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Terrences Web Site
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Date: 8-6-2010
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Number of Hours: 1.00
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Manual Reference: N/A
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Brief Description: Confer with Zenair Re bend in R Spar at doubler
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Caleb responded to my inquiry about the kink caused by the doubler,
Essentially he said that he didn't think the doubler caused the kink in the bottom spar cap, and that I must have not installed the doubler correctly.
I decided to quantify the kink in the spar caps caused by the doubler, by comparing the spar cap angles to a straight edge.
With clamps, duct tape, and my hand, I positioned a good metal yard stick against the edge of the bottom and top spar cap angles, see photo 704.
Putting the yardstick against the edge of the top spar cap extruded angle, there is no discernible gap, Fig. 2.
I did the same thing on the bottom spar cap angle where the kink was clearly visible. Using a small rule, I measured the displacement in the bottom spar cap angle as 2-mm, see Fig. 1. A 2-mm displacement corresponds to an angle of ~179.5° vs. the expected 180°.
I have sent these photos to Caleb, again asking the question, ""Will the bend in the bottom spar cap weaken the spar significantly? If so, do I need to build a new spar?"
I await his response.
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Bend in bottom spar cap at doubler
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Extrusion keeps top spar cap straight
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Bottom spar cap angle is displaced 2-mm from linear
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