VAF Forums

VAF Forums (https://vansairforce.net/community/index.php)
-   My RV Build Project (https://vansairforce.net/community/forumdisplay.php?f=108)
-   -   RV-7 Z-EDD, Zimbabwe (https://vansairforce.net/community/showthread.php?t=109734)

Z-EDD 07-28-2015 01:51 PM

More tanks...
 
IMG_0752 by Ed Fleming, on Flickr
IMG_0752 by Ed Fleming, on Flickr

Tank riveting! Me on the left and my buddy Paul on the right bucking. We look like surgeons in our donated work shirts! anything to keep proseal from where it doesn't belong.

We found it easiest to rivet from the inboard rib out, always removing the next rib outboard to improve bucking access. The worst part about these tank sessions is they are long. From starting to clean the parts with MEK until the last tool is cleaned can be 4-5 hours.:(

IMG_0757 by Ed Fleming, on Flickr

First flares.

IMG_0760 by Ed Fleming, on Flickr

For a change of pace, riveting nut plates with Nas 1097 rivets for the first time.

IMG_0762 by Ed Fleming, on Flickr

Riveting inboard ribs.

Z-EDD 07-28-2015 02:00 PM

Closing the tanks
 
IMG_0766 by Ed Fleming, on Flickr
IMG_0769 by Ed Fleming, on Flickr

This is where the sender will mount.

IMG_0775 by Ed Fleming, on Flickr

Beads applied. I didn't fancy spooning proseal into freezer bags so we used George Orndorffs method of beading up the proseal with a notched popsicle stick. Seemed to work fine.

IMG_0777 by Ed Fleming, on Flickr

And its on! we nicknamed this assembly the porcupine!

IMG_0780 by Ed Fleming, on Flickr

Neat Fillet. That CAN'T leak!:p

Z-EDD 07-28-2015 02:10 PM

Last tank day
 
IMG_0786 by Ed Fleming, on Flickr
IMG_0789 by Ed Fleming, on Flickr

This is anti hangup mark 2, and I'm much happier with it.

IMG_0796 by Ed Fleming, on Flickr

At this point, ready to fit the second rear baffle, I was completely out of Proseal. I actually ran out of the Black catalyst first. However after buttering everything up I realised I had just enough mixed sealant to put on the access covers and senders, so we went ahead and did that too. It was a Looong session but I definitely did not want to wait for more sealant!

IMG_0803 by Ed Fleming, on Flickr

A few days later the leak tests passed!:D

rightrudder 07-29-2015 02:02 PM

Nice work, Ed! You're doing a very thorough and neat job. I went the QB route, so I hope those crafty Filipinos were on their game that week.

Z-EDD 07-30-2015 04:59 AM

Thanks Doug. I'll be thinking of you and other quick builders every time I open my deluxe fuel caps :D no doubt you will Spare me a thought still building when you set out on that first cross country.

Seriously, all the best with your build
IMG_0799 by Ed Fleming, on Flickr

ijustwannafly 08-22-2015 08:51 AM

nice job and great pics

Z-EDD 08-31-2015 08:48 AM

Leading edges
 
IMG_0818 by Ed Fleming, on Flickr

Right wing completely naked for the last time. Countersinking the spars was not nearly as bad as I thought it might be.

IMG_0816 by Ed Fleming, on Flickr

Finally got a TV in the garage, just in time for the Ashes!

IMG_0819 by Ed Fleming, on Flickr

Right wing Outboard leading edge is on. Managed all solid rivets without too much trouble, finally seemed to make friends with the double offset :D
IMG_0820 by Ed Fleming, on Flickr

Unfortunately the join with the tank is not perfect. I may shim this.

Z-EDD 08-31-2015 11:08 AM

Main Top skins
 
I prepped all of the main skins, edges and holes. Bottom skins were then stored away un dimpled. I went back to the system of removing strips of the blue vinyl. I had stopped doing this on the elevators and tanks since it took so much time and I intend to paint fully. However the scratching I got from the dimple die and also back riveting plate were just unacceptable. I know they will all be scuffed and painted eventually but I do want to build something that looks nice right now!

