Zenith Aircraft Builders and Flyers
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IMG_0939
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Comment by Timothy Aanerud on December 13, 2012 at 10:13am
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My fellow builder Jesse Hartman had the numbers on this spar. I know it took him two tries to get it right. Mine came out the first time because of his efforts. The sheet metal brake that I'm using a line 16.5mm from the edge on 0.025" sheet will bend up to 18mm. The brake bending edge is 1/4" or R3.2mm. Different metal thicknesses will bend differently.
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Comment by Ralph E. Wishart on December 13, 2012 at 2:29am
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Hey Tim, Where did you mark the bending lines on your spar? Did you measured the flanges from the edges or did you go with the full width web?
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