Yes, yes, and yes. I did find a source for those long rivets, though, and that's what prompted me to make this thread. But Jay had an idea that i think will let me make the spun rivets without the complicated and rare tool that Hawker (and now Retrotec) used. Here are a picture of a typical fuselage joint from a Hawker Hind, I think, and also a drawing of the rivet spinning tool. It works like an old hand cranked drill press in principle; you turn the chuck and there is also a wheel to turn that increases the pressure on the work piece (I didn't make the drawing of the rivet tool, Retrotec emailed it to me a while back):Most joints need more than one rivet. Getting the spacers in tube is hard to do and must fit exact.
Pop rivets that long are hard to find.
That is genius. A fine thread bolt with a cone that slides up to the bolt head and then a special nut with the forming tool as part of it. You could let the bolt turn a little bit slower than the tool/nut and vary the pressure infinitely just like you can with the C-frame press but without building or tracking down a rare and hard to get tool or adapting an old drill press. The fuselage joint above is one of those hard points - the front cabane strut mount just behind the firewall (I think).When I looked at the first picture what I was thinking was a through bolt with two cones on either end. Put the assembly together, tighten the bold and flare the end just like a plumbing flare tool. If you have access to both ends you could do it with a large C frame press and a couple cones. Then there is the, how do you get the inner compression sleeve in and in place part of the whole equation. Again, that is an access thing but I am sure solvable with some sort of coat hanger or string thing.
I can't justify it with logic, but imagine a scaled down, open cockpit version of the pic below powered by a UL Power or similar engine and if the structure was almost a dead ringer for the Fury biplane or the Hurricane? My gut tells me that you are right about the extra work, though:It still looks like much fiddly labor to me. What was done for the war is probably too labor intensive today. I worked in a small airplane factory building a modern version of a ww2 design (Interstate L6). The tiny spacers and rivets and bits for each wing rib took several hours per rib to assemble. It was a nightmare compared with a one piece modern stamped rib.
Yeah; I think I just needed to hear a couple of people say that. It is an awfully complicated way to do something. And time consuming, I would guess.I can't see any reason to do this other than historical accuracy, so why not just use a blind rivet on each side of the joint? That way at least you know the joint strength allowables.
Yes.Actually the bushings were not likely used to reduce bearing stress, but more likely for an interference fit. Hawker aircraft didn't use any welding anywhere so it wasn't an option.