Ribs | Andrew's RV-7 Build Log

VS Skin Riveting, Part Deux

February 12, 2010

I’m writing this on Monday for Friday night’s work, so we’ll see how much I can remember.

After a couple minutes of clecoing on the right side of the VS skin, I got started riveting. First, I set every other rivet along the VS-702 front spar and the VS-707 middle rib.

Left skin on the bottom, right skin on the top. That crazy long cleco keeps sneaking into the pictures.

After rivting the front spar and ribs to the skin, here’s an interior picture.

Lower interior of the vertical stabilizer.

Here’s a picture of my “every-other-rivet” style. It works well.

Ready for the remaining rivets.

There are 39 rivets (not counting the tip and root ribs) for the front spar and middle ribs. After setting these 39, I’m ready to pull off the blue vinyl from the interior.

Starting to look pretty. So is your face.

Another rivet picture. (I’m not sure I got these in the correct order…Hmm.)

VS shop heads.

More rivets.

More shop heads.

<sigh>

<yawn>

Had enough yet?

Even more shop heads.

Alright, now I get to start removing the blue vinyl. This is where the gravy is. After all that prep work and riveting, you get to remove the vinyl to reveal a beautiful shine on the inside. I can’t wait to do this on the exterior skin (just before polishing). Flash on for visibility.

Starting to remove the blue vinyl.

I left the flash on for this one so you could see inside.

Inside the lower bay of the VS.

And the upper bay.

Upper bay of the VS.

After removing all of the vinyl, I moved on to riveting the tip (VS-706) and root ribs (VS-704 and VS-705) to the skin. All was going well, until I got the front of the root rib.

Anyway, for some reason the skin wasn’t sitting well on the rib. I later determined it wasn’t interference, just the natural curve of the rib.

The lower right side of the VS skin wasn't sitting very well on the root rib.

My solution? Use a tape-covered clamp to squeeze them together.

Alright, let's set this rivet.

That did the trick. Who’s next?

Looks perfect now.

Here I am riveting some of the rest of the root rib. I was very careful to not rivet the 6 holes on each side the instructions tell you to leave open for the empennage fairing. I probably won’t use all 6, but I can always squeeze these later, so why close any metaphorical doors?

In the middle of squeezing the root rib.

Here’s the VS (except the rear spar) all riveted together. Notice the 6 clecos in the holes to leave open.

Where's that rear spar?

I inserted the rear spar and started setting rivets. All was going perfectly, until I realized that most of the rivets couldn’t be set because of conflicting shop heads on the rear spar. I had tried two rivets that were close to having enough clearance, and I messed both of the shop heads up. Here’s one.

Bad rivet shop head there in the middle. Obviously.

And here’s the other.

Another bad shop head there on the left. See the cleco in the middle of the picture. The rivet that will go in that hole doesn't have a lot of room to be bucked.

I gave up on any other rivets that would be close with the squeezer. I’ve been doing so well recently with the gun and bucking bar, that I’ll just wait till I can make loud noises and set them with the gun.

Where I left off for today. I'll figure out how to set the remaining rear spar to skin rivets sometime next week.

One and a half hours today. 135 rivets set; some shot, some squeezed. Only a few will have to be drilled out later. Good night tonight. Hopefully next week, the dogs will get some directional stability.

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Posted by Andrew

Skin Dimpling, Edge Finishing, Priming, Riveting

January 30, 2010

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I worked in sections today.

There was a big storm here last night, (and all of today), but I’ve learned that cleaning off the driveway is a lot easier if you do it when it is 3″ two times instead of once after 6″ has accumulated. Here’s what I woke up to this morning.

Snow!

Here’s after about an hour of shoveling. Good workout.

Coming down fast, but at least I cleared off the first 6".

Then, I got the c-frame out and finished the VS skin dimpling. I replaced the blue tape on the male die, and got almost no circles.

Simple but effective dimpling setup.

Then I countersunk all of the lower forward spar reinforcement holes from the plans. I haven’t used the countersink since I had to countersink HS-710 and HS-714 to accept a #30 dimple, so the countersink cage was already set up. All I had to do was verify in a piece of scrap. Yup. It’s perfect.

Beautiful countersinking.

Then, I cleaned and primed one interior side of the vertical skin, then the other. Here’s the first side drying.

Hurry up and wait to dry.