IMG_0817 by Ed Fleming, on Flickr

Here's the scarf joint. May have been able to get it a bit thinner but I was starting to get worried about accidentally bending a corner, so decided this is good enough. Should look ok, we shall see when its riveted.

IMG_0826 by Ed Fleming, on Flickr

Wing walk dimples. Over done if anything.

IMG_0822 by Ed Fleming, on Flickr

Started skin riveting on the right wing. I'm trying out back riveting using the 12 inch straight back rivet set from Cleaveland tool along with their back riveting bucking bar. My wife picked up the bucking instantly, its very easy, and the results are indeed very nice. Also impressed with the skin-tank joint. When it is just cleco'd it doesn't look great but the final product is great.

IMG_0823 by Ed Fleming, on Flickr

And this is from the inside. One or two of these shop heads are a little bit off centre but its a learning process. I found my 3x gun with a fairly high pressure, and give it a good hit to start with. I think this is going to work.

IMG_0832 by Ed Fleming, on Flickr

And the right wing is catching up!

Z-EDD 02-23-2016 12:21 PM

More skin riveting.
 
Its been way too long since my last update, but there is plenty to report. First up, the rest of the skin riveting.

IMG_0850 by Ed Fleming, on Flickr

Right wing all done and ready for squeezing along the rear spar. We persevered and back riveted all the rivets on this wing, but had to replace far too many rivets.

IMG_0850 by Ed Fleming, on Flickr

Another view.

IMG_0852 by Ed Fleming, on Flickr

When we got to the left wing we tried regular shooting and bucking for the first rib. It was so easy before we knew it we had slammed out almost the whole wing in a morning. I don't have a great comparison picture, but I really can't see a difference in the exterior surface quality. I so wanted back riveting to work out but in the end it was a waste of time.

IMG_0855 by Ed Fleming, on Flickr
IMG_0855 by Ed Fleming, on Flickr

Finally got the wings out of the stands!

Z-EDD 02-23-2016 12:58 PM

IMG_0869 by Ed Fleming, on Flickr

Wing stands and one leading edge cradle were recycled.

IMG_0841 by Ed Fleming, on Flickr

Standard pitot installation. This is the stainless steel tube sold extra by vans.

IMG_0840 by Ed Fleming, on Flickr

This is the new stall warning access cover I fabricated. I don't have a picture, but the original had an ugly gap all around. This is much nicer.

dwranda 02-24-2016 04:50 AM

I just finished my stall warning cover and was not happy with the fit either. Hadn't even considered making my own cover until I saw yours. Now I have to do it!!!! Thanks for the pic!!

Z-EDD 03-17-2016 01:28 PM

Flap braces
 
Moving on to the flap braces, these were a bit trickier than I thought. The problem is the flange which rivets to the rear spar is straight, but the section which attaches where the rear spar is doubled should be higher. hopefully you can see what I mean from the pictures. When you first cleco it in place this puts quite a kink in the lower flange where it rivets to the bottom skin. This required quite a bit of adjusting to get things straight. I got it to a point where it was straight with the skin clecoed on, but I found out later I needed to get it straight without the skin to help. Thats because when you drill the hinge you can't use clecos.

IMG_0897 by Ed Fleming, on Flickr
IMG_0898 by Ed Fleming, on Flickr

To do the countersinks in the lower flange I match drilled it to a piece of wood to guide the pilot.
IMG_0900 by Ed Fleming, on Flickr

Z-EDD 03-19-2016 01:50 AM

Quote:

Originally Posted by dwranda (Post 1056520)
I just finished my stall warning cover and was not happy with the fit either. Hadn't even considered making my own cover until I saw yours. Now I have to do it!!!! Thanks for the pic!!

Glad to be of help! Actually although these little diversions eat up time I find them very enjoyable and the results usually satisfying.

Z-EDD 03-19-2016 02:16 AM

Aileron mounts and gap seal
 
Moving on to the Aileron mounts. I primed the inner surfaces first before riveting them together and drilling to the wings. later I primed the outer surfaces. Only slight challenge here was some of the bearings were binding and I had to relieve the recesses a little. This is not apparent with the parts just clecoed together so I used C-clamps to put more pressure over the rivet holes and made adjustments until the binding stopped. Sorry no pictures of that particular process!
IMG_0863 by Ed Fleming, on Flickr

IMG_0879 by Ed Fleming, on Flickr
IMG_0879 by Ed Fleming, on Flickr

Don't forget that some of these rivets need to be countersunk!

