

Total Time: 7 Hours

Nov 9-11 -- Build a Rib Flange Straightening Tool

Tonight's mission is to build a straightening tool for the rib flanges. A video of the idea is here, and a fancier tool was found in a Van's Air Force forum post.

Well, "tonight" turned into three nights thanks to interruptions such as the family's Domain Controller crashing, a surprise launch of a new Amazon Web Services region, etc., etc. Nonetheless, the two photos below represent the tool. This puppy is slick, and initial tests indicate that I should save a ton of time on the wings. Just wish that I'd built it for the empennage ribs...

The base and wood immediately on top of the base are pine. All wood directly attached to the metal sidebars is maple from my scrap box. That maple was originally intended for new cabinets, but I know that you won't tell anyone!

Here's the bill of material, if you want to build your own:

• 1 ea. 2x6, cut to 18" long
• 1 ea. 2x4, cut to 10" long with an 11 degree undercut bevel on the "business end"
• 1 ea 1x1-1/2 maple (or any hardwood). I cut mine to 16" and it could be longer. Also thing that a 2x2 might be sturdier -- this handle takes a lot of abuse
• 1 ea 3" long block, made from the same maple stock. I used my biscuit jointer to insert a couple of wood biscuits and glue up a double-height block. Probably overkill, but I got to play with more toys that way.
• 1 ea. 3/16x1x3ft Weld steel flat bar, purchased at Lowes and cut into 2 ea 10" lengths. OK, cut into 12" lengths and then shortened to 10" when I screwed up alignment on 1/4" holes in one end.
• 2 ea. 1/4-20 x 2-1/2 bolts, also from Lowes Aircraft Supply. These are not aircraft grade bolts -- they just look like it.
• Washers and self-locking nuts for the bolts. I managed to purchase 1/4-20 bolts and 28-TPI nuts. Like I said, Lowes is not aircraft grade -- and mixing things up like they did was annoying. Fortunately I had nuts on hand.

Total Time: 2.5 hours (not counting going to Lowes to find a hunk of steel).

Nov 8 -- Deburr Wing Ribs

Tonight was straightforward: Crack open a stack of wing ribs and de-burr the edges on them.

Still need to de-burr all the rivet holes.

Total time: 1.5 hours

Nov 5-6 -- Finish Empennage

Last post on July 4, and in between was pretty much all travel. Around the world sounds like the adventure of a lifetime, until you do it twice in ten months...

This weekend was back at the project, and it was momentous! Finished work on the empennage, or at least as much work as can be done right now. Fiberglass tips and final assembly come at the end of the project.

Built trim tab #3, which came out great, assembled the elevators to the horizontal stab, and drilled an important hole in the elevator horns.

But not until a friend with a flying RV came over to eyeball my work. As per one of the photos below, alignment was off a bit once parts were assembled. Everyone told me that this is normal, although that seems odd in a CNC environment.

In order to drill that hole thru the center bearing, I used some punches from Harbor Freight that fit precisely into a wide variety of hole sizes. In this case it was a 1/4" pin that created the dimple to use as a starting point for the drill. After a #40 pilot hole, worked my way up thru a #30 to a 1/4" bit. The #30 intermediate hole included part of my finger, although I decided that assembling the finger at this time might be inconvenient.

I also realized how woefully dull my inherited drill bits are, so I ordered $300 worth of new cobalt drill indexes -- the first time in my life that I actually purchased all the bits new as a set. Probably should have done this years ago.

All parts now hanging on the garage wall, and it's time to start on the wings.

Total Time this weekend: 19 hours

July 4 -- Build Tool to Insert Elevator Bolts

The instructions say that it's time to attach the elevators to the horizontal stabilizer, in order to check clearances and drill another hole. Yikes, this whole assembly process is a royal pain, and it took lots of searching online to see what others did. So here's a post on a tool that I built, and two other tips. Hope it saves others some time. (Sorry, no help on the agony bit...)

First, it's tough to slide a bolt thru the holes because it's tough to align the parts. Someone else posted a tip that allen wrenches make a great pin because the 90 degree bend acts as a handle. Even better, use a small one first, then guide a larger one into place. See below for a photo of the larger inserted into the assembly.

Even with this trick, it's still a pain to insert the bolt. In fact, I was speaking like a pirate while I tried with no success... Then I saw a tool that Dave Parsons built for his RV project. Mine is less refined, but works like a charm! I flattened out a couple of leftover pieces of aluminum that began life as stiffeners. The 1" belt sander worked well to cut a slot and generally shape things, followed by some metal forming in the vise. Wow, does this thing work well!

Finally, it was still tough to slide the bolt all the way home. Cleco pliers solved that!

Next up is figuring out what's rubbing. I am fairly certain that the rubbing comes from a rivet shop head that stands too tall. But not much time this weekend for building. Squandered the available time flying, bike riding, and refinishing the deck. What a spectacular Fourth of July!

Total Time: 3 Hours

Jun 30 -- Installed Counterweights

Not much to say. Some trimming to clear rivets, bolted 'em on. Bigger news is that it now sounds like all of August except for a few days will be spent traveling for business. Not good for enjoying summer or for build progress.

Like everything, tonight took way longer than it sounds like it should have.

Total Time: 1 Hour