After finishing the second side and letting it dry, I pulled the forward section of vinyl off of the interior side of the skin. During assembly, no bucking bars will be needed in there, so there is no risk of scratching. Then I finished edge finishing the ribs, spars, and rear spar reinforcement, and primed each one. I didn’t prime them sitting perfectly horizontal, so I got some runs and some nastiness; some of them ended up getting touched up, and some got a second coat. After they were all dry, I cleco those bad boys together in preparation for riveting.

Skeleton and rear spar taking shape.

I started with the skeleton, middle rib. Here’s my first VS rivet.

First VS rivet.

Then, I moved to the tip. See the upper rivet? The skins are sitting flush, this will have to be drilled out.

Ahhh! I suck at riveting.

And the lower rivet there started to bend over. I’ll have to drill out both rivets.

Two rivets to be drilled out.

Back to the middle rib, two more perfect rivets.

There are pretty good. I need to make sure that bottom one is driven enough.

See the fourth rivet from the right? Started to bend over, so I’m going to drill it out. Also, I’m going to put the shop heads on the thicker material here, also, they’ll be easier to inspect.

Uh oh. See the third rivet from the right? I was supposed to wait and rivet this with the skeleton. Slow down and follow the directions!

Two more rivets to be drilled out.

But I was feeling good about squeezing, so I kept going. Until these 4 rivets. Terrible…they all started to bend over. I think my rivet squeezer sucks. I have to squeeze really hard and it it tough to keep everything aligned. I think after I drill these out I am going to shoot and buck these.

4 bad rivets to be drilled out.

At this point, I had to walk away, I was tired, frustrated, and not making any progress. Ugh.

So far, 3.5 hours. I set some rivets today, but I’m not going to count any of them until I drill them out. I’ll update the rivet count later.

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Leave a Comment » | Empennage | Tagged: C-frame, Dimpling, Front spar, Priming, Rear spar, Ribs, Riveting, Scotchbrite, scuff, skeleton, skin, spar, Vinyl | Permalink
Posted by Andrew

More VS work

January 26, 2010

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Last night I spent a little bit of time rearrange (cleaning) out the workshop. Now, I’ve got a little more room to maneuver. (Mostly, I just moved my second workbench a little left, and moved the shop vac over by the compressor, now the walkway to get into my workshop area is a little more open.)

Slightly different layout for the workshop. I like this.

Tonight, I started by disassembling the vertical to start the deburring, dimpling, countersinking, cleaning, priming, and then reassembly dance. Here I am set up in front of the UNC game for some deburring.

Ready to deburr some holes. Don't judge me for drinking white. We had red snapper for dinner.

After what seemed like a thousand holes to deburr, I broke out the 3/32″ tank dimple dies and the 1/8″ regular dimple dies (for the rear spar) and got ready to dimple. Dimpling is much easier than deburring, and fun, too. I know deburring is important, but I feel like I’ve made progress after dimpling.

Ready to dimple.

Then, I started dimpling the ribs and spars. Here are the 3/32″ tank dies in action.

3/32" tank dies in action.

Here I am using the 1/8″ regular (shallower) dimple dies on the rear spar. I had to triple check both the holes and the direction before proceeding. This is correct, I think. (Flush rivets on the forward side of the spar.)

1/8" dimples on the rear spar. These are my first 1/8" dimples.

After finishing dimpling, I grabbed the skin and brought it inside to devinyl. Devinyling is a lot easier indoors, where the vinyl is room temperature. I tried pulling off the horizontal stabilizer vinyl in the garage when it was near freezing, and it kept tearing and was very stiff.

Waiting for the soldering iron to heat up.

After using the soldering iron and a wooden straight edge (the metal straight edge carries heat away too quickly, and you don’t get a melt line), I got to pull off the vinyl. For some odd reason, I find devinyling very cathartic. I love pulling off the blue to see the shiny aluminum underneath.

Pulling off the vinyl on the inside of the skin.

Ready to pull off the blue vinyl on the exterior of the skin.

Ready to devinyl the outside of the skin.

And finally, the vertical stabilizer skin devinyled (and everything carried back out into the garage).

Pretty skin. Also, that's me in the reflection.

Here are the ribs and spars all deburred and dimpled. (I still have to countersink the front side of the VS-803PP.)

Ribs and spars deburred and dimpled.

Next up, countersinking the rear spar reinforcement then deburring, dimpling, and scuffing the skin. Then priming, then I get to put this sucker together.

