Apologies for the title, I couldn’t help myself… Originally we’d planned to do another riveting session tonight, but Josie ended up working late, and we didn’t want to be making lots of loud noises at 10 PM. So instead I proposed that we work on installing the structural screws at the base of each gear tower.

But first there was a bit of a hang-up. All told, there are 17 screw holes per side; 15 of these call for AN515-8R10 screws, while the other two call for shorter -8R8 screws – the reasoning for the short ones seems to be that there are some other nuts inside the tower limiting the space for a protruding screw. Now, all this time I’ve been eyeballing a nice bin of flush screws that I presumed were the -8R10 screws, and figured those four short screws were in another bag that I know contains some assorted flush screws.

Noope – that bin full of screws was actually a pile of -8R8. Um, so where are the longer ones? I thought we’d broken out all the significantly-sized bags of hardware while inventorying, but apparently not in this case. Eventually, after digging through the fuselage inventory sheet, I found the bag they came in…still full of screws, along with the 8-32 lock nuts. The discovery of the nuts is a bit amusing too – I took a look a few days ago at my bin of these guys and realized I didn’t have enough for all these spots, so I ordered some more from Spruce along with some other stuff earlier this week. So yeah, now I’ve got enough 8-32 lock nuts to last a loooong time.

Anyway, we finally got to work. Getting these done was a bit tedious – only a few screws on each side are outside the gear towers where the nuts can be tightened pretty easily. Several required me to just hold the nut while Josie snugged the screw in place, with me just torquing from inside. The rest were inside the gear tower, and even with my nice access-panel modification, they were tough to get to.

So we got all the longer screws installed, and made a passing attempt at the short ones, but after a couple failed attempts to even get the nut started from inside the fuselage, I called for a recess for the evening. I think it might actually work better for these screws if the fuselage is sideways on the rotisserie – at least then gravity can help holds the nuts in place. Or maybe we’ll give it another try tomorrow, we’ll see how it goes.

Still, most of them are done…now to get back to riveting, maybe tomorrow night.

Oh boy, what fun. Today has been super slow going – we started out trying to finish up the forward gear crossmember. Yesterday we did all the rivets in that except for four in the center that attach two nutplates, which in turn are part of the rudder pedal mount system. Those went pretty easy, so we then went to work on the inboard edges of the lower forward skins. Like with the nutplates, these were flush rivets with the flush side inside the cabin, which meant I was sitting inside shooting while Josie was bucking.

Now, the thing people will tell you about shooting solid rivets is that handling the gun is the easy part – mostly all you have to do is hold the thing straight and have the right sense and trigger control to hit rivets for the proper length of time. Bucking, on the other hand, is a bit more of an art. You’ve got to hold the bar so the face on the rivet tail is parallel to the surface, and you’ve got to keep it in that orientation while a high-speed air hammer is beating the crap out of the other side. Getting this right means finding a middle ground between holding the thing with a death grip and letting it use bounce everywhere. Sort of a .38 Special “Hold On Loosely” thing.

Anyway, that’s a long intro for this tedious bit of work. These were only maybe 18 or 20 rivets, but there was a lot of me shooting, then climbing out to examine a shop head, then coaching Josie a bit more on the bucking, and so on. The end results were not the best set of shop heads ever, but none of them were horrible enough to drill out. This is especially true because where these were located, drilling any out without damaging the holes would have been a whole new challenge. Sometimes there’s a real judgment call to be made between a subpar rivet shop head and the potential for damage if you drill it out to replace it.

Side note: lest anyone thing I’m making excuses for poor workmanship, this exact dilemma is called out in the shop manual. In particular, re-shooting after drilling out can often lead to a worse rivet than the first – the hole has likely been enlarged a bit, there’s a bit more slop, and thus more opportunity to cause trouble.

Anyway, after getting through that slog, Josie went for a rest while I got the cooling ramp clecoed in place for later riveting. Some of the attach rivets for this are blind rivets, so I went ahead and got those set. Then I spent some time cleaning the shop before we took the dogs for a pre-sunset walk. We decided to do another riveting session before dinner, and this time we went for the row of rivets on the forward side of the spar carry through. These went mostly well, though I folded over a couple rivets bucking from inside – there are a couple spots with bolt heads on the bulkhead here, and working around those to get the bucking bar in place was really tough, especially considering I had very little freedom of movement.

The real fun came with the outboardmost rivets on this row – the aft end of the lower longeron is in the way, so there’s no way to use a full-size bucking bar. Instead I had to use the small edge of one of my thin tungsten bars. Doing this requires very precise control of the bar, and is pretty error-prone. Even better, I had to get into a different position for this, squeezing my upper body in between the saw horse and the aft upper brace (at the top of the gear towers). This led to yet another “action” shot, this time with Josie just sticking her phone under the cockpit and trying to capture my contortionist adventures:

What’s not so obvious from that picture is that my legs are sort of sticking off to the left side. I felt quite a bit like a pretzel. But hey, i got both of the tough rivets bucked with no issues, which let me breath a sigh of relief.