Next up the gap seal. Minor issue here, there was some slight interference between the gap seal and one of the mounts so its a good plan to have them all clecoed on to fix something like this before priming.
IMG_0862 by Ed Fleming, on Flickr

Vinyl peeling is always a favourite job for smaller builders![url=http://s560.photobucket.com/user/edfleming/media/RV-7%20Build/IMG_0883.jpg.html]
IMG_0883 by Ed Fleming, on FlickrIMG_0883 by Ed Fleming, on Flickr

Z-EDD 03-19-2016 03:15 AM

Ailerons
 
Meanwhile I was working on the ailerons. After the familiar stiffener prep and riveting came the dreaded trailing edge bend. Now, when I did this on the elevators it did not go very well. Largely because I did not follow the instructions closely enough! When making my bending brake I did not have any sturdy 2x4s handy so decided to use some block board that I had laying around. I surmised that if I put enough hinges along the join it would hold up. Well it did not! The sheet wood just flexed under the strain and I ended up with an uneven bend that took a few hours to fix. Here are some pictures of the offending device-
IMG_0400 by Ed Fleming, on Flickr

IMG_0400 by Ed Fleming, on Flickr

So for the ailerons I wised up and went back to basics. I used sturdy wood that was left over from the wing stands and built more or less as per the instructions with the minor change in orientation as seen in George Orndorffs video. It worked a treat! Nice even bends with the correct radius. I didn't even use a piece of dowel inside the radius, it isn't needed. Just go for it as George does and its really simple. I did just one thing wrong. I made this brake just wide enough for the ailerons. But the flap skins could also do with a little extra bending so if I could do this again I'd make it wide enough for the flaps as well

IMG_0843 by Ed Fleming, on FlickrIMG_0843 by Ed Fleming, on Flickr

Z-EDD 03-19-2016 03:33 AM

More Ailerons
 
IMG_0847 by Ed Fleming, on Flickr
IMG_0847 by Ed Fleming, on FlickrIMG_0870 by Ed Fleming, on FlickrIMG_0870 by Ed Fleming, on FlickrIMG_0870 by Ed Fleming, on FlickrIMG_0870 by Ed Fleming, on Flickr

Z-EDD 03-19-2016 03:55 AM

Closing the ailerons
 
The only slight problems I had closing the ailerons were with the CS4-4 blind rivets. As you can see from the photo below I had a couple of the mandrels snap off way too high. I never really got to the bottom of this but switching to a different (cheap, locally bought:eek:) puller actually solved it and I had no more issues. Per the vans advice in section 5, these 2 were just cut off and ground flush. The other problem you can see in this photo is that the flush heads were being distorted during the pulling process. This was due to the hole on the bottom of the puller being too large. I actually could not find a hole of the correct size on either of my 2 pullers (one came with my tool kit from Cleaveland:() so ended up fabricating a spacer from .032 with the correct size hole drilled using my number size drill bit set. This worked a treat and the remaining rivets were fine.
IMG_0857 by Ed Fleming, on FlickrIMG_0857 by Ed Fleming, on Flickr

Z-EDD 03-19-2016 04:35 AM

Flaps
 
A common problem with the flaps is this gap between the aft flange of the ribs and the "rear spar" bent into the bottom skin. The instructions say that shims are acceptable but I felt there must be a slightly better way. I found it easy to adjust the flanges outward slightly as pictured below. Just another possibility.

IMG_0889 by Ed Fleming, on Flickr
IMG_0890 by Ed Fleming, on Flickr
IMG_0891 by Ed Fleming, on Flickr

It now fits much better but the friction of the flange against the rear spar can cause the bottom skin to sit away from the rib flange as in the picture below. If I had drilled it like this I would have felt really dumb but luckily I caught it!