I can’t believe how much faster the vertical is than the horizontal. Part of it is the learning curve, but I think they should have you start with the vertical. Much easier, in my opinion.

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Posted by Andrew

VS Assembly and Matchdrilling

January 24, 2010

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First thing after breakfast, I snagged the two VS spars and the spar reinforcement and headed into the kitchen to finish some surface prep. After about an hour, I had all three pieces scuffed up, cleaned, and back outside. Here is a shot during scuffing. You can see the top half has been scotchbrited and the bottom half is the raw part after removing the blue vinyl.

You can even see my hand and the camera in the bottom half.

Here’s the spar reinforcement before finishing.

Rear spar reinforcement.

All three after scuffing. (Along with the ribs from last night.)

Looking good.

Then, I bent the rib flanges to exactly 90 degrees using my new hand seamers, and fluted the ribs.

Fluted, ready for assembly.

I started clecoing the rear spar doubler to the rear spar, and then realized they want you to put the hinge brackets in now. I quickly located VS-410PP, VS-411PP, and VS-412PP, and got the Goo Gone out to help pull these stickers off.

These part number stickers are a pain in the butt to get off cleanly.

While I waited for the Goo Gone to do its magic, I decided to start clecoing the front spar and ribs together. You can also see the rear spar and rear spar reinforcement in the upper left corner of this picture.

Tip rib attached.

Then, I clecoed in the rear spar. Here, you can also see the hinge brackets waiting for the Goo Gone.

Middle rib attached.

Finally, I clecoed in the root ribs (fore and aft).

Root ribs attached.

Then, I cleaned off the hinge brackets, got them clecoed to the rear spar, and clecoed the rear spar to the front spar and ribs.

Looks like an airplane again.

I followed Mike Bullock’s advice and clamped the rear spar to a couple of 2x4s. This let me matchdrill the rear spar vertically, which helps a lot with getting a perfectly straight hole.

Rudimentary VS jig for matcdrilling the rear spar.

Here’s my process. Cleco every other hole, match drill, mark the drilled hole with a dry-erase dot, move the clecos, repeat. Here, you can see my dots.

Dry-erase dots help me know which holes I've drilled.

After finishing up the ones you can reach from the aft side of the rear spar, I flipped the whole assembly over and match-drilled the two remaining holes (that aren’t drilled in the upper half of the lower set of hinge brackets).

12" bit doing its thing...

Next, we get to cleco on the skin, wuhoo!

It looks like another airplane part.

Then, time to matchdrill the skin to the spars and ribs. Same process here. Cleco every other hole, drill, mark dots, move clecos, repeat.

Match-drilling the skin.

Here, you can see that I am in the middle of moving clecos. The one in the center of the picture gets moved one left (into the marked, already drilled hole), then the one to the left of that gets moved one left, and so on.

Example of brand new cleco on the left, and two used clecos in the middle. Eh, they work just fine, they're just not as pretty.

I got the left side of the vertical match-drilled, then flipped it over, took this picture, and then headed inside.

Ready for the second side of match-drilling. Maybe later tonight or tomorrow.

3.0 solid hours today. Good work all around.

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Posted by Andrew

Started closing up HS

January 20, 2010

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I snuck out to the garage tonight for a couple minutes of getting the rear spar riveted into the HS. Before clecoing the rear spar in, I had a few rivets I needed to drill out from yesterday. First, this one, which was sitting a little high.

Down in front!

Easily drilled out and replaced. Then I moved on to two cases of split shop heads. Here’s the first one.

Split shop head #1.

And the second one. I think this happens when I start to set the rivet a little crooked and then try to straighten out.

Split shop head #2. Uglier.

Anyway, I fixed both of those, and took this picture of the new shop head as representative of all three.

It's art to me.

Then, I clecoed the rear spar into the HS and started dropping rivets in. These haven’t been squeezed yet, but I thought it looked cool.

Ready to start squeezing the skin to spar rivets.

Then Ginger came out to ask why I wasn’t inside rubbing her belly.

"What are you doing out here, dad?"

She wouldn’t come on this side of the workbench, but was definitely curious. She was staring at me from under the workbench for about 20 seconds before I realized she was down there.

"Dad, come inside and let me lay on you."

After squeezing all of the skin-to-spar rivets, I needed to find the BSPQ-5-4 blind rivets. Here they are.

BSPQ-5-4.

Here are the HS-708 (rib) to rear spar holes they fill.

