Riveting the Wings Rear Spar

I found a little time to finish up the rear spars for the wings tonight.  I had let the AKZO cure for a few days while Tammy was off so we did family time during those days.  Tammy was back at work tonight, so I pulled the primered parts from the booth and riveted them together. I started out on the left rear spar since it is the one that is specifically shown in the plans.  The right one is not in the plans, and Vans assumes we know how to mirror the left for the right wing.  First thing was to cleco the doublers to the rear spar as well as the reinforcement forks and its doubler plate.

Next, we have to carefully match up which holes need rivets, as some of the holes will be used to hold the spar, doublers ribs and even the gap seals for the aileron and flaps. I used masking tape at first to cover up the holes that don’t get rivets right now and then clecoed everything together.

In the last photo above, you can see where I just used a sharpie to mark the holes the DO NOT get rivets instead of using masking tape.  After looking over the plans, we are only going to be using three different rivet sizes.  AN470AD4-4 for the thinner doubler plates, AN470AD4-6 for the reinforcement fork to rear spar, and finally AN470AD4-8 for the reinforcement fork, its doubler plate and the rear spar.  To make my work more efficient, I decided to start with the smaller rivets first, setup my squeezer for them and then do all of the 4-4 rivets on both rear spars, and then just adjust the squeezer for the next size and repeat.  So, I went ahead and clecoed the right wing rear spar parts together, making sure to mirror their orientation to the left wing.  Since there are only a few rivets on some of these doubler, I just decided to circle the ones I needed to squeeze instead of using masking tape for the right rear spar.

Then it was time to squeeze.  I started out with the AN470AD4-4 rivets and adjusted my squeezer until the rivet was setting perfectly against the rivet gauge, and the I went and squeezed all of the 4-4 sized rivets on both the left and right rear spars, always checking each one with the rivet gauge (I am picky about this). Once I had them all done, I moved up to the AN470AD4-6 rivets and did the same thing for both sides, and then finally finished up by riveting the handful of the larger AN470AD4-8 rivets. Each rivet was checked with the gauge for precision.

You’ll notice that on the reinforcement fork, I set the rivets with the manufactured head on the thickest metal.  While this isn’t technically correct, I needed to be sure I would have space to squeeze the wing skins in the holes directly above those rivets.  However, on the thick doubler plate to reinforcement fork, you’ll notice that I did indeed set these with the manufactured head towards the thinnest (rear spar channel) metal which is technically how it should be.  While there is debate on how this should be done, this will be fine since even though the rear spar channel is indeed thinner than the reinforcement fork, it is still a thick piece of metal itself.  Had I been riveting the very thin skins to something thicker, I would made sure to put the manufactured head on the skin side. Here’s the required selfie of me and the completed rear spars to help prove I actually did the work for the repairmans certificate.

And that is pretty much it for tonights session.  It was only about 1 hour and 45 minutes of work for tonight, but this actually completed the assembly of the rear spars.  They will go back on the shelf along with the main spars until I have all these ribs deburred, drilled and primed; then I’ll pull them off the shelf and build the wing skeletons. Rib prep will be consuming quite a bit of time for the next couple of weeks, so I am going to have my metal wing stands built during this time frame, hoping they’ll be ready by the time I am done with the ribs. Here’s the photos from tonights work:

Google Photos Link:  https://goo.gl/photos/NX9zek3fvUcWvmSR7

Hours Worked: 1.75

Riveting the Rudder Trailing Edge

Tonight. I decided to take on the most difficult part of the empennage:  The Rudder Trailing Edge!  This one simple little piece of kit causes the most headache and heartache out of the entire tail section, and for good reason.  If you can’t get a good straight trailing edge on the rudder, you will have a hell of a time trying to get it all trimmed out and flying hands off.  I followed the Van’s recommendation (see previous posts) about using a piece of angle aluminum and Pro-sealing the trailing edge wedge into place and clecoing the trailing edge onto the aluminum angle to help it bond into a nice straight piece. That worked wonderful.  Then I used Van’s suggested method of double flush riveting the trailing edge.