IMG_0892 by Ed Fleming, on Flickr

Fabricating the two FL-706As. Pilot holes being drilled. Why do it twice:D

IMG_0893 by Ed Fleming, on Flickr

This is how I bent the FL-706Bs. Hard to see but the forward end is held securely in the vice and the wood blocks clamped on gave me the leverage to easily make the bend. Easy peasy.
IMG_0894 by Ed Fleming, on Flickr

Z-EDD 03-19-2016 05:04 AM

Flaps continued
 
The next slightly tricky part of the flaps is drilling the hinge. This would be trivial if it weren't for the fact that research showed many builders have edge distance problems down the road when drilling the flaps to the wings. Fore warned is fore-armed so I decided not to drill these exactly on the centre line, but rather gave myself just a couple of 32nds extra to work with. See in a couple of posts how this worked out.
IMG_0885 by Ed Fleming, on FlickrIMG_0885 by Ed Fleming, on FlickrIMG_0885 by Ed Fleming, on FlickrIMG_0885 by Ed Fleming, on Flickr

Z-EDD 03-19-2016 06:33 AM

Riveting the flaps
 
IMG_0198 by Ed Fleming, on Flickr

A piece of weather strip along the rear spar allowed me to rest the bucking bar on it. Easy to just hold it in place while riveting.

IMG_0208 by Ed Fleming, on Flickr

I weighted the flap down to a flat piece of board when riveting the ribs to the top skin.
IMG_0645 by Ed Fleming, on Flickr

Z-EDD 03-19-2016 07:21 AM

Mounting the flaps
 
This was one of those processes that gave me many sleepless nights and prompted much research. The conundrum of course is that the hinge can only be held in place by small clamps at each end. How do you keep the holes in the skin and flap brace aligned? My research turned up some funky methods involving keeper rivets, but also a few guys who just went ahead and drilled and had no alignment problems. After playing around with the fit, this is what I did too, and its so much easier and simpler than I had thought, much worry about nothing.

A couple of key points though.

1. As I mentioned a couple of posts back its important to get the lower flange of the flap brace properly adjusted so it is dead straight and the holes align with the skin with out needing clecos.

2. To help with the above I dimpled the bottom skins, so the dimples sit in the countersinks in the flap brace and the holes are kept in alignment without needing clecos.

I then clamped the flap in place, aligned the trailing edge, checked edge distance, and started drilling from outboard in, one hole at a time and clecoing every hole. ok, that makes it sound like it was really quick. Actually I clamped, checked, fussed, adjusted and repeated for a couple of days before committing steel to Aluminium, but it was eventually a non event and worked perfectly.

The below photo shows the min edge distance line passing through the bottom of each hole, so no problem there. It also illustrates that the edge distance is quite equally shared between the two hinge sections, vindicating what I did when drilling the hinge to the flap.
IMG_0199 by Ed Fleming, on FlickrIMG_0199 by Ed Fleming, on FlickrIMG_0205 by Ed Fleming, on FlickrIMG_0205 by Ed Fleming, on FlickrIMG_0207 by Ed Fleming, on Flickr

Z-EDD 04-23-2016 01:11 PM

Stupid mistake
 
You can even see the mark on the one I should have removed! Oh well. I was surprised to find some long pieces of hinge stock in the fuselage kit so I borrowed a length and redid this. I think the hinge stock is for the seat backs so I'll have to replace it before I get thereIMG_0192 by Ed Fleming, on Flickr

Z-EDD 04-23-2016 01:18 PM

Mason Wasp
 
While I was messing around with the flap mounting I noticed this guy had made his house on the rear spar. I guess this must be the African cousin of what you guys call a Mud dauber. We call him a Mason Wasp. They don't come too far indoors, but this end of the wings is near the garage door which I often leave open all day. I'll need to close off this end of the wings with paper or plastic, if the bottom skins had been on it would have been much harder to remove.
IMG_0631 by Ed Fleming, on Flickr

Z-EDD 04-23-2016 01:30 PM

Wiring fuel senders
 
One of the last big jobs I wanted to do before closing the wings was to wire the fuel senders. Mine are mounted through the rear baffles because I have one flop tube. I should have done this while the wings were in the stands but I was so eager to get them out and in the moveable cradle that I forgot. So they had to come out of the cradle one by one. It did give me a chance for some gratuitous shots of the wing top skins though!
IMG_0623 by Ed Fleming, on FlickrIMG_0623 by Ed Fleming, on FlickrIMG_0623 by Ed Fleming, on FlickrIMG_0623 by Ed Fleming, on FlickrIMG_0632 by Ed Fleming, on Flickr