That was where we called it a night. I took a few minutes to drill out the four bad rivets out of that row – we’ll pick back up with those another night. We’re talking about trying to do consistent short evening session this week to finish this stuff up. At first I was a bit frustrated at the rate of progress, but I have to remember that Josie’s not nearly as experienced at this as I am – she’s going to go slower and get a good bit more mentally taxed than I do. As with everything homebuilt, slow and steady wins the race.

So riveting last weekend didn’t happen – Josie wasn’t feeling well on Sunday. And while that kept me from really working during the week, as the riveting is kind of my blocking thing right now, it wasn’t a total loss. You see, Friday I got a nice big box from Cleaveland Tool that contained my seats. I ordered these late last year, and after a fair amount of thought, went with leather seats, but kept the look fairly simple – just plain gray with some orange topstitching. This will match up with my expected exterior paint design, but without being too garish (or requiring that I match, say, orange leather with an exterior color I’m not yet sure about).

Of course, I had to temporarily put the floors in and cram in the seats for some photos. And yes, I climbed in and did a test sit, both in front and back.

Anyway, that takes us forward to today. Well, I guess sorta last night, because I spent some time just really getting things organized for the riveting work. Flipped the fuselage, got it on the sawhorse, pulled over a table, put the rivets/gun/bucking bars/etc on it…I mean really getting those ducks in a row. And so this afternoon we went to work.

First up were the antenna doublers that I fabbed up a while back. I figured these would be a good easy intro since Josie hasn’t done any riveting in some time. These were going fairly well until we got to the com antenna doublers, which are located right behind the spar carry-through. We’d just shot the first rivet when I really looked at what we were doing, and realized I made a dumb choice when I made these.

Notice those four holes in the pic below? Those are for the wing attach bolts. And the forward flange on that doubler is right in the way of them. Not necessarily a problem if I insert the bolts from forward, but even then they might be annoying for getting the nuts in place. I’m glad I noticed this now, that would have been a really unpleasant surprise when it came time to hang the wings.

Easy fix though – there’s no real need for that forward flange, seeing as how it’s right beside probably one of the sturdiest areas of the aircraft. So we just paused riveting for a bit, and I removed the doublers and just removed those forward flanges. Easy peasy:

Sometime around when we were finishing up those doublers, Josie decided to get a rare action shot of me doing my thing. Well, maybe not an action shot, just me demonstrating the glamor involved in homebuilding…by which I mean slithering out from under the inverted fuselage:

After that, we had time to get the forward landing gear crossmember riveted to the forward floor before it was time to duck inside for some dinner. That was the end of the the day’s riveting, but it allowed me to go ahead and get the bottom forward skins installed, which I did after dinner. Just got to put a sealant bead on the firewall flanges and then get these guys clecoed in place. I also went ahead and installed all the rivets that didn’t require two people. So now I’ve got most of the components at least in place:

Only thing still missing here is the cooling ramp, which will have to wait until we do a lot more riveting. From here, we’ve got a bunch of rivets along the bottom edge of the side skin (in assembly with the lower longeron and the bottom skins), another line along the forward side of the carry-through, and then the remaining ones on the forward bottom skins. Oh, and there are also a bunch of flush screws to install at the base of the gear towers, which we might as well do as a team.

The only real hangup here is a couple of rivet holes along the lower longeron – there were two spots here where the parts didn’t quite line up properly, and I ended up drilling the holes out for 5/32” rivets. Only problem is, while I have an assortment of those on hand, I don’t have the length needed for this stackup of materials. I thought about doing #8 structural screws instead – because they’re the same size and I have them – but once again, the ones I have aren’t the right length. I figure if I’m going to order fasteners I’m just going to get the rivets I need to go here.

Well folks, it’s almost time to go back and do this fuselage riveting that I’ve been putting off for so long. Today I wanted to go review the construction manual and get familiar with what needs to be done, with the idea being that when Josie is able to help me tomorrow, we can focus on shooting rivets instead of me having to spend a bunch of time staring at plans and stuff while scratching my chin.

This actually took a decent bit of time, just by virtue of me triple-checking everything. In particular, I couldn’t figure out for the life of me why we hadn’t already riveted the row along the forward side of the center section. I even went back and read through all my old build log posts about the fuselage riveting, and that led me to the amusingly obvious answer – whereas the rivets on the aft side of the center section only go through the belly skins, the forward row also rivets in assembly with the forward bottom skin – which is exactly one of the components we’ll be riveting tomorrow.

Anyway, basically what we’ve got for tomorrow is to shoot a few rivets on the side skins, that row along the center section, and then the forward landing gear crossmember. Then we get to install the forward left and right side skins, shoot a few rivets in each one of those, and add the cooling ramp. There are also a bunch of fish screws at the base of the gear towers that I’ll probably recruit her help with.

The other thing I’d like to get done tomorrow will be riveting all the antenna doublers. I still needed to get the rivet holes in the lower skin dimples for this, and doing this meant getting out the old pop rivet dimpler. It’s not my favorite tool at all, but it gets the job done when nothing else will. I ended up recruiting Josie to help with this too, since it’s a lot easier with someone on both sides of the skin.

So I think we should be set for an afternoon of riveting tomorrow. Hopefully we can get it all done tomorrow, but if not I think we can maybe bleed into some weekday evening sessions as well. And then I guess I won’t have any excuses left for not getting busy on the main wiring harnesses…