To start off, I had to remove the angle that has been holding the trailing edge in its curing position for the last 18 or so days.  The Pro-seal had squished out a bit, and bonded the trailing edge to the angle, but it was pretty easy to separate and remove the angle. 

Once I had the angle off, I used a #40 drill bit in my hand to clear out the Pro-seal from al the rivet holes.  On quite a few of these holes, I had to use the deburring tool with very light pressure to remove some of the Pro-seal that oozed out into the dimple.  I also tried to clean up the edges and skin surface so that no Pro-seal would cause the trailing edge to not sit flush against the back riveting plate. I used some acetone to clean off the skin surfaces, because Pro-seal is some sticky stuff! Once it was all cleaned up, I inserted the AN4263-3.5 rivets and used some masking tape to hold the manufactured heads of the rivets into the dimples.

You can also see in the photo above, I numbered every rivet on the tape, and then wrote in my riveting sequence just above the numbers.  Van’s tells us to start off by half-way setting every 10th rivet using a back rivet set.  I started in the middle, and counted every 10th all the way to the top and bottom and marked the with the number “1”.  These would get set first.  Then I counted every 5th rivet and marked its sequence as number “2”.  Then I tried to roughly put my third sequence, number “3”, in between the 1’s and 2’s.

Just like the plans tells us, I flipped the rudder over and used my back rivet set on the tails of the rivets and the manufactured heads on the backing plate.  I have a longer backing plate so this made this part go really smooth.  I started out by half-setting all the number 1’s, then going back and doing the number 2’s and so on by working from the middle out on each sequence. Once I had them all half- way set, I flipped the rudder up to make sure the trailing edge was still perfectly straight….it was!!!

Now, I flipped the rudder over so that the tails of the rivets were facing the back rivet plate, and switched out the back rivet set on my rivet gun, for a mushroom style flush rivet set.  I used my same sequencing, and set the rivets fully by using the flush set against the manufactured head, and the tails were driven into the back rivet plate until they were nice and flush.  I only used the corner of my back rivet plate so that I could fit JUST the rivet I was working on against the plate, this would keep the other rivets from holding the trailing edge up away from the plate and causing it to bend.  It took a lot more fiddling to do this, but I think it made it turn out really straight.

After I had worked my way out from the center of the rudder, using my riveting sequence, I turned the rudder up to make sure it was straight:

Yeah….I am definitely happy with that!! It’s not exactly perfectly straight, but it is WAY closer than the 0.100″ than Van’s says is tolerable.  I held the trailing edge against my aluminum angle to get a comparison, and to measure against my dial calipers, the worst I could measure was only about 0.05″ to o.075″ which is perfectly acceptable.

Once I had the trailing edge done, I had a few more rivets to squeeze on the top and bottom ribs.  I had left these out to make it easier to apply the pro-seal, so its time to set those babies.  I was able to use my squeezer on all of them except the very last one closest to the trailing edge.  Vans’ says its fine to use a MK-319-BS blind rivet in these last holes because of the super tight clearances.  I decided that’d be the route I’d go, because I did NOT want to mess up this beautiful rudder with trying to squeeze or rivet that very end rivet!  So, I stuck in a MK-319-BS blind rivet, and carefully set it using a pop rivet tool.  They came out really nice, and are almost perfectly flush with the skins. When she’s painted, this will get a little bit of filler and you’ll never know it 🙂

The rudder is now 100% riveted together!  All that was left was to clean up the edges of the trailing edge with some scotchbrite pads to break the edges, as well as to knock off any squished out pro-seal.  Then I rounded off the corners of the trailing edge using a file and scotchrbite pads.  That’s it for tonight! I am happy to have this part behind me now.  I have been dreading it for a while, but it actually wasn’t to bad to do.  I set aside a day when I’d have plenty of tie to concentrate and get it done slowly and correctly. This rudder will fly straight as an arrow!