Z-EDD 04-23-2016 01:40 PM

Leading edge/ Tank join shim
 
Also while the wings were out I wanted to fix this mismatch of the leading edge and tank skins. I had it on both wings in the same place. Not sure of the cause but it seems quite common. I had already done the right wing in the stand, but had forgotten the left. In this case it was just that one rivet immediately forward of the spar, so I drilled out the first 2 rivets and inserted an .016 shim. Did the trick, though you'll have to take my word since I forgot to take an "after" shot:roll eyes:IMG_0626 by Ed Fleming, on FlickrIMG_0627 by Ed Fleming, on FlickrIMG_0629 by Ed Fleming, on FlickrIMG_0630 by Ed Fleming, on Flickr

Z-EDD 04-23-2016 01:57 PM

Sender wiring
 
And finally I wired the senders. I had originally not intended to wire separate ground wires but some research suggested that this would be a good idea. Since my senders are so hard to get to, the last thing I need is some minor grounding issue disabling my senders, so I'm running a ground from one of the screws to the one of the bolts on the inboard Z bracket. This entailed a re-aquaintance with proseal when I replaced the screws.

Also I had wondered how to safely route the wires. Eventually an email to Vans confirmed that it would be ok to drill a 1/4 hole in the z brackets for a snap bushing.

Oh, also while I was at it I fixed up some scratches and misted some primer onto the baffle and end rib to protect them.
IMG_0640 by Ed Fleming, on Flickr
IMG_0640 by Ed Fleming, on Flickr
IMG_0653 by Ed Fleming, on Flickr
IMG_0653 by Ed Fleming, on Flickr

With the tanks fully bolted back in place, the final job before closing the wings was to work RTV silicone into the holes where the conduit passes through the ribs. This should help prevent the ribs from chafing through the conduit. And with that, I'm ready to close the wings!
IMG_0657 by Ed Fleming, on Flickr

Z-EDD 09-15-2016 07:16 AM

Finally updating the fuselage work!
 
Its been way too long since I updated this thread. Too much time spent building! Actually, is there such a thing? Anyway, lots of pictures, some mistakes, a few solutions, so here goes.

This was back in January, and concurrent with finishing off some of the wing details, I got started on the firewall. I still have not closed up the bottom of the wings. I got started on that and then the rear spar/ aileron bracket SB came out and that stopped me in my tracks with one inboard skin riveted on. Whilst I have no intention at the moment of drilling out rivets to apply that SB, it was a reminder that I still may need to get in there for some reason in the future, so there really is no rush to close them up now.

The firewall is straight forward. This shot shows how I held the 601P spacer in place for drilling, no rocket science here.

IMG_0194 by Ed Fleming, on Flickr

On to the riveting. I squeezed as many as I could. This requires leaving the steel brackets off so that you can slide the squeezer over the angles to reach the rivets.

IMG_0583 by Ed Fleming, on Flickr

On the 601J's I was able to squeeze these 3 rivets but that was it. Now, many guys back rivet the rest of the firewall. I'll be honest, I never even tried. I just shot and bucked all the rest of the rivets for two reasons. With the 3/32 rivets I saw them as excellent practice for potential riveting partners, so my wife and son shot those for experience. On the 1/8 flush rivets, I opted to shoot those myself for experience, since there are quite a few on the fuselage and I'd never shot any before. It was useful experience.
IMG_0584 by Ed Fleming, on Flickr

Now, regarding the 4 holes along the radius of the angle, these gave me problems on one side. I think that on one of these angles I did not get it clamped tightly to the adjacent stiffener angle, and the holes ended up just a tiny bit closer to the radius. When bucking these the bar ended up damaging the radius and I had to dress it out and re-prime. I don't have photos of this but I'm sure you can see how it might happen. These rivets would also be really hard to back rivet. I suggest taking care in drilling to get these as far from that radius as you can!