Last 2 (4, 2 on each side) holes in the horizontal stabilizer.

Done.

I don't love having these blind rivets showing, but no one will see them when the elevator is installed.

Here’s a picture of the almost final project. I circled about 7 rivets on the bottom side (the HS is upside down here) that I want to replace. I’ll fix those this weekend, and inspect the top side before calling the HS complete.

Almost done. Looking good.

I ended up spending almost 2 hours outside. Drilled 3 rivets out, set 178.

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1 Comment | Empennage | Tagged: Empennage, Ginger, HS, Rear spar, Ribs, Riveting, skin, spar, Squeeze | Permalink
Posted by Andrew

More Right HS Riveting

January 17, 2010

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After a nice day off (had to work), I got back in the garage this morning for some good progress.

I started off by assessing the damage from the other day’s skin denting fiasco. I contemplated removing HS-707 entirely (from the top skin, too) so I could really get in there and smooth this sucker out. I even got everything mocked up in the c-frame again to look at the feasibility of getting rid of this dent. Then I decided I would have probably caused more harm than good, and that it looked a lot better today than it did the other day. After re-clecoing HS-708 into the skin with HS-707 and re-riveting the bottom skin to HS-707, I took this picture. The dented area is between the bottom two rivets in the picture. It’s really not that bad.

The denting between the bottom two rivets is really not that bad. And, it's on the bottom of the right HS. No one will look there. Unless you are reading this, and come to see my airplane, and want to see the dent on the bottom of the right HS. Damn you.

Anyway, with that done and behind me, I clecoed in the front spar assembly from Friday.

Upside-down HS assembly after starting to cleco the front spar (already riveted to the left HS skin) into the right HS skin.

CRAP! I forgot to remove the blue vinyl from the inboard bay before clecoing everything together. Okay, let’s un-cleco, remove, the vinyl, and recleco. Great. After inspecting (admiring, really) the assembly, I noticed a loose rivet (as opposed to a prude rivet. Hehe.). It was one of the two forward HS-707 rivets (by the denting). Grrr. Okay, should I un-cleco everything, and risk scratching everything in the process, or drill out two small rivets in the HS-404 to get my arm in there. I decided to go with drilling, since apparently I am really good at drilling rivets out. Without any issue, I got HS-404 removed and reached in to replace the offending rivet (second from the right in the picture).

HS-404 removed so I could reach in to replace the loose rivet.

Then, I reinstalled HS-404. (But took this picture before I actually riveted it to HS-702 (front spar) and HS-405 (aft root rib) behind the spar. Just pretend there are perfectly driven rivets there.

HS-404 reinstalled and the rest of the skin clecoed together.

Time to skin rivet. I like this part. Here is my technique. I stick the appropriate sized rivet in the hole, cover with blue tape, then reach in with the bucking bar, and shoot with my flush set, which is also covered in blue tape. Then, I remove the rest of the clecos, put rivets in again, and move all this little pieces of blue tape over one. (Then I figured out that on the second round, I could remove all the blue pieces of tape and run a whole line of tape along the line. I just had to make sure verify which rivets I had the bucking bar behind by pushing up on it a little. you can then see the rivet pushing up behind the tape. Bucking bar in place, I can set the gun down on the rivet and shoot.)

If you were counting, you noticed there are now two pieces of blue tape between the flush set and the rivet (and my fragile HS skin). This worked well for me, prevented further damage, and gave me some friction to help keep the set in place.

Rivets ready to set, covered with blue tape.

So, I knocked out all of the rivets needing to be bucked (I think it was 42 per side) before inspecting all my work for any issues. I think I found 5 skin rivets I wanted to replace. Here is a good example. The shop heads of all of these look great, but I want those rivets perfectly flush. I didn’t take an after picture (sorry), but I assure you, the one on the right now looks like the one on the left.

Bad rivet on the right. Replace.

After bucking all of those, I moved the now very big HS assembly to the floor while I cleaned off my workbench. Nice and clean again.

Clean workbench!

Then, I brought the HS back up on the table to squeeze the rivets that could be squeezed on the HS-601PP (skin) to HS-404 (inboard tip rib), HS-405 (inboard aft rib), and HS-706 (tip rib). The instructions have you leave 5 holes open on the inboard lines for the empennage fairing attach holes on the top only, but I decided to leave the same holes empty on the bottom for now, just to have clecos there on both sides to hold the HS off the table. I also left some clecos in both sides of the tip ribs (although I left less on the right than I had on the left the other day, so I squeezed a few more on the left. ) Anyway, the HS is upside-down here. Left side is in the foreground.

