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Old 10-01-2017, 04:50 AM   #276
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Finally got back to building whole parts today instead of making up kit pieces. Built rib #18, a -294 rib, the ribs which will border the inboard side of the aileron bay on each wing. Also finally tackled the second half of the spring bending jig with the giant welding tip. Pre-heating the metal made all the difference. I still have technique improvements to make, and they're not pretty welds, but they'll do what they need to, and I'm finally done with the welding.


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Old 10-12-2017, 02:44 AM   #277
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On to a new challenge tonight: the -292 rib stubs. These are just noses, which go in front of the top-wing fuel tanks, about mid-tank.

For previous ribs (which have all been full-length), I can count on the structure of the rib to give the top and bottom capstrips the right curvature. For these little tiny top and bottom capstrip stubs, I needed to give them a bit of curvature by their nature, rather than relying on mechanical means. Thus: my first wood-bending experiment!

I traced a slightly curved line from the rib nose (slightly more curved than I need for either piece of capstrip, but hopefully about right once springback is accounted for) on a hunk of scrap 2x4, and cut along it with the jigsaw. The capstrip stubs were soaked in hot water in an impromptu submersion setup (pictured below), then clamped in the jig with plastic wrap to keep them from leaching too much of their moisture into the 2x4. The plastic wrap is probably unnecessary, but I figured it'd be worth a try. The wrap is now open so the water can still evaporate. We'll see tomorrow how the bend turns out.


IMG02457.jpg   IMG02460.jpg   rib-292.png  
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Old 10-12-2017, 02:51 AM   #278
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Nice work!
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Old 10-12-2017, 03:16 AM   #279
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Thanks! I'll see tomorrow if I guessed right on the curvature. It seems unlikely I'll get it right on the first try, but I suppose you never know.
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Old 10-12-2017, 12:40 PM   #280
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Rather than trying to consistently soak/bend multiple strips to the same shape use two pieces of capstrip material that equal the thickness of what you need. Glue them together in your little jig. They will come out perfect every time
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Old 10-12-2017, 04:05 PM   #281
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Randy, if I've done it right, I won't have to do this particular operation again.

Are you saying that if (for instance) I need 1/4" capstrip, I should make a laminate of two pieces of 1/8" capstrip glued together, like I would for a laminated wingtip bow? That would certainly work, though it's overkill for what I'm doing -- I only need to make two of these -292 rib noses, and if my soak/bend operation turns out right, I've already got all the pieces I'll need for it. I'm not sure if the plans call for any lamination, but I've read about other folks' laminated wingtip bows with great interest.
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Old 10-12-2017, 06:09 PM   #282
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Sorry, thought you had a bunch of those to make and yes, that is what I was saying. I use this method to make kayak coaming lips using 1/8" thick Ash as it bends very easily and it works very well.
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Old 10-12-2017, 06:26 PM   #283
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Gotcha. At first I was locked into thinking about all my capstrip as being 1/4" square (since that's all I have at the moment), and couldn't figure out what you meant, thus my clarification question. I agree that that would be a good way to go for making a bunch of these. Less time involved in actively preparing the capstrip, and gluing is easier (or at least more familiar) than soaking.
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Old 10-12-2017, 09:05 PM   #284
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Looking good....and innovative, Ian!
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Old 10-17-2017, 04:48 AM   #285
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The bent pieces fit exactly like I had hoped they would. 0.8 hours later, I have my two required rib noses, and can cross the -292 ribs off the list. Pity it took me almost five days to actually get back in the shop and get them done.
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Old 10-17-2017, 05:01 AM   #286
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Looks great!


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