Z-EDD 09-15-2016 07:32 AM

F-704
 
On to the 704 bulkhead, I used my drill cup here to keep these holes nice and straight. I think these are the ones through the 704G spacer bars
IMG_0197 by Ed Fleming, on Flickr
Riveting these parts was the first time I tried riveting with the C-frame. All the time is spent setting up and getting things level. After that its literally a couple of minutes to set all these rivets. Ridiculously easy.
IMG_0195 by Ed Fleming, on Flickr

And beautiful. Unfortunately there just aren't that many parts on an RV where this technique makes much sense.
IMG_0193 by Ed Fleming, on Flickr

Fitting the control sticks was a fun diversion.
IMG_0185 by Ed Fleming, on Flickr

Heres how I squared and adjusted the ends of the brass bushings to get a Play-free fit.IMG_0186 by Ed Fleming, on Flickr

Z-EDD 09-15-2016 08:18 AM

706 Bulkhead
 
At this point I spent WAY too much time searching for all the parts of the 705 bulkhead. The problem was the 040 sheet that makes up the 705K, I just could not find it anywhere! eventually, weeks later I did find it, underneath a bunch of other stuff of course. Lesson learned, when you inventory, make a note of where the parts are stored, and then don't move them! It is VERY annoying to be stopped by something so simple. Anyway, as i contemplated ordering a new piece of sheet, I opted to continue with the remaining bulkheads, so on to the 706.

this is seemingly straight forward, yet I made my first major mistake of the fuselage here. These are the parts of the bell crank support structure clecoed together.

IMG_0588 by Ed Fleming, on Flickr

This was a minor problem. I had insufficient edge distance on the first 729C to 729B rivet hole. This could have been avoided if I had made 729B a little longer, or positioned further forward. It was a reminder that vans dimensions have zero tolerance. Accurate cutting and positioning is a must, there is no fat! I opted to make another 729C and position the hole at min edge distance rather than central as per the plans. in this photo you can see where the hole would have been originally.
IMG_0589 by Ed Fleming, on Flickr

And now for the really big mistake! The plans show two optional 5/8 holes through the bulkhead, one for the manual trim cable, the other for optional wiring. Since I am fitting manual trim at least one hole is non optional, and I opted to drill the other as well. Looking carefully at the plans, even if the hole is positioned perfectly, it will still result in less than min edge distance on all surrounding holes. Since this is per plans, it must be ok, but it seems important to get the hole position right so edge distance is shared equally.

It was at this point that I got too clever. I had read a number of build logs where guys had made a nice hole through 706B, only to lament that they now had to make corresponding cutouts in several other parts. Wouldn't it have been easier to have them all clecoed together and drilled in one go, they all wondered? Well thanks to the heads up, I was now ahead, or so I thought!

The problem is, when everything is clecoed together, there is no way to get the whole contraption into a drill press for nice accurate drilling, so I drilled a pilot hole, then went at it free hand. I did not pay attention to how things were going and it was a couple of minutes after finishing that I noticed to my horror that the hole was way off from where it should have been! The underlying parts, 730 and 729, whose edges bisect the hole, had cause the unibit to walk sideways and I had not noticed.

This is not good.
IMG_0593 by Ed Fleming, on Flickr

If I lived in the US, I would have been online ordering new parts, but that is a bit pricey for me. initially I used my dremel to open the hole out to where it should have been, then I went ahead and made the other hole with a lot more care. But the edge distance is still really bad on some of these holes.

IMG_0597 by Ed Fleming, on Flickr

So the email went off to vans, could I save this part, or were Fedex going to make some money out of me?

Z-EDD 09-15-2016 08:31 AM

The Fix
 
They came back pretty quick and the good news was, there was a fix. The bad news, it needed quite a bit of work and some .032. I thought about for a while and then decided to give it a try. Make a new F-730, only wider to reinforce the area. The pictures should be self explanatory.
IMG_0635 by Ed Fleming, on Flickr
IMG_0636 by Ed Fleming, on Flickr
IMG_0639 by Ed Fleming, on Flickr
IMG_0641 by Ed Fleming, on Flickr

In the end, I'm very happy with this. It really strengthens the whole area for very little weight gain.