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Google photos Link: https://goo.gl/photos/auZhkD8hAYvLhdiH8

Hours Worked: 2.5

Closing up the Elevators

Tonight I was able to close up and rivet both the left and the right elevators. They had been setting and letting the proseal cure, and now it was time to close them up for good.  I started out with the easiest one first, the right elevator.  This one is pretty simple, as there is no trim tab to deal with. I removed every other cleco, inserted a rivet and then squeezed them with my squeezer.

Since this is all along the edges, I was able to use my squeezer on all but one rivet.  I was not able to get the nose of the squeezer in the very last rivet closest to the trailing edge.  There was just not enough room to get it in there and squeeze. I am thinking I will use a blind rivet in that one hole, which is perfectly acceptable by Vans’s plans, and even recommended for the very end holes due to the tightness of them.  All the rest of the rivets were perfect.

I was able to set every rivet except that one on the end. I will set the elevator to the side, and make a note on this one rivet.  Once I make a decision I will come back to it .  I do think a blind rivet is the way to go, since it doesn’t involve risking any damage to an otherwise perfect elevator.  On the the left elevator!

I did pretty much the same thing on the left elevator as the right: Started by removing every other cleco, then riveting those empty holes.  The only exception was the work around the trim tab.  I left the trim tab off for now, but placed the forward portion of the hinge to the elevator and clecoed it on.  The I very gently used a long nose squeezer with a set that would let me get behind the hinge bends to set the rivets.  I did this slowly and carefully to avoid bending the hinge, and it turned out great.

Then, I moved over to the few blind rivets that the left elevator requires.  There are a few MK319BS blind rivets that we need to use on the E-701 skin to the E-606PP spar on the very outboard sections, 4 total.  I set them and made sure they were completely flush.  Then I moved over to the bent tabs on the elevator at the trim tab section, and riveted them with MSP-42 blind rivets per the plans.

The left elevator came out looking really great. I stuck the trim tab on the elevator with the hinge pin to make sure everything still lined up good. The plans has us attach the trim tab by bending the pin, but I did not feel comfortable putting the elevator in storage with the trim tab attached and it flopping around.  I think I will leave it off to keep it safe. That’s all for tonight.  Here are all the photos:

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Google Photos Link: https://goo.gl/photos/DN8NBZXz4HrbjCLw8

Hours Worked: 1.5, 1.5

Closing up the Trim Tab

I am coming down to the finish line on this empennage kit.  Tonight I finished up with the elevator trim tab, and it is ready to be permanently attached.  I had gotten it nearly completed the last time I worked on it, but I needed to get the elevator riveted up so I’d have a finished surface to work with.  I started out the night by getting the trim tab lined up with the elevator.  The trailing edge is critical, and needs to be perfectly in trail with the elevator trailing edge.  Luckily, I had an easy way to make sure of this.  I had some left over 2×2 angle, so I laid one side of the angle under the elevator, and let the other side function as my straight edge.  I made sure the angle was sitting flush up against the trailing edge, and then I positioned the trim tab so that its trailing edge also fit flush against the angle.  This made sure that both trailing edges were perfectly in alignment.


Once I was happy that the trailing edge was flush, I double checked the edges on the inboard edges as well, to make sure they are aligned together. Then it was time to clamp it all down and get to match drilling.  I used a cleco side clamp to hold it, while I drilled the first hole on the inboard edge.  Then I cleco’d that hole and re-checked my alignment and drilled the outboard hole which held the E-721 trim tab hinge from loosing its alignment.

Then I removed the trim tab, but left the forward half of the trim tab hinge clecoed to the elevator. I used all of my cleco clamps to help hold the hinge flush against the E-616PP spar. This also helped hold the hinge steady while I gently match drilled the remaining holes, using the E-701 as a guide.