Oooh, pretty.

Another shot. Still need to get that rear spar done. Look in upper right side of the picture. The dented area (I really shouldn’t call it dented anymore) is in the middle of the leading edge there. (I know the picture is from a distance, but the point is it’s not that noticeable.)

More pretty!

And after I flipped the HS right side up.

Shiny and clean.

After a hard day’s work, I stood back and admired the almost finished product.

I need a bigger workbench.

Good 3.5 hour day today. 146 rivets set, 14 drilled out.

Next up:

1) Remove rest of blue vinyl from inside of HS.
2) Rear spar work.
3) Finish riveting holes in HS.
4) Figure out what is going to “fly” when I finish the HS.
5) Hang HS for storage

I also decided that I am going to keep a separate page for tips. I keep learning these little tricks along the way. I should write them down.

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1 Comment | Empennage | Tagged: C-frame, cleco, Devinyl, Empennage, Front spar, HS, Rear spar, Ribs, Riveting, skeleton, skin, spar, Squeeze, Vinyl | Permalink
Posted by Andrew

Started riveting right HS

January 15, 2010

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I managed a couple hours in the shop today, even though I was as sick as a dog. In between frantically running to the bathroom to pray to the porcelain god, I did get a couple things done. I planned to get some of the right HS done today, which needed more prep on the skin, and then some riveting.

First, I cleaned and primed right HS skin interior.

Right HS skin all primed and such. Well, on one side, at least.

After flipping, priming the other side, and letting it dry, I decided to fix some of the bad rivets from the other day. They look better now.

HS-710/HS-712 to HS-702 rivets fixed.

Then, I grabbed the right HS ribs and front spar and clecoed some of them to the left HS. I

Right spar clecoed to the left HS assembly. This thing is getting big.

I started by riveting the front spar to HS-710 and HS-714. This time, I was following the directions a little more closely. All of the rivets today turned out great. I had switched from my offset cupped set to a straight set, and they were all perfect. (Don’t mind the two empty holes on the far left, I remembered them later and shot those rivets, too.)

Great rivets if I do say so myself.

Then I riveted HS-405 and HS-404 to front spar. Again, no mistakes. Then, I turned back to the skin once it was dry. On the left side, I waiting until riveting HS-707 and HS-706 to the skin before I devinyled this area. On this skin, I figured that I wouldn’t be holding a bucking bar (that I could drop and scratch the skin) in this area, so why not take the blue off before making it hard on myself. Much easier this way, but I could only do it here. (I have to admit, those nice straight primer lines make me happy.)

Back to the skin. Devinyling the easy way.

The directions have you cleco in HS-707, rivet to the bottom skin, then cleco in HS-706 and HS-708 (to help the skin take shape and sit tight against the aft holes of HS-707), and then rivet HS-707 to the top skin. Just like the left side, I needed AN426AD3-4 rivets where they sometimes call out an AN426AD3-3.5.

The, I let this happen.

Uh oh...

What? Don’t see anything? Try this angle.

AAAAAAAHHHHHHHHHHHHHH!

NO!!!!!!!!!!!!!!!!!

:-(

It was completely my fault. I was getting confident, and was holding the rivet gun with my left hand. I had the pressure set near 50psi (I usually use 40psi for the AD3- rivets) and the gun got away from me.

I stared at it for about 5 minutes, realizing that it was probably okay, but would essentially force me to bondo and paint the tail, which would not have been the end of the world, except I still might want to polish the airplane.

I decided to drill out the 4 rivets I had set in the bottom skin to see if I could help it any with a flush set from the back side. I managed to get my backrivet set in there a little, and it helped, but I came inside as I was getting chilled and frustrated.

Later, I realized that I have a c-frame, and with two flush sets in there, I may be able to very gently hammer it back into shape (or at least get it close). I’ll have to re-dimple, too, because I flattened out the dimple while trying to fix the dents.)

…so…mad…

Maybe this weekend I can fix it up a little and keep going.

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1 Comment | Empennage | Tagged: Devinyl, Empennage, Front spar, Priming, Ribs, Riveting, skeleton, skin, spar, Squeeze | Permalink
Posted by Andrew

Right HS – Primed skeleton, Dimpled skin

January 14, 2010

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Today, I used my lunch hour to swing by NAPA to pick up some more self-etching primer and then get a few minutes of work done before playing with the puppies. Jack and Ginger love it when they get to go outside and play during the middle of the day.