Z-EDD 09-15-2016 11:20 AM

Aft Bulkheads
 
Most of the aft bulkheads don't warrant a photo, they are so simple. The next interesting one is 711. Here I am using my new favourite deburring tool. It starts out like the new one laying on top of the part. I picked it up at a store in Anchorage. No idea what its called but its made by 3m. I figured it might help get into those pesky relief notches. Well it did, but it really came into its own once all the bristles came off! Just a plastic disc with stubs around the edge, but it really works

IMG_0586 by Ed Fleming, on Flickr

This is how I positioned the 711C bars for drilling.

IMG_0592 by Ed Fleming, on Flickr

Here's a bunch of bulkhead components laid out for priming.
IMG_0596 by Ed Fleming, on Flickr

Z-EDD 09-15-2016 11:49 AM

Drilling the aft Fuse
 
I still had not started the F-705, but all of the aft bulkheads were done and my Buddy Kevin was in town for a couple of days. Kev lives in Dubai and is a serious wannabe builder. He also started his aviation career turning spanners in a hangar, so I knew he'd be super keen to help assemble the aft fuse.

IMG_0608 by Ed Fleming, on Flickr
IMG_0609 by Ed Fleming, on Flickr

Getting the 779 skin in place is a real bear. The bend of the skin is some of the problem, but here you can also see how the weld in the tail spring mount interferes with the mouse hole. I had to relieve that hole quite a bit to get the whole contraption to fit nicely.

Also note the holes drilled and countersunk for the keeper rivets through the WD-409. These are in completely the wrong place! The plans reference the dimension as 1 inch below a certain rivet. I mistakenly assumed this rivet must be the lowest one through F-712. Actually, the reference rivet is on the VS rear spar!!!
Ok, thats a dumb mistake by me, but how dumb for the plans to reference a part that will only be attached here in several years time?? How are you supposed to measure this?? Anyway, so far as I can tell, these rivets will be fine and will not be too close to the bolts, but how dumb!

Here's another shot of WD-409 to show how the weld on mine interferes with the cutout in F-712.
IMG_0599 by Ed Fleming, on Flickr
When I originally unpacked the tail spring mount I was surprised to find it was not powder coated and had already started to rust. I immediately cleaned and primed it, but when I got it down for drilling I could see the rust coming through the primer already. Better get this powder coatedIMG_0622 by Ed Fleming, on Flickr

Z-EDD 09-15-2016 12:01 PM

Drilling the aft fuse
 
Leveling was easy at the aft end

IMG_0613 by Ed Fleming, on Flickr

Took a little longer to set up at the front. The tape on the ruler was necessary because there was light reflecting off of it at my viewing angle!

IMG_0614 by Ed Fleming, on Flickr

I adjusted the 779 skin for a better fit. think it helped a bit.

IMG_0612 by Ed Fleming, on Flickr

While the skin was off I drilled the stringer to the side skins so that I could cleco along here.
IMG_0611 by Ed Fleming, on Flickr

Now that fits much better.IMG_0618 by Ed Fleming, on Flickr

Z-EDD 09-15-2016 12:19 PM

Drilling continued
 
This was a bit of a conundrum. What we have here is matched holes on the skin and bulkhead tab, but no hole in the stringer, which sits in between! If I just drilled this, any slight misalignment of that tab would result in an oval hole. I think this is a mistake by vans, one of those cases where the part really should not be pre-punched. I dealt with it by drilling all the other holes through the skin and stringer. Then I removed the skins from the bulkheads with stringers still clecoed to the skin, and drill the remaining holes. when they were back in place I could check for proper alignment and reamed the tabs to final size.
IMG_0610 by Ed Fleming, on Flickr

Drilling finally complete.

IMG_0617 by Ed Fleming, on Flickr

The inevitable disassembly. IMG_0619 by Ed Fleming, on Flickr
IMG_0620 by Ed Fleming, on Flickr

rightrudder 09-15-2016 09:34 PM

Lookin' good, Ed!! It's really starting to take form.

Z-EDD 09-18-2016 04:52 AM

Thanks Doug. I'm actually way further on than that, more updates to come!

Z-EDD 09-18-2016 05:56 AM

Riveting the tail cone.
 
While I was getting on with all the prep work I sent the Tail spring mount off for powder coating. Came back looking nice!