After I got the forward hinge drilled to the elevator, I removed everything, and then deburred all the holes, and cleaned up the edges of the hinge, rounding the corners.  The plans also has us mark and trim off the excess hinge from the inboard side, which was easy to complete. I dressed these edges as well.  Next up was to rivet the hinge to the trim tab itself.  I had triple checked that everything was still in alignment with the tab on the elevator, and then I drilled the holes for the end tabs on the inboard side of the trim tab, using a #40, followed by a #30 for final size.  I clecoed those holes and then removed the trim tab to rivet everything.  I riveted the trim tab hinge using my squeezer making sure I did not catch the loops of the hinge in the squeezer.  Riveting this hinge cause a slight bend in the loops, so I spent some time gently bending the loops back into alignment, using the hinge pin to make sure.  With that being done, I drilled the outboard end tabs and then used CS4-4 blind rivets to finish up both sides of the end tabs.  With that, the trim tab is done!

Here’s all the photos for tonights session:

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Google Photos Link: https://goo.gl/photos/pV1jmjChAmoVbwpH9

Hours Worked: 2.5

Closing and Finishing the Vertical Stabilizer

After completing the horizontal stabilizer in a previous work session, I decided to continue on and finish the vertical stabilizer.  The Tech Counselor came out this morning and approved all my work so far, and that means its safe to close these guys up and mark them as done!  I started out by clecoing the rear spar back on to the vertical stabilizer skin, we had removed it this morning so the inspector could take a good look at the riveting done inside.

Once the VS-803PP rear spar was clecod on, I inserted an AN426AD3-3.5 rivet into every other hole and used the squeezer to set the rivets. Once they were all done on both sides, I removed the clecos and then riveted those holes. Since I was able to use my squeezer, these rivets came out perfect:

Next up was to attach the VS-707 rib to the VS-803PP rear spar assembly using LP4-3 blind rivets.  These were easily done using the pop rivet tool, making sure to keep them flush with the parts when setting.

Finally, the last step was to rivet on the VS-704 end rib to the VS-803PP rear spar assembly using AN470AD4-6 rivets and then attaching the VS-706 tip rib to the rear spar using AN470AD4-4 rivets.  I used the squeezer on these guys, and they set really nicely. Its still very nice to see just how rigid everything ends up being once it all riveted together. These skins are nice and tight and have zero oil canning.

Here is a nice time lapse video I took of this session:

Of course, the obligatory happy selfie of the finished vertical stabilizer:

And here is all of the photos I took of tonights build:

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Google photos Link: https://goo.gl/photos/SX4DAd6o8eWHGtPu7

Hours Worked: 1

Riveting the Left Elevator

The primer has dried and cured on my left elevator parts, so theres only one thing left to do… Start assembly and riveting! I started out the session by bending the tabs on the elevator skin.  On this left skin, there are two tiny little tabs that must be folded over, just like the trim tab, in order to close the edge where the trim tab sits.  These also support the outboard edge of the skin, much like a rib would.  This is a very delicate operation, and one that can go wrong quickly.  When I bent the trim tab, I had a second one for a spare so I didn’t worry.  With this skin, I only have the one, and I have a ton of work in it already! I used the same bending blocks as I did for my trim tab, since the angles are pretty much identical.  I inserted the block and clamped it down to the bench.  I used a straight edge held against the block of wood to make sure I had it right on my bend line.

We bend the bottom tab first, and then fold the top tab over the top this way we form a lip that allows water to run over the skin, and not get trapped between the tabs, or worse, get inside the skin! Notice my note to myself (1 st!) so I don’t bend the wrong tab first.  I used a large block of wood and a small hammer with light taps to bend the bottom tab into position.  Once I had the bottom tab where I liked it, I did the same with the top tab, and the end results were decent.  While they are not perfect, and have a few tiny dents from the bending, I am happy with them as they are.  The dents wont be visible since they are on the inside of the edge and will have the trim tab butted up against them.

