there is basically one way to get good at welding, weld more. I’m no expert with the tig but I can usually do ok, I can do ugly welds with the best of em, the trick is to never take pictures of those ones until you’ve buried them in layers of paint lol. I’m happy with the way the covering went over the cabane but on my next kitfox I will run a stringer from the tail post to the cabane truss, I think the transition will look a little better.
For whatever reason the above photos didn’t go up in any particular order, oh well, I’m sure everyone can figure out what’s going on. I guess the time flies, this is where I was at this time last year.
Been working on the firewall forward and it’s basically done now. With everything completed I will need to get the engine back on my test stand and verify the exhaust, intake and fuel system I came up with perform correctly.
3/4 .049 tube is what I used for the cabane truss. I didn’t “engineer” my landing gear but I did find a link on this site to an old article that gave some guidance on designing a cabane style gear, it explained how moving mounting points and angles varied the loads through the fuselage, I used what I learned in that article to design my gear. I haven’t seen any pictures of how the kitfox fuselage fails on a hard landing when equipped with a cabane gear but I suspect the lower longerons at the front mounting point will be pushed in towards each other.
Find some material the same thickness as the tubing you intend to weld and set up various types of weld joints with it and start welding them up, once you have that mastered you will be ready to start practicing on the tubing. Something like this makes excellent practice.
Pretty much everything TJay said. I think pure argon is going to make matters worse, C25 works well. Use the .025 wire, your machine should have a chart with setting guidelines, I have found them to be pretty much spot on.
Those are the best photos I’ve got of how I did my adapter, obviously there is more than one way to skin a cat, it’s great to see others figuring this out and going for it. The bottom picture is the clutch drum after my initial engine testing, no wear or clutch dust.
Remove the material at this location. The sealing Oring on the pto bearing will likely become exposed but your favorite gasket maker can take its place, a sealant will also need to be used on the pto bearing bolts since they go to oil. Your adapter plate should have a light press fit over the bearing, you will also need a step on the face of the adapter plate that will have a light press fit inside the bore of the gearbox.