IMG_0711 by Ed Fleming, on Flickr

Here is how I set up for riveting the tail cone. F-712 is easy squeazy, just a couple to be shot and bucked on the lower forward flange.

IMG_0712 by Ed Fleming, on Flickr

F-711 is another story. The tail spring mount has to go in now, no way it can be inserted after riveting. But it really hampers access to those lower rivets. Ignore the odd sized bolts, they are just holding things in place. Bolts had to be removed for bucking access anyway.


IMG_0713 by Ed Fleming, on Flickr

Here you can see I gave up on the lower two holes and used pop rivets. The first tries bent over and mangled the dimples on both sides. Drilled out to 7/64 and cleaned up for MK-319s, no one will ever know. If I get some expert bucking help I could still go up to an oops rivet here but I'll probably leave well enough alone.

IMG_0715 by Ed Fleming, on Flickr

The forward flange was easier. not my best riveting but it will do.

Now here's a funny story! So I'm in bed with my wife one evening, and what better to do these days than update my build log and look through some photos. This was a good couple of months after the fact, and the tailcone is now fully riveted together as I took a look at the photo below. Hang on, what are those empty holes along the bottom of the bulkhead? should there be rivets in them? Quick check of the pdf plans reveals the obvious answer, of course there should!

It speaks volumes of how my wife is taking this whole process in her stride, as she barely looked up from her book when I muttered an expletive, shot out of bed, downstairs, and into the garage to take a look. I was still holding onto some vain hope that some magical riveting fairy might have visited and filled those holes since I took the picture. Unfortunately my flashlight revealed exactly what I had seen in the picture.

IMG_0720 by Ed Fleming, on Flickr

I can get between the 710 and 711 bulkhead with a rivet gun and offset, but bucking is going to be a real challenge. I'll need skilled help for that. What a dumb mistake, how did I miss those??

Z-EDD 09-18-2016 07:45 AM

Reassembly
 
Moving on, still blissfully unaware of my blunder, I reassembled the rest of the aft fuselage.
IMG_0723 by Ed Fleming, on Flickr
Looks just like it did a few weeks ago....

IMG_0727 by Ed Fleming, on Flickr
IMG_0728 by Ed Fleming, on Flickr
IMG_0738 by Ed Fleming, on Flickr
IMG_0739 by Ed Fleming, on Flickr

Canoe building time!

Z-EDD 09-18-2016 08:13 AM

Riveting the aft Fuse
 
After a few frustrating days without a riveting partner, my lovely wife gave some of her precious time to start shooting on the aft fuse. I had literally lost sleep wondering how these overlaps would come out. well here we go, this side great.

IMG_0761 by Ed Fleming, on Flickr

This side, not so much, bit of a gap right on the corner. Oh well, maybe some better preparation. Too late now.

IMG_0762 by Ed Fleming, on Flickr

There's really not much else out there that looks quite as good as riveted RV parts!

IMG_0765 by Ed Fleming, on Flickr

At about this point I was so close to finishing this that I succumbed to temptation and attempted to continue riveting the upper stringers solo. It was working fine, but about 10 rivets from the 706 bulkhead, on the left hand side, I lost control of the bucking bar and dented the skin. Sorry, I didn't take photos, it was too distressing! This mistake will stare me in the face every time I enter the left seat. It's not worth it, wait for riveting help!!

Z-EDD 09-29-2016 09:33 AM

Centre section
 
Moving on with the updates, here is the centre section coming together. The usual rib prep, not much more of that to do really. I did discover this great little tool from Dremel for getting into relief notches. Is called a detail abrasive brush.

IMG_0828 by Ed Fleming, on Flickr

I then began assembling the ribs and bulkheads

IMG_0742 by Ed Fleming, on Flickr
IMG_0743 by Ed Fleming, on Flickr
IMG_0744 by Ed Fleming, on Flickr

The instructions are a bit strange when it comes to fitting these outboard F-715 ribs. They have you fit and drill these after the rest of this structure is riveted. I could see no good reason for this, so I did them now. Seems to be ok so farIMG_0745 by Ed Fleming, on Flickr


All times are GMT -6. The time now is 02:28 AM.