Next up, I  dimpled all the parts and skin.  I like to dimple after priming because it makes scuffing in preparation for priming so much easier.  I dimpled the skin, spar, end ribs and all associated parts for the left elevator.  I used a combination of my squeezer and the DRDT-2.  I had to use my squeezer on the skin this time, due to how tight the trailing edge is.  Once I had all my parts dimpled, I continued on with the rest of the plans.  In the section titled “Riveting the Left Elevator”, Van’s has us start out by riveting E-704 End Rib and E-703 counterbalance rib together.

After that, we move on to riveting the E-610PP and E611PP reinforcement plates to the E-702 spar, along with the E-00001A and E-00001B doublers and the rivnuts. We have to be very careful here, as there are three different rivet lengths that attach all these together. I used the squeezer to set all these rivets.

I was running a bit out of gas, so I decided to finish up the session by knocking one more simple little part:  The trim tab servo plate and brackets.  This is a simple part and only requires about 6 rivets.  I used the squeezer to set these flush rivets, and then test fitted the servo to make sure it was still all in alignment.  It came out great.

Thats all for tonight.  I still have a little bit more riveting to complete, so I will leave that for the next session.  I have also spoken with my local EAA Tech Counselor, and he’s going to come by this Saturday afternoon to give my project a look.  I still have the horizontal stabilizer, vertical stabilizer and elevators to close up, so I will leave them until he can inspect them before closing them up.  Here’s all the photos for tonight:

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Google Photos Link: https://goo.gl/photos/MEyHbRc28WovGerUA

Hours Worked: 3

Riveting the Right Elevator

Its time to rivet up a control surface! The right elevator is ready to be closed up and riveted.  I have decided that I am going to rivet the bottom side of the skins, and leave the top side clecod down for now.  This way, I can hold off on ProSealing the trailing edge stiffeners until I have the rudder, and both elevators ready for ProSeal.  This will save me from having to waste so much of this stuff, and I can get all the ProSeal work done in one session.

So, tonight I begin with riveting on the E-713 counterbalance skin to the E-701 skin. We do this because two of the rivets would be enclosed inside the skin once we insert the skeleton, and not be accessible.  So, we rivet those two rivets with the skeleton out of the skin at first.  I used my squeezer to set these rivets.

Once those two rivets are set, its time to shape the counterweight.  I filed down the sharp corners to match the contours of the E-713 skin, and also filed down around the edges so that it would fit in the skin easier. The we loose fit the E-714 counterweight into the skin, and then the skeleton assembly gets inserted into the skin.  Its a tight fit trying to wiggle it all together, especially around the counterweight.  Eventually I got the skeleton all situated into the skin and then I clecoed every hole to make sure it didn’t twist or shift.

Now its time to rivet! I thought it’d be best to start at the counterweight and work my way up the E-713 skin, and all the way down the tip of the end rib.  There’s a few different lengths of AN423AD3 rivets being used here due to the different overlapping skins, so I made sure to use the right one in each hole.  I had previously lapped the edge of the skins so that they would sit nice and flush after riveting, so I didn’t have to do that here.  Once I had the end rib riveted, I worked my way down the spar and finally to the E-702 end rib. I was able to use my squeezer on all these, so they came out perfect.

Having the bottom skin riveted on completely, I left the top skin just clecod for now.  I will come back to it later on, ProSeal the stiffeners and close it up. The last few steps on this elevator is to finish attaching the counterweight and torquing it.  I dug through my parts, got the bolts, washer and nut that the plans called for and used them on the counterweight.  Then I used my beam torque wrench to measure the drag on the nylon lock nut (which was 5 inch/lbs), and added that to the the 20-25 inch/lbs that the plans calls for as the torque spec on these type of bolts.  In total, I torqued them down to right at 30 inch/lbs total and then use some CrossCheck (Torque seal) to mark the nuts and screw heads as being torqued.  This CrossCheck also makes it easy to inspect the bolts to make sure they have not vibrated loose.  The paint will crack if the bolt or nut has turned.