Anyway, I finished edge-prepping, cleaning, and drying the right HS ribs and front spar before priming them.

Then, I broke out the c-frame and finished dimpling the right HS skin. This time, I put a piece of blue painter’s tape (sticky side toward the male (exterior side of the skin) dimple die) between the dies and squeezed them together. I figured this layer of tape would help prevent some of the circles I am getting during dimpling.

3/32" Dimple Dies covered in blue tape.

The resulting dimples don’t have as much of a circle around them, and the dimples are just as deep. I wish I had known that the first time around. I’m not very happy that my right HS is going to end up looking a lot nicer than the left.

It was a little short of an hour today, but I ran a little long yesterday, so I’ll log an hour.

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Leave a Comment » | Empennage | Tagged: C-frame, Dimpling, Empennage, Front spar, Ginger, HS, Jack, NAPA, Priming, Ribs, Scotchbrite, skeleton, skin, spar, Squeeze | Permalink
Posted by Andrew

Squeezed more left HS Rivets

January 11, 2010

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I got some rivets squeezed tonight, which means it was a good day. All of the rivets tonight were either HS-601PP (skin) to HS-706 (tip rib) or HS-601PP (skin) to HS-404/405 (inboard ribs). All squeezable.

The plans have you skip 5 rivets on the top only, but the clecos were doing such a good job of holding the skin off of the table, I decided to skip those rivets on the bottom, too. Also, I only squeezed every other rivet on the tip until I can get the rear spar riveted in. Then, I’ll finish the whole thing off.

On the top of the skin, Van's has you leave the rearmost HS-405 hole open, then every fourth rivet forward of that. Here are my first three squeezed AN426AD3- rivets on the project.

Then I got up to the HS-601PP (skin) to HS-702 (front spar) to HS-405 (aft inboard rib) hole. You can see that the longer rivet they call out (AN426AD3-4, instead of -3.5) isn’t long enough.

Bad picture, but the rivet at the top of the picture is not going to be long enough to form a good shop head.

So, I replaced it with an AN426AD3-4.5.

An unsqueezed AN426AD3-4.5. That looks like it will be long enough. It was.

Then, I spent a few minutes looking over my work from yesterday. It generally looks pretty good, but I must have been distracted during these three or four rivets (at least they are on the bottom of the skin). Not a big deal, but when you look at it in the right light, you can see some small dings.

A couple small smilies and dings. These make me want a swivel flush set. Hmm. It looks like I didn't keep the rivet gun straight. Bummer.

From today, two of the rivets I squeezed didn’t sit correctly in the dimple. They are probably just fine, but I’m going to replace them. (I know, I know, they will be under the empennage fairing, but still, I want them better than they are.)

Only two rivets to replace tomorrow. Better than yesterday's average.

30 quiet minutes today, after the girlfriend and puppies went to bed. I’m so sneaky.

38 rivets tonight, 2 I’ll have to drill out tomorrow, but don’t count against my batting average tonight.

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Leave a Comment » | Empennage | Tagged: Dimpling, Empennage, Front spar, Ginger, HS, Jack, Rear spar, Ribs, Riveting, skeleton, skin, spar, Squeeze | Permalink
Posted by Andrew

Left HS Riveting

January 10, 2010

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Today I started left HS skin riveting.

The big takeaway is that I hate squeezing AN470AD4- rivets. For some reason (it’s gotta be user error), I keep bending them over. Finally, I broke out the gun and got some rivets set. I think I may need a better bucking bar. The fact I set some really nice rivets with the crappy bar means that a tungsten bucking bar will probably be my favorite tool. Anyway, first picture is me riveting HS-710 and HS-714 to the left HS-702 front spar. You can see the two rivets in the upper right side of the picture needed to be drilled out. Oh wait. They all needed to be drilled out. See how I put the manufactured side on the thicker material here? Wrong, drill them out. That’s one of the reasons I drilled out 11 rivets today. I didn’t get all of these reset, but I did get the ones that would be inaccessible once I started riveting on the skin. In the picture below, I set the six behind the HS-404 rib, and six of the ten in front (lower right) of the HS-404 rib. A few of those bent over again, so I called it quits on this part and moved on. I’ll have to drill out more rivets tomorrow. Ugh.

