« Posts tagged wings

Foam arrived, finally.

1.5 hours.

Cut and glassed in the emp tip foam inserts. This damned foam took nearly a month for Aircraft Spruce to get it to my house. It was backordered, then backordered again, and I finally got it today. They sent me a 2×4′ sheet of it too, and I’m pretty sure I ordered a lot less of it. Oh well.

This was easy enough, cut out some foam bits that fill the shape of the fiberglass tips, closing them off to outside elements. Mostly. I applied fiberglass and foam with the tips clecoed on so when the resin dries, I can pull them off and the tips will stay the shape they where when clecoed on. A couple of layups on the inside of the foam block and some micro filler frosting on the outside and those will be done. Then I don’t have to see the empennage again for a while.

Since I had some resin in the pot, I used up all the rest of my cut scraps to glass in the Archer VOR antenna in the wingtip, something I’d been planning to do for a long time but never got around to it. I did two layups on that, which should be enough to hold it in place, it’s not structural, just something to keep the antenna from flopping around in the wingtip. Another thing done.

Wing work wrapped up.

4 hours.

Finished the platenuts in the left wing. Other than a slightly messy install of the trailing edge platenut, the process went OK. However, for the first time, I regret not getting the platenut jig for the 8-series K1000 and K1100’s. I still have to figure out what to do about the wiring that’ll eventually go through the fuselage to the panel, but I there is no longer any interference with the control tubes (yeah, that was a big one, glad I caught it now). The wings are now back in the little garage for storage until they go to the airport.

So what next? The engine is supposed to be next, but I need the space and tech to fix a busted motor mount on my Buell, which is my daily transportation. However, I am dying to find out just how bad my motor is inside. Here’s hoping the guy who stored it for 10 years stored it properly and I don’t have a rusted camshaft.

Wing mating wrapup work

9 hours.

I’d say that only 7 hours was actual, tools-to-metal building. The rest of it was cleaning the shop, looking at plans, arranging parts, and various distractions. I’m also including Wednesday night, when David came over and helped me with the final wings-on/wings-off activities. We drilled the wing root fairings and the bottom skin, then pulled the wings off and moved the plane back into the guest house. Then I slacked off for two days while I took a break and watched bad movies.

Today, I got back on it and tried to get the wings into shape for more cold storage. Because I’m an idiot and didn’t attach the pitot and static fittings, the AN connectors slid up (down?) the tubing of the pitot and AOA into the pitot mast and got stuck there, with no way to wiggle them loose. I had to take the pitot tube off and shove the fittings down to the point where I could grab them and hook them up to the plastic tubing running down the wing. Of course, this demanded that I unclamp the plastic tubing from the Adel clamps attached to the bellcrank bracket to give it some slack. Finally, I got all that back together, ran my wires back down the conduit, and moved on.

I deburred and dimpled the wing root fairings, and deburred/dimpled/countersunk the wing roots. I also drilled all the holes for platenuts. I got all the platenuts done on the right wing, which was slow going on the forward edges because they went family style on the pro-seal. It also didn’t help that I drilled the fairing root holes a little too close to the root rib. I had to grind down some of the platenuts so they’d lay flat on the skin. But it’s all good, they’re all installed. I’ll do the left wing tomorrow, then they go back into the garage to await the trip to the airport. And some wiring. And some other stuff.

More wing rigging

As promised, a wider angle. All the bits flap like they’re supposed to.

Forgot about Saturday

8 hours.

Saturday was a pretty huge day in its own right. The night before, I’d cleaned up the workshop and put all the tools away so I could start making a fresh mess. I gloated over my handiwork in drilling the wing spars for a few minutes, then got going on the flap rigging. The flaps are attached at the trailing edge of the wing with a strip of piano hinge. The right side, the inboard edge of the flap rubbed against the fuselage, which didnt allow it to travel its full range of motion. So off it came, and I filed and scotchbrited off enough metal so that it did. However, in that sentence is contained about 4 or 5 iterations of trial, error, and scratching the crap out of the flap with the file until I got smart and put some tape around where I’d be working it. Eventually, it fit fine and was able to swing up and down, and in the ‘up’ position, the skin lay flat on the belly. The left side wasn’t a problem.

After that, it was time to reinstall the flap motor and rig the flaps. This is where the first setback occurred. The flap motor was one of the first things I did on the fuselage, so maybe I screwed it up, but there are many reports of the flap motor channel interfering with the canopy latch bar. Supposedly, they fixed this in the matched-hole kit, but I have a matched-hole kit and I’m telling you now, it ain’t fixed. What I had to do was put a 3/16″ spacer between the bushing block and the F-705 bulkhead to move the canopy latch bar forward enough so that it would clear the flap motor channel. I also had to change the rivets on the upper part of the flap motor channel to flush AN426 rivets. After this, I was able to see daylight between the latch bar and the channel. Of course, this also meant that the pushrod between the latch handle and the bar was now about 1/4″ too long. Put that on the list.

Then came the weird ceremony of drilling the flap pushrod holes. I”ll post pictures of this whole mess when I get the chance.

Wing spars drilled.

2.5 hours.

I win. Sweep and incidence are set, aft wing spar bolts are in. I made a drill guide from some 5/8″x1x4 bar stock (which I’ll have to replace, I think it goes with the wheels or brakes) featuring holes of 17/64″ and 5/16″ to guide the middle and final steps of drilling.

But about that stuck drill bit. As I suspected, I was able to drill just below my ‘relief well’ and pop the broken bit out from the front. Once I drilled it with the 5/16″ bit, all traces of nastiness went away and I have a nice round hole with little to no play on the AN5 bolt that goes in there. On VAF, there are a good amount of people who recommend using a .311 reamer to obtain a close-fit, precision hole. There are also a good amount of people who say that using the plans-recommended 5/16″ bit works fine too. I don’t have a .311 reamer. I don’t want to buy a .311 reamer, or any other kind of reamer right now, and I certainly don’t have time to wait for it. I think the drill guide did the job, and as long as that bolt is torqued and cotter-pinned, I seriously doubt the wing will fall off. If it should come to pass that the wing wiggles around that bolt, I’ll go up to the next size, use a reamer and a NAS close-tolerance bolt, and that’ll be the end of that. But there are plenty of RV’s flying with 5/16″ holes in their aft spars and they don’t seem to be having much of an issue.

I’ll have to take the wings off again to deburr the holes and shoot some primer on the raw metal where it was drilled or filed, as well as do the lineup for the wing root holes, but while they’re on, I’m going to do the flap pushrods, the rudder cable links, and maybe just for giggles, put the wingtips on to make sure everything lines up along the trailing edge.