Thats all for tonight! A little over 2 hours total, and the right elevator is 95% completed, and will go back on the shelf until I am ready to ProSeal everything.  Here’s all the photos I took tonight:

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Google Photos Link: https://goo.gl/photos/GRC1mBikUq2TWKsEA

Hours Worked: 2.25

Riveting the Right Elevator Skeleton

After taking short break from the priming session, I dug back into riveting together the right elevator skeleton.  This will give the primer on those doublers some time to dry. AKZO dries super quick, so by the time I get ready for them they should be ready for me 🙂   Per the plans, Vans has us start out by riveting together the E-703 and E-704 ribs which creates the counterbalance assembly  This goes easy enough with a squeezer and some AN470AD4-4 rivets.

Next up the plans has us rivet the E-709 end rib to the E-702 spar.  I had to take caution here, because we use AN426AD3-4 rivets, which need to be dimpled and sit flush on the front side of the spar so that the WD-605-1-R elevator horn will sit flush against the spar.  I was able to set these rivets with the flush set in my squeezer and they ended up nice and flush against the spar.

Then the plans has us rivet on the E-703/704 assembly to the E-702 spar.  This is where things got frustrating.  I was able to set the two rivets for the E-703 end rib with the squeezer. However, the two rivets for the E-704 were in a much tighter spot and I couldn’t get to then with the squeezer.  So, I drug out the rivet gun and bucking bar, but the straight 1/8 rivet set would not line up with the shop head of the rivet because of the gun body, so I had to use the offset 1/8 rivet set.  The first rivet I was able to set pretty well with the gun and bucking bar.  The second one?  Yeah, not so much.  I had to drill it out and try again.  Luckily, the second time went better than the first and I got the rivet set.

I then decided to skip back up to the doublers and platenuts on the E-702 spar.  These were fairly easy to do, I just double checked that I had the right length rivets in the right holes, as we use three different lengths in these sections.  I also double checked I had the orientation of the platenuts correct as well, and then used the squeezer to set al these rivets.  I love the way it came out!

Finally, I decided to rivet on the WD-605-1-R elevator horn to finish off the skeleton.  Again, double checking the orientation, because it is possible to put this part on upside down if you’re not careful.  Then, I riveted in using AN470AD4-4 rivets and my squeezer.

This finishes up the right elevator skeleton, and in the next session, I think I will rivet the skin to the elevator, but I am still debating on saving that portion until I get ready to pro-seal the rudder trailing edge.  This way I can use the same ProSeal to bond the trailing edges of the stiffeners of the elevators. We’ll see how it goes.  Here’s the photos from tonights session:

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Google Photos Album link: https://goo.gl/photos/Mu4Tk4GGtpf46Rmq9

Hours Worked: 3


Riveting the Left Elevator Stiffeners

More Stiffeners!! Tonight I think I should be done with stiffeners at least for a little while (wing kit maybe?).  I worked to rivet the last remaining stiffeners on the left elevator, and then moved on to attaching the E-615PP trim support plate.  First, I started off by working on dimpling and countersinking the E-615PP support plate to get it ready to rivet on the nut plates.  I found my #6 dimple die and I have decided to use NAS1097 3-3.5 rivets to hold the nut plates on.  I used my deburring bit and machine countersunk the E-615PP by hand.  This took a little time, but it guarantees a very nice finish.  I test fit each rivet in the holes to make sure they were nice and flush.

