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Old 06-19-2017, 07:52 AM   #1
williamnear
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Default Wing Assembly

I'm in the process of restoring a Charger and specifically right now I'm working on a lower left wing. I'm wondering if anybody has ideas on how they assemble their wings and specifically putting in the 10 sweep. How did you jig it to ensure that all wing ribs maintained the 10 degree angle relative to the spars?
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Old 06-19-2017, 12:01 PM   #2
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Moved to its own thread.


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Old 06-19-2017, 06:03 PM   #3
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Sounds like a job for a lot of triangles of 2x4 cut to 100 degrees with clamping flats on the diagonal side. I'm very interested to hear the real method though, since I'll be running into this in the next year or so. Another way might be to cut long spacer blocks (again, 2x4s) to run alongside spars, with the ends cut at 10 degrees off square and of the right length to space ribs correctly.

JimC will hopefully chime in with his build experience.
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Old 06-19-2017, 06:24 PM   #4
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Are you doing just one wing or all? If just doing one, check all the rest for errors on sweep. Wine perfect wing at 10 deg and three at 8 deg will not match so well. Make sure you restore your airplane not just build to plan. All planes have errors that don't matter performance wise but will fit wise.
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Old 06-19-2017, 08:44 PM   #5
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Ian,

You should come to my shop soon to see the construction of a 6.5 deg. Skybolt upper. I can show you what I'm doing. Not sayn' it's the best way, but it's pretty accurate. And the methods are simple.

Tim.
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Old 06-19-2017, 09:31 PM   #6
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I'd like that. When I get my tailwheel situation sorted out, we should find a likely date.
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Old 06-20-2017, 12:13 AM   #7
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Fly into 7S9 and I'll meet you there.
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Old 06-20-2017, 10:22 AM   #8
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The lower left wing has evidence of multiple injuries including a ground loop (mea culpa). The plane has had several owners. The lower left wings spar has had several patches to it so I felt it would be a better idea to just rebuild the whole wing. I have all of the ribs needed as well as a complete set of Ken Brock fittings. A lower longeron appears to have a small bend in it. The skins around the cockpit have had multiple different modifications done to them so they're looking pretty ratty and need to be redone. If anybody has pictures of how they got the wing rib alignment, that would be a big help.
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Old 06-21-2017, 12:43 AM   #9
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Default Wings

For the Pitts I do it mathematically with Trig. On a plywood surface draw a line to represent the fuselage fittings if they are parallel to the fuselage centerline. From this line draw a line in front of the wing square to the first line. compute the 10 degree angle from Trig tables and mark the 10 degree reference. Draw a parallel line to represent the front surface of the front spar. Mark all your rib locations on front and rear spars and mark reference lines for outer surface of each rib. Make some clamping blocks from shelf brackets with some soft lumber screwed in place. Screw to table. Clamp the front spar with a couple of these blocks locating the spar parallel to the 10 degree mark. Likewise for the rear spars. Now slide each rib slightly away from the mark and apply glue. Slide rib back in line with the reference marks. If the ribs are spruce capstrip, some nails thru the vertical members into the spars.

I got this out of sequence, slide the ribs in place before clamping spars. make sure the inboard end of spars is lined up with reference marks. This will put you very close to what you want. When you install the drag/anti drag wires/struts you will make the final fine adjustment using trammel points on a long bar. You should also verify the sweep of the other lower wing referencing the table marks.
This is pretty much generic wood wing construction. I have used it on the Pitts and Starduster, also the Wittman Tailwind which is square-not swept. If your ribs are a tighy fit on the spars file 10 degree angles as appropriate on the spar openings. It helps to have a block of wood with a 10 degree angle to guide the file or sanding block.
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Old 06-21-2017, 12:57 AM   #10
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Trig works,

When I built my biplane, Nick D'Apuzzo worked out the numbers for my lower wing dihedral and my upper wing sweepback.

Bob
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Old 06-21-2017, 09:09 AM   #11
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Many thanks to all.


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