Squeezed, and then drilled out HS-710 and HS-714.

Next, I started some skin riveting, with the HS-707. You can see my first two skin riveting shop heads.

My first two flush rivets (well, first two on the skin).

Then I shot two more and took this picture. Sorry about the fingerprint smudges. Rest assured, the skin is nice and smooth.

First 4 flush rivets on the left HS. They look so good.

Finished up the top, and then riveted the bottom (except for the last bottom skin rivet, the bottom 1/8″ cleco prevented the bucking bar from getting in there, so I’ll set this after I remove HS-708). The second and third rivets on the bottom need to be replaced. They are probably okay for such a non-structural area, but I am a perfectionist.

After riveting the top and bottom skins (to HS-707). Except the most aft skin rivet on HS-707. (See the lower 2nd and 3rd rivet from the right? Those shop heads are too small. I'll need to replace those.)

Drilled them out, and replaced them. They look much better now.

Replaced with AD3-4 instead of AD3-3.5. I don't know why these needed longer rivets when every other rivet looked okay.

Next, I finished riveting HS-710 and HS-714 (front spar reinforcement angles) to HS-702 (front spar). Shop heads on the thicker material.

HS-710 and HS-714 successfully riveted to the front spar.

Here’s a closeup of the two replaced rivets.

Another closeup of the HS-707 rivets.

Next, they have you cleco in the front spar and cleco HS-708 (what I am calling the middle aft rib) into place. (Ha, the Yard gave me a long reach 3/32″ cleco in my bag of used clecos. You can see it on the upper left.)

Clecoed the front spar and HS-708 in place, ready to blind rivet.

One of the LP4-3 blind rivets set. I had to grind down my cheapo National Tool and Equipment blind rivet puller. Not hard, took about 5 minutes, and ended up working really nicely in here.

First blind rivet on the project. (I think it's an LP4-3.)

And all three complete.

All three blind riveted. Time to move on.

Here, I got a shot of my painter’s tape covered bucking bar just after bucking the lower tip rib rivet.

Riveting HS-706 (tip rib) to HS-702 (front spar). I think I could have squeezed these if I had unclecoed the skin a little, but I was feeling good about shooting them, and I'm not a fan of squeezing AD4- rivets since the "let's have fun squeezing and drilling out 9 rivets" fiasco this morning.

I like these rivets. They gave me no problems.

Done!

Next, I started setting the skin to front spar rivets. I shoudl elaborate on my technique a little here. I would remove a cleco, put in the AN426AD3-3.5 rivet, put some blue painters tape over the rivet, then shoot and buck it. The tape did wonders to protect the skin from any blemishes caused by the flush rivet set. I taught myself this trick after scratching the hell out of the practice kit. (note: I wish the practice kit had more AD4- rivets in it.) Anyway, these all look sufficient…

The first skin to spar rivets on the top.

I managed the rest of the HS702 (front spar) and HS-708 (aft middle rib) to skin rivets. There were 42 of them. On each side. I wrapped my bucking bar in blue painters tape to protect the skeleton from dings and scratches. Worked like a charm. I’ll replace all of the tape then next time I have a big rivet day.

I wrapped my bucking bar in tape. Here is the result after 113 rivets today. (Well, 124, I had to drill out 11 rivets.)

Here are some after shots. The HS is upside down, so even though this is the left HS, we are looking at the tip rib here.

All done. I may go back and see if there are any underdriven rivets in here. I was being rushed back into the house for dinner after I finished riveting.

Looking at HS-708 and the blind rivets holding it to HS-702 (front spar) and HS-707 (middle tip rib). It looks like the spar is scratched here, but it is really just a couple scuffs from my knuckles and the handle from the blind rivet puller.

More after pictures.

This is looking toward the center of the airplane (toward HS-405, aft inboard rib)

And again.

No closeups, because I didn’t clean off the skin yet, but still, it looks so nice. Also, I need to remember to stop dripping air tool oil all over my workbench.

Hooray for a riveted skin. It looks like it might fly one day.

After I got all the riveting done, I started peeling off the blue vinyl from the interior. The primer on the vinyl flaked off as I peeled, and it got everywhere. I don’t know how to prevent this, though, and after a quick sweep with the vacuum, it looked wonderful again. Before I close up, I’ll probably wipe off the unprimed aluminum with acetone or similar to make sure I have all the fingerprints (oils) off.