Then I dimpled the screw hole with a #6 dimple die to fit the dimple in the trim cover plate and its screw.  Once I had all the holes countersunk and dimpled, I began back riveting the nut plates onto the plate.  I decided to back rivet because this leaves a very nicely finished rivet and doesn’t take any extra work. I am really happy with how the nut plates turned out:

With the E-615PP completed, I moved on to the last of the stiffeners!  There isn’t much to talk about here, since I have done this several times in the past, and the process is the same.  I back rivet the stiffeners onto the skins and make sure everything is flush and straight.  The only difference is that this time, we are also going to back rivet the E-615PP support plate to the skin as well.  It serves as both a stiffener for the inboard end, as well as a doubler for the electric trim servo and its mounting plate.  I took my time, and everything came out looking really nicely.

This was about 2 hours of work, but I decided to take a break and then start working on my bending brake for the trailing edge of the elevators, and maybe bend one up.  Thats all for this session, here are all the photos from the build:

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Google Photos Link: https://goo.gl/photos/JTmj5mFvK3qrvBbr8

Hours Worked: 2

Riveting the Elevator Stiffeners

Stiffeners.  I swear this plane has more stiffeners in it than skin. Since I am holding off on bonding the trailing edge of the rudder for a few more days, I decided to move on to the elevators and start riveting the stiffeners on.  This will help get me to the point of bending their trailing edge and bonding the trailing edge stiffeners, which is what I am waiting on for the rudder.  This way I can mix up one batch of ProSeal and do them at the same time.  I already have my skins and stiffeners primed and ready, I just need to deburr and dimple them before riveting.

Thats where tonights work started.  I deburred the stiffener holes in the both the E-701 left and right skins.  Then I fired up the DRDT-2 dimpler and dimpled both skins, as well as all the stiffeners for both sides.  This went pretty quickly, since they were all AN4263-3.5 rivets. The dimples always turn out nice:

Next up was to back rivet all of the stiffeners to the skins, so i started on the right being that its the easiest.  Back riveting is one of my favorite ways to rivet, and I’d gamble probably most of the other builders out there as well! The rivets set so nice and perfect, and its pretty easy to do so long as you keep an eye on where your back rivet plate is.  I picked up a longer 16″ plate to have more room to work and its been awesome.  Here’s some quick shots of the end result on the right skin.

After I had the right skin all completed, I put it on the shelf and started on the left.  The left is slightly more complicated because it has the elevator trim system, so we have a few more pieces to work with.  I started out by marking where the E-615PP support plate went on the inside of the skin, and then deburred and dimple those holes on the skin and the plate.  This plate will get some nut plates around the inside opening, so I need to dimple the nut plate mounting holes and screw hole.  Here’s where I had a head-scratcher.  I have in my dimple die collection a 5/32 and a #6 dimple die….The plans call for a #6 screw to be used with the nut plate, so that means I need to use a #6 dimple die, but I cannot figure out which is the 5/32 and which is the #6!!! The markings are no longer on the side of my dies and they are VERY close in size.  I also took some time fitting the plate and pondering if I should dimple the AN4263-3.5 holes that the plans calls for, or if I should use some NAS1097 rivets and countersink them.  If I dimple, I will have to fiddle with dimple the nutplate ears, and that gets messy.  I am thinking about using some NAS1097, AKA “oops rivets”, instead.  They have a smaller countersink on the head, but since these are just holding the nut plate in place there isn’t much load on them.  Using NAS1097’s will let me machine countersink the plate and get a very close fitting rivet set and not have to worry about the nut plate ears.  I figured I would just call it a night here, and put some thought to this overnight and ask some folks on the Vans Airforce forums.  Maybe they can help me sort out which is a 5/32 and which is a #6 die as well! 🙂  Here’s the work I did get done one the E-615PP:

In the next session, I will back rivet on the stiffeners to the left skin, and figure out this E-615PP support plate conundrum, and probably make up the trailing edge bending jig.  Here’s the photos from tonights work:

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And heres the Google Photos link: https://goo.gl/photos/ZMa9huaebXyCxRGS7

Hours Worked: 3.25