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[March 21, 2007]


I bend the skin in the bending brake tonight. The problem with using the bending brake is the hinges are spaced far apart, which leaves a slight bow in how the trim tab is bent. I took a pair of hand seamers and tapes two 12" metal rules to it. If you try to bend the trailing edge with just the hand seamers, it will leave dents where the ends of the seamers are. The metal rulers spread out the pressure and keep it from loading. Plus, with the vice grip seamers you can set a certain amount of squeeze and keep going.


Another shot of the seamers with the metal rulers taped to it.


When I put the spar on, I had the same issue with it overlapping the top about 1/32 to 3/64". When I clecoed the spar to the skin, the top of the skin bowed downward.


I bent the top flange of the spar downward, and the bottom spar flange upward to reduce this overlapping issue. I got it down to about 1/64" and finally had basically gotton rid of the downward bow in the top skin. I am calling this good enough in my book.

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Last Modified: November 11, 2017