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( 3 / 38 )I re-lined the jig to replace the wax paper with plastic wrap, then made another rib.
1 hr
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( 3 / 20 )I took a couple of ribs to the EAA 509 meeting. Several members looked them over and pronounced them good.
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( 3 / 20 )1 hr
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( 2.9 / 16 )1 hr
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( 3 / 21 )1 hr
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( 3 / 25 )1 hr
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( 3 / 25 )1 hr
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( 3 / 25 )1 hr
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( 3 / 30 )I tried breaking the extra "T". Those joints are TOUGH! Supporting the top of the "T" about 1/2" on each side of the gusset, I tried pulling on the stem of the "T". I was expecting a bending or shear failure in the top of the "T", but I couldn't grip the stem hard enough to apply the force needed to break it. I was able to pull with maybe 100-150 lbs of force. In the process, I crushed the end of the stem with the grips.
I cut off the crushed part and tried pushing on the stem in a vise with the top supported similarly to above. The top broke just outside the glue joint. Bending failure in the tension fibers. Just for kicks I pushed sideways on the T until it broke. Same result.
With the next test piece, I intend to devise a better way to apply tension to the stem - perhaps by gusseting another crosspiece to the bottom to form an "I". I also want to try the compression test again by supporting the top closer to the gusset to induce shear failure in the top or compression failure in the stem. If I can get a test that consistently fails the stem in compression or tension (not bending), then I can be reasonably sure that I am testing the joint to its fullest capacity.
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